chore: update docker docs (#3623)

* fix: uv leftover docs

* fix: docker build failing

* chore: doc

* fix: remove old pytorch build

* fix: stop recommend flash-attn optional, let transformers pull

* fix: remove ring flash attention from image

* fix: quotes [skip ci]

* chore: naming [skip ci]

.github/CONTRIBUTING.md

@@ -31,7 +31,11 @@ PRs are **greatly welcome**!
 
 Please run below to setup env
 ```bash
-pip3 install -r requirements-dev.txt -r requirements-tests.txt
+# Install axolotl + dev and test dependencies
+export UV_TORCH_BACKEND=cu128  # or cu130
+uv venv --no-project --relocatable
+source .venv/bin/activate
+uv pip install --no-build-isolation -e '.[deepspeed]' --group dev --group test
 pre-commit install
 
 # test

.github/workflows/base.yml

@@ -30,14 +30,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - cuda: "128"
-            cuda_version: 12.8.1
-            cudnn_version: ""
-            python_version: "3.11"
-            pytorch: 2.9.0
-            torch_cuda_arch_list: "7.0 7.5 8.0 8.6 8.7 8.9 9.0+PTX"
-            dockerfile: "Dockerfile-base"
-            platforms: "linux/amd64,linux/arm64"
           - cuda: "128"
             cuda_version: 12.8.1
             cudnn_version: ""
@@ -168,14 +160,6 @@ jobs:
             torch_cuda_arch_list: "7.0 7.5 8.0 8.6 8.7 8.9 9.0+PTX"
             dockerfile: "Dockerfile-uv-base"
             platforms: "linux/amd64,linux/arm64"
-          - cuda: "128"
-            cuda_version: 12.8.1
-            cudnn_version: ""
-            python_version: "3.11"
-            pytorch: 2.9.0
-            torch_cuda_arch_list: "7.0 7.5 8.0 8.6 8.7 8.9 9.0+PTX"
-            dockerfile: "Dockerfile-uv-base"
-            platforms: "linux/amd64,linux/arm64"
           - cuda: "128"
             cuda_version: 12.8.1
             cudnn_version: ""

.github/workflows/lint.yml

@@ -6,7 +6,7 @@ on:
       types: [opened, synchronize, reopened, ready_for_review]
       paths:
        - '**.py'
-       - 'requirements.txt'
+       - 'pyproject.toml'
        - '.github/workflows/*.yml'
        - "*.[q]md"
        - "examples/**/*.y[a]?ml"

.github/workflows/main.yml

@@ -18,12 +18,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - cuda: 128
-            cuda_version: 12.8.1
-            python_version: "3.11"
-            pytorch: 2.9.0
-            axolotl_extras:
-            platforms: "linux/amd64,linux/arm64"
           - cuda: 128
             cuda_version: 12.8.1
             python_version: "3.11"
@@ -180,12 +174,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - cuda: 128
-            cuda_version: 12.8.1
-            python_version: "3.11"
-            pytorch: 2.9.0
-            axolotl_extras:
-            platforms: "linux/amd64,linux/arm64"
           - cuda: 128
             cuda_version: 12.8.1
             python_version: "3.11"

.github/workflows/multi-gpu-e2e.yml

@@ -3,17 +3,15 @@ name: docker-multigpu-tests-biweekly
 on:
   pull_request:
     paths:
-      - 'tests/e2e/multigpu/**.py'
+      - "tests/e2e/multigpu/**.py"
-      - 'requirements.txt'
+      - "pyproject.toml"
-      - 'setup.py'
+      - ".github/workflows/multi-gpu-e2e.yml"
-      - 'pyproject.toml'
+      - "scripts/cutcrossentropy_install.py"
-      - '.github/workflows/multi-gpu-e2e.yml'
+      - "src/axolotl/core/trainers/mixins/sequence_parallel.py"
-      - 'scripts/cutcrossentropy_install.py'
+      - "src/axolotl/utils/distributed.py"
-      - 'src/axolotl/core/trainers/mixins/sequence_parallel.py'
-      - 'src/axolotl/utils/distributed.py'
   workflow_dispatch:
   schedule:
-    - cron: '0 0 * * 1,4'  # Runs at 00:00 UTC every monday & thursday
+    - cron: "0 0 * * 1,4" # Runs at 00:00 UTC every monday & thursday
 
 # Cancel jobs on the same ref if a new one is triggered
 concurrency:
@@ -33,19 +31,19 @@ jobs:
       fail-fast: false
       matrix:
         include:
-#          - cuda: 129
+          #          - cuda: 129
-#            cuda_version: 12.9.1
+          #            cuda_version: 12.9.1
-#            python_version: "3.12"
+          #            python_version: "3.12"
-#            pytorch: 2.9.1
+          #            pytorch: 2.9.1
-#            axolotl_extras: "fbgemm-gpu"
+          #            axolotl_extras: "fbgemm-gpu"
-#            num_gpus: 2
+          #            num_gpus: 2
-#            dockerfile: "Dockerfile-uv.jinja"
+          #            dockerfile: "Dockerfile-uv.jinja"
           - cuda: 130
             cuda_version: 13.0.0
             python_version: "3.11"
             pytorch: 2.9.1
             axolotl_extras:
-#            axolotl_extras: fbgemm-gpu
+            #            axolotl_extras: fbgemm-gpu
             num_gpus: 2
           - cuda: 128
             cuda_version: 12.8.1
@@ -53,7 +51,6 @@ jobs:
             pytorch: 2.10.0
             axolotl_extras: "fbgemm-gpu"
             num_gpus: 2
-            dockerfile: "Dockerfile-uv.jinja"
     runs-on: [self-hosted, modal]
     timeout-minutes: 120
     steps:
@@ -75,7 +72,7 @@ jobs:
           echo "AXOLOTL_EXTRAS=${{ matrix.axolotl_extras}}" >> $GITHUB_ENV
           echo "CUDA=${{ matrix.cuda }}" >> $GITHUB_ENV
           echo "N_GPUS=${{ matrix.num_gpus }}" >> $GITHUB_ENV
-          echo "E2E_DOCKERFILE=${{ matrix.dockerfile || 'Dockerfile.jinja'}}" >> $GITHUB_ENV
+          echo "E2E_DOCKERFILE=${{ matrix.dockerfile || 'Dockerfile-uv.jinja'}}" >> $GITHUB_ENV
       - name: Run tests job on Modal
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

.github/workflows/pypi.yml

@@ -8,6 +8,9 @@ on:
 
 permissions: {}
 
+env:
+  UV_SYSTEM_PYTHON: "1"
+
 jobs:
   setup_release:
     name: Create Release
@@ -41,11 +44,15 @@ jobs:
         with:
           python-version: "3.11"
 
+      - name: Install uv
+        uses: astral-sh/setup-uv@v7
+
       - name: Install dependencies
         run: |
-          pip3 install wheel packaging==26.0
+          uv pip install wheel packaging
-          pip3 install --no-build-isolation -e .
+          uv pip install --no-build-isolation -e .
-          pip3 install -r requirements-dev.txt -r requirements-tests.txt
+          uv pip install black mypy pre-commit types-requests quartodoc jupyter blobfile tiktoken \
+            codecov codecov-cli pytest pytest-cov pytest-retry pytest-sugar pytest-xdist tbparse
 
       - name: Extract tag name
         id: tag

.github/workflows/tests-nightly.yml

@@ -2,15 +2,18 @@ name: Tests Nightly against upstream main
 on:
   workflow_dispatch:
   schedule:
-    - cron: '0 0 * * *'  # Runs at 00:00 UTC every day
+    - cron: "0 0 * * *" # Runs at 00:00 UTC every day
   pull_request:
     types: [opened, synchronize, reopened, ready_for_review]
     paths:
-      - '.github/workflows/tests-nightly.yml'
+      - ".github/workflows/tests-nightly.yml"
 
 permissions:
   contents: read
 
+env:
+  UV_SYSTEM_PYTHON: "1"
+
 jobs:
   pre-commit:
     name: pre-commit
@@ -20,7 +23,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: "3.11"
-          cache: 'pip' # caching pip dependencies
+          cache: "pip" # caching pip dependencies
       - uses: pre-commit/action@v3.0.1
         env:
           SKIP: no-commit-to-branch
@@ -43,7 +46,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python_version: ["3.12"]  # TODO include py3.14 once https://github.com/mistralai/mistral-common/pull/194 is merged
+        python_version: ["3.12"] # TODO include py3.14 once https://github.com/mistralai/mistral-common/pull/194 is merged
         pytorch_version: ["2.9.1", "2.10.0"]
     timeout-minutes: 20
 
@@ -61,36 +64,34 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python_version }}
-          cache: 'pip' # caching pip dependencies
 
-      - name: upgrade pip
+      - name: Install uv
-        run: |
+        uses: astral-sh/setup-uv@v7
-          pip3 install --upgrade pip
-          pip3 install --upgrade packaging==26.0 setuptools==78.1.1 wheel
 
       - name: Install PyTorch
         run: |
-          pip3 install torch==${{ matrix.pytorch_version }} torchvision
+          uv pip install torch==${{ matrix.pytorch_version }} torchvision
-
+          uv pip freeze | grep -E "^(torch|torchvision)==" > /tmp/torch-pin.txt
-      - name: Update requirements.txt
-        run: |
-          sed -i 's#^transformers.*#transformers @ git+https://github.com/huggingface/transformers.git@main#' requirements.txt
-          sed -i 's#^peft.*#peft @ git+https://github.com/huggingface/peft.git@main#' requirements.txt
-          sed -i 's#^accelerate.*#accelerate @ git+https://github.com/huggingface/accelerate.git@main#' requirements.txt
-          sed -i 's#^trl.*#trl @ git+https://github.com/huggingface/trl.git@main#' requirements.txt
-          sed -i 's#^datasets.*#datasets @ git+https://github.com/huggingface/datasets.git@main#' requirements.txt
 
       - name: Install dependencies
         run: |
-          pip3 show torch
+          uv pip install --no-build-isolation -e . --override /tmp/torch-pin.txt
-          pip3 install --no-build-isolation -U -e .
+          python scripts/cutcrossentropy_install.py --uv | sh
-          python scripts/unsloth_install.py | sh
+          uv pip install black mypy pre-commit types-requests quartodoc jupyter blobfile tiktoken \
-          python scripts/cutcrossentropy_install.py | sh
+            codecov codecov-cli pytest pytest-cov pytest-retry pytest-sugar pytest-xdist tbparse
-          pip3 install -r requirements-dev.txt -r requirements-tests.txt
+
+      - name: Override with nightly HF packages
+        run: |
+          uv pip install --no-deps \
+            "transformers @ git+https://github.com/huggingface/transformers.git@main" \
+            "peft @ git+https://github.com/huggingface/peft.git@main" \
+            "accelerate @ git+https://github.com/huggingface/accelerate.git@main" \
+            "trl @ git+https://github.com/huggingface/trl.git@main" \
+            "datasets @ git+https://github.com/huggingface/datasets.git@main"
 
       - name: Make sure PyTorch version wasn't clobbered
         run: |
-          python -c "import torch; assert '${{ matrix.pytorch_version }}' in torch.__version__"
+          python -c "import torch; assert '${{ matrix.pytorch_version }}' in torch.__version__, f'Expected torch ${{ matrix.pytorch_version }} but got {torch.__version__}'"
 
       - name: Ensure axolotl CLI was installed
         run: |
@@ -102,9 +103,6 @@ jobs:
           pytest -v --durations=10 tests/patched/
           pytest -v --durations=10 tests/cli/
 
-      - name: cleanup pip cache
-        run: |
-          find "$(pip cache dir)/http-v2" -type f -mtime +14 -exec rm {} \;
 
   docker-e2e-tests:
     if: github.repository_owner == 'axolotl-ai-cloud'
@@ -136,7 +134,6 @@ jobs:
             pytorch: 2.9.1
             num_gpus: 1
             axolotl_extras:
-            dockerfile: "Dockerfile-uv.jinja"
             nightly_build: "true"
     steps:
       - name: Checkout
@@ -157,7 +154,7 @@ jobs:
           echo "AXOLOTL_EXTRAS=${{ matrix.axolotl_extras}}" >> $GITHUB_ENV
           echo "CUDA=${{ matrix.cuda }}" >> $GITHUB_ENV
           echo "N_GPUS=${{ matrix.num_gpus }}" >> $GITHUB_ENV
-          echo "E2E_DOCKERFILE=${{ matrix.dockerfile || 'Dockerfile.jinja'}}" >> $GITHUB_ENV
+          echo "E2E_DOCKERFILE=${{ matrix.dockerfile || 'Dockerfile-uv.jinja'}}" >> $GITHUB_ENV
           echo "NIGHTLY_BUILD=${{ matrix.nightly_build }}" >> $GITHUB_ENV
       - name: Run tests job on Modal
         env:

.github/workflows/tests.yml

@@ -6,21 +6,19 @@ on:
     branches:
       - "main"
     paths:
-      - '**.py'
+      - "**.py"
-      - 'requirements.txt'
+      - "pyproject.toml"
-      - '.github/workflows/*.yml'
+      - ".github/workflows/*.yml"
-      - 'requirements-tests.txt'
+      - "cicd/cicd.sh"
-      - 'cicd/cicd.sh'
+      - "cicd/Dockerfile-uv.jinja"
-      - 'cicd/Dockerfile.jinja'
   pull_request:
-      types: [opened, synchronize, reopened, ready_for_review]
+    types: [opened, synchronize, reopened, ready_for_review]
-      paths:
+    paths:
-       - '**.py'
+      - "**.py"
-       - 'requirements.txt'
+      - "pyproject.toml"
-       - '.github/workflows/*.yml'
+      - ".github/workflows/*.yml"
-       - 'requirements-tests.txt'
+      - "cicd/cicd.sh"
-       - 'cicd/cicd.sh'
+      - "cicd/Dockerfile-uv.jinja"
-       - 'cicd/Dockerfile.jinja'
   workflow_dispatch:
 
 # Cancel jobs on the same ref if a new one is triggered
@@ -33,6 +31,7 @@ permissions:
 
 env:
   TRANSFORMERS_IS_CI: "yes"
+  UV_SYSTEM_PYTHON: "1"
 
 jobs:
   pre-commit:
@@ -44,7 +43,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: "3.11"
-          cache: 'pip' # caching pip dependencies
+          cache: "pip" # caching pip dependencies
       - uses: pre-commit/action@v3.0.1
         env:
           SKIP: no-commit-to-branch
@@ -94,32 +93,25 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python_version }}
-          cache: 'pip' # caching pip dependencies
 
-      - name: upgrade pip
+      - name: Install uv
-        run: |
+        uses: astral-sh/setup-uv@v7
-          pip3 install --upgrade pip
-          pip3 install --upgrade packaging==26.0 setuptools==75.8.0 wheel
 
       - name: Install PyTorch
         run: |
-          pip3 install --no-cache-dir torch==${{ matrix.pytorch_version }} torchvision
+          uv pip install torch==${{ matrix.pytorch_version }} torchvision
+          uv pip freeze | grep -E "^(torch|torchvision)==" > /tmp/torch-pin.txt
 
       - name: Install dependencies
         run: |
-          pip3 show torch
+          uv pip install --no-build-isolation -e . --override /tmp/torch-pin.txt
-          pip3 install --no-cache-dir --no-build-isolation -U -e .
+          python scripts/cutcrossentropy_install.py --uv | sh
-          python scripts/unsloth_install.py | sh
+          uv pip install black mypy pre-commit types-requests quartodoc jupyter blobfile tiktoken \
-          python scripts/cutcrossentropy_install.py | sh
+            codecov codecov-cli pytest pytest-cov pytest-retry pytest-sugar pytest-xdist tbparse
-          pip3 install -r requirements-dev.txt -r requirements-tests.txt
-
-      - name: cleanup pip cache
-        run: |
-          find "$(pip cache dir)/http-v2" -type f -mtime +14 -exec rm {} \;
 
       - name: Make sure PyTorch version wasn't clobbered
         run: |
-          python -c "import torch; assert '${{ matrix.pytorch_version }}' in torch.__version__"
+          python -c "import torch; assert '${{ matrix.pytorch_version }}' in torch.__version__, f'Expected torch ${{ matrix.pytorch_version }} but got {torch.__version__}'"
 
       - name: Ensure axolotl CLI was installed
         run: |
@@ -188,33 +180,27 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python_version }}
-          cache: 'pip' # caching pip dependencies
 
-      - name: upgrade pip
+      - name: Install uv
-        run: |
+        uses: astral-sh/setup-uv@v7
-          pip3 install --upgrade pip
-          pip3 install --upgrade packaging==26.0 setuptools==75.8.0 setuptools_scm build wheel psutil
 
       - name: Install PyTorch
         run: |
-          pip3 install --no-cache-dir torch==${{ matrix.pytorch_version }} torchvision
+          uv pip install torch==${{ matrix.pytorch_version }} torchvision
+          uv pip freeze | grep -E "^(torch|torchvision)==" > /tmp/torch-pin.txt
 
       - name: Install dependencies
         run: |
-          pip3 show torch
+          uv pip install packaging setuptools_scm build wheel psutil
           python -m build --no-isolation --sdist
-          pip3 install --no-cache-dir --no-build-isolation dist/axolotl*.tar.gz
+          uv pip install --no-build-isolation dist/axolotl*.tar.gz --override /tmp/torch-pin.txt
-          python scripts/unsloth_install.py | sh
+          python scripts/cutcrossentropy_install.py --uv | sh
-          python scripts/cutcrossentropy_install.py | sh
+          uv pip install black mypy pre-commit types-requests quartodoc jupyter blobfile tiktoken \
-          pip3 install -r requirements-dev.txt -r requirements-tests.txt
+            codecov codecov-cli pytest pytest-cov pytest-retry pytest-sugar pytest-xdist tbparse
-
-      - name: cleanup pip cache
-        run: |
-          find "$(pip cache dir)/http-v2" -type f -mtime +14 -exec rm {} \;
 
       - name: Make sure PyTorch version wasn't clobbered
         run: |
-          python -c "import torch; assert '${{ matrix.pytorch_version }}' in torch.__version__"
+          python -c "import torch; assert '${{ matrix.pytorch_version }}' in torch.__version__, f'Expected torch ${{ matrix.pytorch_version }} but got {torch.__version__}'"
 
       - name: Ensure axolotl CLI was installed
         run: |
@@ -291,7 +277,6 @@ jobs:
             pytorch: 2.9.1
             num_gpus: 1
             axolotl_extras:
-            dockerfile: "Dockerfile-uv.jinja"
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -312,7 +297,7 @@ jobs:
           echo "CUDA=${{ matrix.cuda }}" >> $GITHUB_ENV
           echo "MODAL_IMAGE_BUILDER_VERSION=2024.10" >> $GITHUB_ENV
           echo "N_GPUS=${{ matrix.num_gpus }}" >> $GITHUB_ENV
-          echo "E2E_DOCKERFILE=${{ matrix.dockerfile || 'Dockerfile.jinja'}}" >> $GITHUB_ENV
+          echo "E2E_DOCKERFILE=${{ matrix.dockerfile || 'Dockerfile-uv.jinja'}}" >> $GITHUB_ENV
       - name: Run tests job on Modal
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
@@ -374,7 +359,7 @@ jobs:
           echo "MODAL_IMAGE_BUILDER_VERSION=2024.10" >> $GITHUB_ENV
           echo "N_GPUS=${{ matrix.num_gpus }}" >> $GITHUB_ENV
           echo "GPU_TYPE=${{ matrix.gpu_type || 'L40S'}}" >> $GITHUB_ENV
-          echo "E2E_DOCKERFILE=${{ matrix.dockerfile || 'Dockerfile.jinja'}}" >> $GITHUB_ENV
+          echo "E2E_DOCKERFILE=${{ matrix.dockerfile || 'Dockerfile-uv.jinja'}}" >> $GITHUB_ENV
       - name: Run tests job on Modal
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

AGENTS.md

@@ -26,7 +26,7 @@ axolotl config-schema                  # Dump config JSON schema
 | Method | Config Key | When to Use |
 |--------|-----------|-------------|
 | SFT | *(default)* | Input-output pairs, instruction tuning |
-| DPO/IPO | `rl: dpo` / `rl: ipo` | Paired preference data (chosen vs rejected) |
+| DPO/IPO | `rl: dpo` / `rl: dpo, dpo_loss_type: ["ipo"]` | Paired preference data (chosen vs rejected) |
 | KTO | `rl: kto` | Unpaired binary preference labels |
 | ORPO | `rl: orpo` | Single-stage alignment, no ref model |
 | GRPO | `rl: grpo` | RL with verifiable reward functions (math, code) |

MANIFEST.in

@@ -1,7 +1,6 @@
-include requirements.txt
 include README.md
 include LICENSE
-include src/setuptools_axolotl_dynamic_dependencies.py
+include VERSION
 include src/axolotl/utils/chat_templates/templates/*.jinja
 include AGENTS.md
 recursive-include docs/agents *.md

README.md

@@ -95,14 +95,11 @@ Features:
 
 ### Installation
 
-#### Using uv (recommended)
-
 ```bash
-# install uv if you don't already have it installed
+# install uv if you don't already have it installed (restart shell after)
 curl -LsSf https://astral.sh/uv/install.sh | sh
-source $HOME/.local/bin/env
 
-# CUDA 12.8.1 tends to have better package compatibility
+# change depending on system
 export UV_TORCH_BACKEND=cu128
 
 # create a new virtual environment
@@ -112,23 +109,6 @@ source .venv/bin/activate
 uv pip install torch==2.10.0 torchvision
 uv pip install --no-build-isolation axolotl[deepspeed]
 
-# recommended - install cut-cross-entropy
-uv pip install "cut-cross-entropy[transformers] @ git+https://github.com/axolotl-ai-cloud/ml-cross-entropy.git@main"
-
-# (optional) - prefetch flash-attn2 and causal-conv1d kernels
-uv run --python 3.12 python -c "from kernels import get_kernel; get_kernel('kernels-community/flash-attn2'); get_kernel('kernels-community/causal-conv1d')"
-
-# Download example axolotl configs, deepspeed configs
-axolotl fetch examples
-axolotl fetch deepspeed_configs  # OPTIONAL
-```
-
-#### Using pip
-
-```bash
-pip3 install -U packaging==26.0 setuptools==75.8.0 wheel ninja
-pip3 install --no-build-isolation axolotl[flash-attn,deepspeed]
-
 # Download example axolotl configs, deepspeed configs
 axolotl fetch examples
 axolotl fetch deepspeed_configs  # OPTIONAL
@@ -138,7 +118,7 @@ axolotl fetch deepspeed_configs  # OPTIONAL
 
 Installing with Docker can be less error prone than installing in your own environment.
 ```bash
-docker run --gpus '"all"' --rm -it axolotlai/axolotl:main-latest
+docker run --gpus '"all"' --ipc=host --rm -it axolotlai/axolotl:main-latest
 ```
 
 Other installation approaches are described [here](https://docs.axolotl.ai/docs/installation.html).

VERSION

@@ -1 +1 @@
-0.16.0.dev0
+0.16.2.dev0

_quarto.yml

@@ -134,7 +134,6 @@ quartodoc:
         - monkeypatch.stablelm_attn_hijack_flash
         - monkeypatch.trainer_fsdp_optim
         - monkeypatch.transformers_fa_utils
-        - monkeypatch.unsloth_
         - monkeypatch.data.batch_dataset_fetcher
         - monkeypatch.mixtral
         - monkeypatch.gradient_checkpointing.offload_cpu
@@ -327,7 +326,6 @@ website:
         - section: "Advanced Features"
           contents:
             - docs/fsdp_qlora.qmd
-            - docs/unsloth.qmd
             - docs/torchao.qmd
             - docs/custom_integrations.qmd
             - docs/sequence_parallelism.qmd

cicd/Dockerfile-uv.jinja

@@ -22,15 +22,6 @@ WORKDIR /workspace/axolotl
 RUN git fetch origin +$GITHUB_REF && \
     git checkout FETCH_HEAD
 
-# If AXOLOTL_EXTRAS is set, append it in brackets
-RUN if [ "$NIGHTLY_BUILD" = "true" ] ; then \
-        sed -i 's#^transformers.*#transformers @ git+https://github.com/huggingface/transformers.git@main#' requirements.txt; \
-        sed -i 's#^peft.*#peft @ git+https://github.com/huggingface/peft.git@main#' requirements.txt; \
-        sed -i 's#^accelerate.*#accelerate @ git+https://github.com/huggingface/accelerate.git@main#' requirements.txt; \
-        sed -i 's#^trl.*#trl @ git+https://github.com/huggingface/trl.git@main#' requirements.txt; \
-        sed -i 's#^datasets.*#datasets @ git+https://github.com/huggingface/datasets.git@main#' requirements.txt; \
-    fi
-
 RUN uv pip install packaging==26.0 setuptools==78.1.1
 RUN uv pip install torchvision
 RUN uv pip uninstall causal_conv1d
@@ -40,11 +31,21 @@ RUN if [ "$AXOLOTL_EXTRAS" != "" ] ; then \
         uv pip install --no-build-isolation -e .[deepspeed,flash-attn,ring-flash-attn,optimizers,ray] $AXOLOTL_ARGS; \
     fi
 
-RUN python scripts/unsloth_install.py --uv | sh
+# Override with nightly HF packages for nightly builds
+RUN if [ "$NIGHTLY_BUILD" = "true" ] ; then \
+        uv pip install --no-deps \
+            "transformers @ git+https://github.com/huggingface/transformers.git@main" \
+            "peft @ git+https://github.com/huggingface/peft.git@main" \
+            "accelerate @ git+https://github.com/huggingface/accelerate.git@main" \
+            "trl @ git+https://github.com/huggingface/trl.git@main" \
+            "datasets @ git+https://github.com/huggingface/datasets.git@main"; \
+    fi
+
 RUN python scripts/cutcrossentropy_install.py --uv | sh
 
 # So we can test the Docker image
-RUN uv pip install -r requirements-dev.txt -r requirements-tests.txt
+RUN uv pip install black mypy pre-commit types-requests quartodoc jupyter blobfile tiktoken \
+    codecov codecov-cli pytest pytest-cov pytest-retry pytest-sugar pytest-xdist tbparse
 
 # fix so that git fetch/pull from remote works
 RUN git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*" && \

cicd/Dockerfile.jinja

@@ -1,54 +0,0 @@
-FROM axolotlai/axolotl-base:{{ BASE_TAG }}
-
-ENV TORCH_CUDA_ARCH_LIST="7.0 7.5 8.0 8.6 8.7 8.9 9.0+PTX"
-ENV AXOLOTL_EXTRAS="{{ AXOLOTL_EXTRAS }}"
-ENV AXOLOTL_ARGS="{{ AXOLOTL_ARGS }}"
-ENV CUDA="{{ CUDA }}"
-ENV PYTORCH_VERSION="{{ PYTORCH_VERSION }}"
-ENV GITHUB_REF="{{ GITHUB_REF }}"
-ENV GITHUB_SHA="{{ GITHUB_SHA }}"
-ENV NIGHTLY_BUILD="{{ NIGHTLY_BUILD }}"
-ENV HF_HOME="{{ HF_HOME }}"
-ENV AXOLOTL_DATASET_NUM_PROC="8"
-
-RUN apt-get update && \
-    apt-get install -y --allow-change-held-packages vim curl nano zstd libnccl2 libnccl-dev ibverbs-providers ibverbs-utils infiniband-diags librdmacm-dev librdmacm1 rdmacm-utils slurm-wlm
-
-WORKDIR /workspace
-
-RUN git clone --depth=1 https://github.com/axolotl-ai-cloud/axolotl.git
-
-WORKDIR /workspace/axolotl
-
-RUN git fetch origin +$GITHUB_REF && \
-    git checkout FETCH_HEAD
-
-# If AXOLOTL_EXTRAS is set, append it in brackets
-RUN if [ "$NIGHTLY_BUILD" = "true" ] ; then \
-        sed -i 's#^transformers.*#transformers @ git+https://github.com/huggingface/transformers.git@main#' requirements.txt; \
-        sed -i 's#^peft.*#peft @ git+https://github.com/huggingface/peft.git@main#' requirements.txt; \
-        sed -i 's#^accelerate.*#accelerate @ git+https://github.com/huggingface/accelerate.git@main#' requirements.txt; \
-        sed -i 's#^trl.*#trl @ git+https://github.com/huggingface/trl.git@main#' requirements.txt; \
-        sed -i 's#^datasets.*#datasets @ git+https://github.com/huggingface/datasets.git@main#' requirements.txt; \
-    fi
-
-RUN pip install packaging==26.0 setuptools==78.1.1 psutil
-RUN pip uninstall -y causal_conv1d
-RUN if [ "$AXOLOTL_EXTRAS" != "" ] ; then \
-        pip install --no-build-isolation -e .[deepspeed,flash-attn,ring-flash-attn,optimizers,ray,$AXOLOTL_EXTRAS] $AXOLOTL_ARGS; \
-    else \
-        pip install --no-build-isolation -e .[deepspeed,flash-attn,ring-flash-attn,optimizers,ray] $AXOLOTL_ARGS; \
-    fi
-
-RUN python scripts/unsloth_install.py | sh
-RUN python scripts/cutcrossentropy_install.py | sh
-
-# So we can test the Docker image
-RUN pip install -r requirements-dev.txt -r requirements-tests.txt
-
-# fix so that git fetch/pull from remote works
-RUN git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*" && \
-    git config --get remote.origin.fetch
-
-# helper for huggingface-login cli
-RUN git config --global credential.helper store

cicd/cicd.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -e
 
-python -c "import torch; assert '$PYTORCH_VERSION' in torch.__version__"
+python -c "import torch; assert '$PYTORCH_VERSION' in torch.__version__, f'Expected torch $PYTORCH_VERSION but got {torch.__version__}'"
 
 set -o pipefail
 for i in 1 2 3; do

cicd/multigpu.py

@@ -17,7 +17,7 @@ template_loader = jinja2.FileSystemLoader(searchpath=cicd_path)
 template_env = jinja2.Environment(
     loader=template_loader, autoescape=select_autoescape()
 )
-dockerfile = os.environ.get("E2E_DOCKERFILE", "Dockerfile.jinja")
+dockerfile = os.environ.get("E2E_DOCKERFILE", "Dockerfile-uv.jinja")
 df_template = template_env.get_template(dockerfile)
 
 df_args = {

cicd/single_gpu.py

@@ -16,7 +16,7 @@ template_loader = jinja2.FileSystemLoader(searchpath=cicd_path)
 template_env = jinja2.Environment(
     loader=template_loader, autoescape=select_autoescape()
 )
-dockerfile = os.environ.get("E2E_DOCKERFILE", "Dockerfile.jinja")
+dockerfile = os.environ.get("E2E_DOCKERFILE", "Dockerfile-uv.jinja")
 df_template = template_env.get_template(dockerfile)
 
 df_args = {

docker/Dockerfile

@@ -24,15 +24,15 @@ WORKDIR /workspace/axolotl
 # If AXOLOTL_EXTRAS is set, append it in brackets; don't install deepspeed with arm64
 RUN pip uninstall -y causal_conv1d
 RUN if [ "$TARGETARCH" = "arm64" ]; then \
-        BASE_EXTRAS="flash-attn,ring-flash-attn,optimizers,ray"; \
+        BASE_EXTRAS="optimizers,ray"; \
     else \
-        BASE_EXTRAS="deepspeed,flash-attn,ring-flash-attn,optimizers,ray"; \
+        BASE_EXTRAS="deepspeed,optimizers,ray"; \
     fi && \
     if [ "$AXOLOTL_EXTRAS" != "" ]; then \
         pip install --no-build-isolation -e .[$BASE_EXTRAS,$AXOLOTL_EXTRAS] $AXOLOTL_ARGS; \
     else \
         pip install --no-build-isolation -e .[$BASE_EXTRAS] $AXOLOTL_ARGS; \
-    fi && \    python scripts/unsloth_install.py | sh && \
+    fi && \
     python scripts/cutcrossentropy_install.py | sh && \
     pip install pytest && \
     pip cache purge

docker/Dockerfile-base

@@ -58,19 +58,3 @@ RUN git lfs install --skip-repo && \
     # The base image ships with `pydantic==1.8.2` which is not working
     pip3 install -U --no-cache-dir pydantic==1.10.10 && \
     pip3 cache purge
-
-# Map Python version (e.g., 3.12 -> cp312)
-RUN PYTHON_CP="cp$(echo $PYTHON_VERSION | tr -d '.')" && \
-    # Map PyTorch version (e.g., 2.9.1 -> torch2.9, 2.10.0 -> torch2.10)
-    TORCH_TAG="torch$(echo $PYTORCH_VERSION | grep -oP '^\d+\.\d+')" && \
-    # Map architecture
-    case "$TARGETARCH" in \
-        amd64) ARCH_TAG="x86_64" ;; \
-        arm64) ARCH_TAG="aarch64" ;; \
-        *) echo "Unsupported architecture: $TARGETARCH"; exit 1 ;; \
-    esac && \
-    WHL_VERSION="v0.7.16" && \
-    WHL_FILE="flash_attn-2.8.3+cu${CUDA}${TORCH_TAG}-${PYTHON_CP}-${PYTHON_CP}-linux_${ARCH_TAG}.whl" && \
-    wget -nv "https://github.com/mjun0812/flash-attention-prebuild-wheels/releases/download/${WHL_VERSION}/${WHL_FILE}" && \
-    pip3 install --no-cache-dir "${WHL_FILE}" && \
-    rm "${WHL_FILE}"

docker/Dockerfile-tests

@@ -24,9 +24,9 @@ RUN git fetch origin +$GITHUB_REF && \
 
 # If AXOLOTL_EXTRAS is set, append it in brackets
 RUN if [ "$AXOLOTL_EXTRAS" != "" ] ; then \
-        pip install --no-build-isolation -e .[deepspeed,flash-attn,mamba-ssm,$AXOLOTL_EXTRAS] $AXOLOTL_ARGS; \
+        pip install --no-build-isolation -e .[deepspeed,mamba-ssm,$AXOLOTL_EXTRAS] $AXOLOTL_ARGS; \
     else \
-        pip install --no-build-isolation -e .[deepspeed,flash-attn,mamba-ssm] $AXOLOTL_ARGS; \
+        pip install --no-build-isolation -e .[deepspeed,mamba-ssm] $AXOLOTL_ARGS; \
     fi
 
 # So we can test the Docker image

docker/Dockerfile-uv

@@ -24,16 +24,15 @@ WORKDIR /workspace/axolotl
 # If AXOLOTL_EXTRAS is set, append it in brackets; don't install deepspeed with arm64
 RUN uv pip uninstall causal_conv1d
 RUN if [ "$TARGETARCH" = "arm64" ]; then \
-        BASE_EXTRAS="flash-attn,ring-flash-attn,optimizers,ray"; \
+        BASE_EXTRAS="optimizers,ray"; \
     else \
-        BASE_EXTRAS="deepspeed,flash-attn,ring-flash-attn,optimizers,ray"; \
+        BASE_EXTRAS="deepspeed,optimizers,ray"; \
     fi && \
     if [ "$AXOLOTL_EXTRAS" != "" ]; then \
         uv pip install --no-build-isolation -e .[$BASE_EXTRAS,$AXOLOTL_EXTRAS] $AXOLOTL_ARGS; \
     else \
         uv pip install --no-build-isolation -e .[$BASE_EXTRAS] $AXOLOTL_ARGS; \
     fi && \
-    python scripts/unsloth_install.py --uv | sh && \
     python scripts/cutcrossentropy_install.py --uv | sh && \
     uv pip install pytest && \
     uv cache clean

docker/Dockerfile-uv-base

@@ -38,20 +38,3 @@ RUN uv pip install packaging setuptools wheel psutil \
 RUN if [ "$TARGETARCH" = "amd64" ]; then \
         MAMBA_SKIP_CUDA_BUILD=TRUE CAUSAL_CONV1D_SKIP_CUDA_BUILD=TRUE uv pip install --no-build-isolation mamba_ssm causal_conv1d; \
     fi
-
-# Map Python version (e.g., 3.12 -> cp312)
-RUN PYTHON_CP="cp$(echo $PYTHON_VERSION | tr -d '.')" && \
-    # Map PyTorch version (e.g., 2.9.1 -> torch2.9, 2.10.0 -> torch2.10)
-    TORCH_TAG="torch$(echo $PYTORCH_VERSION | grep -oP '^\d+\.\d+')" && \
-    LINUX_TAG="manylinux_" && \
-    # Map architecture
-    case "$TARGETARCH" in \
-        amd64) ARCH_TAG="2_24_x86_64.manylinux_2_28_x86_64" ;; \
-        arm64) ARCH_TAG="2_34_aarch64" ;; \
-        *) echo "Unsupported architecture: $TARGETARCH"; exit 1 ;; \
-    esac && \
-    WHL_VERSION="v0.7.16" && \
-    WHL_FILE="flash_attn-2.8.3+cu${CUDA}${TORCH_TAG}-${PYTHON_CP}-${PYTHON_CP}-${LINUX_TAG}${ARCH_TAG}.whl" && \
-    wget -nv "https://github.com/mjun0812/flash-attention-prebuild-wheels/releases/download/${WHL_VERSION}/${WHL_FILE}" && \
-    uv pip install --no-cache-dir "${WHL_FILE}" && \
-    rm "${WHL_FILE}"

docs/agents/preference_tuning.md

@@ -38,7 +38,7 @@ No vLLM server needed (unlike GRPO). Offline RL with pre-collected preference da
 
 1. Paired preference data (chosen + rejected)?
    - Default → `rl: dpo`
-   - Overfitting → `rl: ipo`
+   - Overfitting → `rl: dpo, dpo_loss_type: ["ipo"]`
    - VRAM-limited → `rl: orpo` (no ref model)
    - Length-sensitive → `rl: simpo` (no ref model)
 2. Only binary labels (good/bad)? → `rl: kto`

docs/debugging.qmd

@@ -76,8 +76,10 @@ datasets:
 Make sure you have an [editable install](https://setuptools.pypa.io/en/latest/userguide/development_mode.html) of Axolotl, which ensures that changes you make to the code are reflected at runtime.  Run the following commands from the root of this project:
 
 ```bash
-pip3 install packaging
+export UV_TORCH_BACKEND=cu128  # or cu130
-pip3 install --no-build-isolation -e '.[flash-attn,deepspeed]'
+uv venv --no-project --relocatable
+source .venv/bin/activate
+uv pip install --no-build-isolation -e '.[deepspeed]' --group dev --group test
 ```
 
 #### Remote Hosts
@@ -208,17 +210,18 @@ cd axolotl
 Next, run the desired docker image and mount the current directory. Below is a docker command you can run to do this:[^2]
 
 ```bash
-docker run --privileged --gpus '"all"' --shm-size 10g --rm -it --name axolotl --ipc=host --ulimit memlock=-1 --ulimit stack=67108864 --mount type=bind,src="${PWD}",target=/workspace/axolotl -v ${HOME}/.cache/huggingface:/root/.cache/huggingface axolotlai/axolotl:main-py3.10-cu118-2.0.1
+docker run --privileged --gpus '"all"' --shm-size 10g --rm -it --name axolotl --ipc=host --ulimit memlock=-1 --ulimit stack=67108864 --mount type=bind,src="${PWD}",target=/workspace/axolotl -v ${HOME}/.cache/huggingface:/root/.cache/huggingface axolotlai/axolotl-uv:main-latest
 ```
 
 >[!Tip]
 > To understand which containers are available, see the [Docker section of the README](../README.md#docker) and the [DockerHub repo](https://hub.docker.com/r/axolotlai/axolotl/tags).  For details of how the Docker containers are built, see axolotl's [Docker CI builds](../.github/workflows/main.yml).
 
-You will now be in the container.  Next, perform an editable install of Axolotl:
+You will now be in the container.  Next, install Axolotl with dev dependencies:
 
 ```bash
-pip3 install packaging
+uv venv --no-project --relocatable
-pip3 install --no-build-isolation -e '.[flash-attn,deepspeed]'
+source .venv/bin/activate
+uv pip install --no-build-isolation -e '.[deepspeed]' --group dev --group test
 ```
 
 ### Attach To Container

docs/docker.qmd

@@ -6,23 +6,33 @@ format:
     toc-depth: 4
 ---
 
-This section describes the different Docker images that are released by AxolotlAI at [Docker Hub](https://hub.docker.com/u/axolotlai).
+This section describes the different Docker images that are released by AxolotlAI at
+[Docker Hub](https://hub.docker.com/u/axolotlai).
 
 ::: {.callout-important}
-For Blackwell GPUs, please use the tags with PyTorch 2.7.1 and CUDA 12.8.
+### Switch to the `-uv` images
+
+Each image below ships a **uv variant** that uses [uv](https://docs.astral.sh/uv/) with a relocatable venv
+(`/workspace/axolotl-venv`) instead of Miniconda + pip. Append `-uv` to the image name
+(e.g. `axolotlai/axolotl-uv`, `axolotlai/axolotl-base-uv`, `axolotlai/axolotl-cloud-uv`). Tags follow the
+same format as their non-uv counterparts.
+
+**We recommend switching to the `-uv` images early.** In the near future we will publish the uv-based
+build to the non-uv tags as well. The non-uv names will continue to work, but they will start serving
+the uv image.
 :::
 
 ## Base
 
-The base image is the most minimal image that can install Axolotl. It is based on the `nvidia/cuda` image. It includes python, torch, git, git-lfs, awscli, pydantic, and more.
+The base image is the most minimal image that can install Axolotl. It is based on the `nvidia/cuda` image.
+It includes python, torch, git, git-lfs, awscli, pydantic, and more.
 
 #### Image
 
-```
+| Variant | Image | Docker Hub |
-axolotlai/axolotl-base
+|---------|-------|------------|
-```
+| pip | `axolotlai/axolotl-base` | [Link](https://hub.docker.com/r/axolotlai/axolotl-base) |
-
+| uv | `axolotlai/axolotl-base-uv` | [Link](https://hub.docker.com/r/axolotlai/axolotl-base-uv) |
-Link: [Docker Hub](https://hub.docker.com/r/axolotlai/axolotl-base)
 
 #### Tags format
 
@@ -32,8 +42,10 @@ main-base-py{python_version}-cu{cuda_version}-{pytorch_version}
 
 Tags examples:
 
-- `main-base-py3.11-cu128-2.8.0`
 - `main-base-py3.11-cu128-2.9.1`
+- `main-base-py3.12-cu128-2.10.0`
+- `main-base-py3.12-cu130-2.9.1`
+- `main-base-py3.12-cu130-2.10.0`
 
 ## Main
 
@@ -41,11 +53,10 @@ The main image is the image that is used to run Axolotl. It is based on the `axo
 
 #### Image
 
-```
+| Variant | Image | Docker Hub |
-axolotlai/axolotl
+|---------|-------|------------|
-```
+| pip | `axolotlai/axolotl` | [Link](https://hub.docker.com/r/axolotlai/axolotl) |
-
+| uv | `axolotlai/axolotl-uv` | [Link](https://hub.docker.com/r/axolotlai/axolotl-uv) |
-Link: [Docker Hub](https://hub.docker.com/r/axolotlai/axolotl)
 
 #### Tags format {#sec-main-tags}
 
@@ -53,7 +64,7 @@ Link: [Docker Hub](https://hub.docker.com/r/axolotlai/axolotl)
 # on push to main
 main-py{python_version}-cu{cuda_version}-{pytorch_version}
 
-# latest main (currently torch 2.6.0, python 3.11, cuda 12.4)
+# latest main (currently torch 2.9.1, python 3.11, cuda 12.8)
 main-latest
 
 # nightly build
@@ -71,12 +82,13 @@ There may be some extra tags appended to the image, like `-vllm` which installs
 
 Tags examples:
 
-- `main-py3.11-cu128-2.8.0`
 - `main-py3.11-cu128-2.9.1`
+- `main-py3.12-cu128-2.10.0`
+- `main-py3.12-cu130-2.9.1`
+- `main-py3.12-cu130-2.10.0`
 - `main-latest`
-- `main-20250303-py3.11-cu124-2.6.0`
+- `main-20260315-py3.11-cu128-2.9.1`
-- `main-20250303-py3.11-cu126-2.6.0`
+- `0.16.1`
-- `0.12.0`
 
 ## Cloud
 
@@ -90,11 +102,10 @@ Jupyter lab is run by default. Set `JUPYTER_DISABLE=1` in the environment variab
 
 #### Image
 
-```
+| Variant | Image | Docker Hub |
-axolotlai/axolotl-cloud
+|---------|-------|------------|
-```
+| pip | `axolotlai/axolotl-cloud` | [Link](https://hub.docker.com/r/axolotlai/axolotl-cloud) |
-
+| uv | `axolotlai/axolotl-cloud-uv` | [Link](https://hub.docker.com/r/axolotlai/axolotl-cloud-uv) |
-Link: [Docker Hub](https://hub.docker.com/r/axolotlai/axolotl-cloud)
 
 #### Tags format
 

docs/faq.qmd

@@ -57,7 +57,7 @@ description: Frequently asked questions
 
 **Q: vLLM is not working with Axolotl**
 
-> A: We currently recommend torch 2.6.0 for use with `vllm`. Please ensure you use the right version. For Docker, please use the `main-py3.11-cu124-2.6.0` tag.
+> A: We currently recommend torch 2.10 for use with `vllm`. Please ensure you use the right version. For Docker, please use the `main-py3.12-cu128-2.10.0` tag (note: torch 2.10 images are built with Python 3.12).
 
 **Q: FA2 2.8.0 `undefined symbol` runtime error on CUDA 12.4**
 

docs/installation.qmd

@@ -15,64 +15,30 @@ This guide covers all the ways you can install and set up Axolotl for your envir
 
 - NVIDIA GPU (Ampere architecture or newer for `bf16` and Flash Attention) or AMD GPU
 - Python ≥3.11
-- PyTorch ≥2.6.0
+- PyTorch ≥2.9.1
 
-## Installation Methods {#sec-installation-methods}
+## Installation {#sec-installation}
-
-::: {.callout-important}
-Please make sure to have Pytorch installed before installing Axolotl in your local environment.
-
-Follow the instructions at: [https://pytorch.org/get-started/locally/](https://pytorch.org/get-started/locally/)
-:::
 
 ::: {.callout-important}
 For Blackwell GPUs, please use Pytorch 2.9.1 and CUDA 12.8.
 :::
 
-### PyPI Installation (Recommended) {#sec-pypi}
+### Quick Install {#sec-uv}
 
-```{.bash}
+Axolotl uses [uv](https://docs.astral.sh/uv/) as its package manager. uv is a fast, reliable Python package installer and resolver built in Rust.
-pip3 install -U packaging setuptools wheel ninja
-pip3 install --no-build-isolation axolotl[flash-attn,deepspeed]
-```
 
-We use `--no-build-isolation` in order to detect the installed PyTorch version (if
+Install uv if not already installed:
-installed) in order not to clobber it, and so that we set the correct version of
-dependencies that are specific to the PyTorch version or other installed
-co-dependencies.
-
-### uv Installation {#sec-uv}
-
-uv is a fast, reliable Python package installer and resolver built in Rust. It offers significant performance improvements over pip and provides better dependency resolution, making it an excellent choice for complex environments.
-
-Install uv if not already installed
 ```{.bash}
 curl -LsSf https://astral.sh/uv/install.sh | sh
 source $HOME/.local/bin/env
 ```
 
-Choose your CUDA version to use with PyTorch; e.g. `cu124`, `cu126`, `cu128`,
+Choose your CUDA version (e.g. `cu128`, `cu130`), create a venv, and install:
-then create the venv and activate
 ```{.bash}
-export UV_TORCH_BACKEND=cu126
+export UV_TORCH_BACKEND=cu128  # or cu130
-uv venv --no-project --relocatable
+uv venv
 source .venv/bin/activate
-```
+uv pip install --no-build-isolation axolotl[deepspeed]
-
-Install PyTorch
-- PyTorch 2.6.0 recommended
-```{.bash}
-uv pip install packaging setuptools wheel
-uv pip install torch==2.6.0
-uv pip install awscli pydantic
-```
-
-Install axolotl from PyPi
-```{.bash}
-uv pip install --no-build-isolation axolotl[deepspeed,flash-attn]
-
-# optionally install with vLLM if you're using torch==2.6.0 and want to train w/ GRPO
-uv pip install --no-build-isolation axolotl[deepspeed,flash-attn,vllm]
 ```
 
 ### Edge/Development Build {#sec-edge-build}
@@ -82,14 +48,16 @@ For the latest features between releases:
 ```{.bash}
 git clone https://github.com/axolotl-ai-cloud/axolotl.git
 cd axolotl
-pip3 install -U packaging setuptools wheel ninja
+export UV_TORCH_BACKEND=cu128  # or cu130
-pip3 install --no-build-isolation -e '.[flash-attn,deepspeed]'
+uv venv
+source .venv/bin/activate
+uv pip install --no-build-isolation -e '.[deepspeed]'
 ```
 
 ### Docker {#sec-docker}
 
 ```{.bash}
-docker run --gpus '"all"' --rm -it axolotlai/axolotl:main-latest
+docker run --gpus '"all"' --rm -it --ipc=host axolotlai/axolotl-uv:main-latest
 ```
 
 For development with Docker:
@@ -106,12 +74,12 @@ docker run --privileged --gpus '"all"' --shm-size 10g --rm -it \
   --ulimit memlock=-1 --ulimit stack=67108864 \
   --mount type=bind,src="${PWD}",target=/workspace/axolotl \
   -v ${HOME}/.cache/huggingface:/root/.cache/huggingface \
-  axolotlai/axolotl:main-latest
+  axolotlai/axolotl-uv:main-latest
 ```
 :::
 
 ::: {.callout-important}
-For Blackwell GPUs, please use `axolotlai/axolotl:main-py3.11-cu128-2.9.1` or the cloud variant `axolotlai/axolotl-cloud:main-py3.11-cu128-2.9.1`.
+For Blackwell GPUs, please use `axolotlai/axolotl-uv:main-py3.11-cu128-2.9.1` or the cloud variant `axolotlai/axolotl-cloud-uv:main-py3.11-cu128-2.9.1`.
 :::
 
 Please refer to the [Docker documentation](docker.qmd) for more information on the different Docker images that are available.
@@ -122,7 +90,7 @@ Please refer to the [Docker documentation](docker.qmd) for more information on t
 
 For providers supporting Docker:
 
-- Use `axolotlai/axolotl-cloud:main-latest`
+- Use `axolotlai/axolotl-cloud-uv:main-latest`
 - Available on:
     - [RunPod](https://runpod.io/gsc?template=v2ickqhz9s&ref=6i7fkpdz)
     - [Vast.ai](https://cloud.vast.ai?ref_id=62897&template_id=bdd4a49fa8bce926defc99471864cace&utm_source=axolotl&utm_medium=partner&utm_campaign=template_launch_july2025&utm_content=docs_link)
@@ -141,7 +109,7 @@ For providers supporting Docker:
 ### macOS {#sec-macos}
 
 ```{.bash}
-pip3 install --no-build-isolation -e '.'
+uv pip install --no-build-isolation -e '.'
 ```
 
 See @sec-troubleshooting for Mac-specific issues.
@@ -152,21 +120,44 @@ See @sec-troubleshooting for Mac-specific issues.
 We recommend using WSL2 (Windows Subsystem for Linux) or Docker.
 :::
 
-## Environment Managers {#sec-env-managers}
+## Migrating from pip to uv {#sec-migrating}
 
-### Conda/Pip venv {#sec-conda}
+If you have an existing pip-based Axolotl installation, you can migrate to uv:
 
-1. Install Python ≥3.11
+```{.bash}
-2. Install PyTorch: https://pytorch.org/get-started/locally/
+# Install uv
-3. Install Axolotl:
+curl -LsSf https://astral.sh/uv/install.sh | sh
-   ```{.bash}
+source $HOME/.local/bin/env
-   pip3 install -U packaging setuptools wheel ninja
+
-   pip3 install --no-build-isolation -e '.[flash-attn,deepspeed]'
+# Create a fresh venv (recommended for a clean start)
-   ```
+export UV_TORCH_BACKEND=cu128  # or cu130
-4. (Optional) Login to Hugging Face:
+uv venv
-   ```{.bash}
+source .venv/bin/activate
-   hf auth login
+
-   ```
+# Reinstall axolotl
+uv pip install --no-build-isolation axolotl[deepspeed]
+```
+
+## Using pip (Alternative) {#sec-pip}
+
+If you are unable to install uv, you can still use pip directly.
+
+::: {.callout-important}
+Please make sure to have PyTorch installed before installing Axolotl with pip.
+
+Follow the instructions at: [https://pytorch.org/get-started/locally/](https://pytorch.org/get-started/locally/)
+:::
+
+```{.bash}
+pip3 install -U packaging setuptools wheel ninja
+pip3 install --no-build-isolation axolotl[deepspeed]
+```
+
+For editable/development installs:
+```{.bash}
+pip3 install -U packaging setuptools wheel ninja
+pip3 install --no-build-isolation -e '.[deepspeed]'
+```
 
 ## Troubleshooting {#sec-troubleshooting}
 

docs/rlhf.qmd

@@ -320,8 +320,10 @@ The input format is a simple JSON input with customizable fields based on the ab
 As IPO is just DPO with a different loss function, all supported dataset formats for [DPO](#dpo) are also supported for IPO.
 
 ```yaml
-rl: ipo
+rl: dpo
+dpo_loss_type: ["ipo"]
 ```
+*Note:* Passing `rl: ipo` directly is still supported, but will soon be deprecated.
 
 ### ORPO
 

docs/unsloth.qmd

@@ -1,53 +0,0 @@
----
-title: "Unsloth"
-description: "Hyper-optimized QLoRA finetuning for single GPUs"
----
-
-### Overview
-
-Unsloth provides hand-written optimized kernels for LLM finetuning that slightly improve speed and VRAM over
-standard industry baselines.
-
-::: {.callout-important}
-Due to breaking changes in transformers `v4.48.0`, users will need to downgrade to `<=v4.47.1` to use this patch.
-
-This will later be deprecated in favor of [LoRA Optimizations](lora_optims.qmd).
-:::
-
-
-### Installation
-
-The following will install the correct unsloth and extras from source.
-
-```bash
-python scripts/unsloth_install.py | sh
-```
-
-### Usage
-
-Axolotl exposes a few configuration options to try out unsloth and get most of the performance gains.
-
-Our unsloth integration is currently limited to the following model architectures:
- - llama
-
-These options are specific to LoRA finetuning and cannot be used for multi-GPU finetuning
-```yaml
-unsloth_lora_mlp: true
-unsloth_lora_qkv: true
-unsloth_lora_o: true
-```
-
-These options are composable and can be used with multi-gpu finetuning
-```yaml
-unsloth_cross_entropy_loss: true
-unsloth_rms_norm: true
-unsloth_rope: true
-```
-
-### Limitations
-
-- Single GPU only; e.g. no multi-gpu support
-- No deepspeed or FSDP support (requires multi-gpu)
-- LoRA + QLoRA support only. No full fine tunes or fp8 support.
-- Limited model architecture support. Llama, Phi, Gemma, Mistral only
-- No MoE support.

examples/LiquidAI/README.md

@@ -15,8 +15,7 @@ Thanks to the team at LiquidAI for giving us early access to prepare for these r
     Here is an example of how to install from pip:
     ```bash
     # Ensure you have a compatible version of Pytorch installed
-    pip3 install packaging setuptools wheel ninja
+    uv pip install --no-build-isolation 'axolotl>=0.16.1'
-    pip3 install --no-build-isolation 'axolotl[flash-attn]>=0.12.0'
     ```
 
 2.  Run one of the finetuning examples below.
@@ -35,7 +34,7 @@ Thanks to the team at LiquidAI for giving us early access to prepare for these r
 
     **LFM2-MoE**
     ```bash
-    pip install git+https://github.com/huggingface/transformers.git@0c9a72e4576fe4c84077f066e585129c97bfd4e6
+    uv pip install git+https://github.com/huggingface/transformers.git@0c9a72e4576fe4c84077f066e585129c97bfd4e6
 
     # LoRA SFT (1x48GB @ 16.2GiB)
     axolotl train examples/LiquidAI/lfm2-8b-a1b-lora.yaml
@@ -45,7 +44,7 @@ Thanks to the team at LiquidAI for giving us early access to prepare for these r
 
 - **Installation Error**: If you encounter `ImportError: ... undefined symbol ...` or `ModuleNotFoundError: No module named 'causal_conv1d_cuda'`, the `causal-conv1d` package may have been installed incorrectly. Try uninstalling it:
   ```bash
-  pip uninstall -y causal-conv1d
+  uv pip uninstall causal-conv1d
   ```
 
 - **Dataset Loading**: Read more on how to load your own dataset in our [documentation](https://docs.axolotl.ai/docs/dataset_loading.html).

examples/apertus/README.md

@@ -11,12 +11,11 @@ This guide shows how to fine-tune it with Axolotl with multi-turn conversations
     Here is an example of how to install from main for pip:
 
 ```bash
-# Ensure you have Pytorch installed (Pytorch 2.6.0 min)
+# Ensure you have Pytorch installed (Pytorch 2.9.1 min)
 git clone https://github.com/axolotl-ai-cloud/axolotl.git
 cd axolotl
 
-pip3 install packaging==26.0 setuptools==75.8.0 wheel ninja
+uv pip install --no-build-isolation -e '.'
-pip3 install --no-build-isolation -e '.[flash-attn]'
 
 # Install CCE https://docs.axolotl.ai/docs/custom_integrations.html#cut-cross-entropy
 python scripts/cutcrossentropy_install.py | sh
@@ -31,7 +30,7 @@ python scripts/cutcrossentropy_install.py | sh
 # For those using our Docker image, use the below path.
 export CUDA_HOME=/usr/local/cuda
 
-pip3 install git+https://github.com/nickjbrowning/XIELU@59d6031 --no-build-isolation --no-deps
+uv pip install git+https://github.com/nickjbrowning/XIELU@59d6031 --no-build-isolation --no-deps
 ```
 
 For any installation errors, see [XIELU Installation Issues](#xielu-installation-issues)
@@ -67,7 +66,7 @@ If those didn't help, please try the below solutions:
 1. Pass env for CMAKE and try install again:
 
     ```bash
-    Python_EXECUTABLE=$(which python) pip3 install git+https://github.com/nickjbrowning/XIELU@59d6031 --no-build-isolation --no-deps
+    Python_EXECUTABLE=$(which python) uv pip install git+https://github.com/nickjbrowning/XIELU@59d6031 --no-build-isolation --no-deps
     ```
 
 2. Git clone the repo and manually hardcode python path:
@@ -92,7 +91,7 @@ If those didn't help, please try the below solutions:
     ```
 
     ```bash
-    pip3 install . --no-build-isolation --no-deps
+    uv pip install . --no-build-isolation --no-deps
     ```
 
 ## Optimization Guides

examples/arcee/README.md

@@ -13,12 +13,11 @@ Thanks to the team at Arcee.ai for using Axolotl in supervised fine-tuning the A
     Here is an example of how to install from main for pip:
 
 ```bash
-# Ensure you have Pytorch installed (Pytorch 2.6.0 min)
+# Ensure you have Pytorch installed (Pytorch 2.9.1 min)
 git clone https://github.com/axolotl-ai-cloud/axolotl.git
 cd axolotl
 
-pip3 install packaging==26.0 setuptools==75.8.0 wheel ninja
+uv pip install --no-build-isolation -e '.'
-pip3 install --no-build-isolation -e '.[flash-attn]'
 
 # Install CCE https://docs.axolotl.ai/docs/custom_integrations.html#cut-cross-entropy
 python scripts/cutcrossentropy_install.py | sh

examples/colab-notebooks/colab-axolotl-example.ipynb

@@ -36,12 +36,7 @@
     "id": "msOCO4NRmRLa"
    },
    "outputs": [],
-   "source": [
+   "source": "%%capture\n# This step can take ~5-10 minutes to install dependencies\n!pip install --no-build-isolation \"axolotl>=0.16.1\"\n!pip install \"cut-cross-entropy[transformers] @ git+https://github.com/axolotl-ai-cloud/ml-cross-entropy.git@fec1a88\""
-    "%%capture\n",
-    "# This step can take ~5-10 minutes to install dependencies\n",
-    "!pip install --no-build-isolation axolotl[flash-attn]>=0.9.1\n",
-    "!pip install \"cut-cross-entropy[transformers] @ git+https://github.com/axolotl-ai-cloud/ml-cross-entropy.git@fec1a88\""
-   ]
   },
   {
    "cell_type": "markdown",

examples/devstral/README.md

@@ -15,9 +15,8 @@ Thanks to the team at MistralAI for giving us early access to prepare for this r
     Here is an example of how to install from pip:
 
 ```bash
-# Ensure you have Pytorch installed (Pytorch 2.6.0 min)
+# Ensure you have Pytorch installed (Pytorch 2.9.1 min)
-pip3 install packaging==26.0 setuptools==75.8.0 wheel ninja
+uv pip install --no-build-isolation 'axolotl>=0.16.1'
-pip3 install --no-build-isolation 'axolotl[flash-attn]>=0.12.0'
 ```
 
 2. Install [Cut Cross Entropy](https://docs.axolotl.ai/docs/custom_integrations.html#cut-cross-entropy) to reduce training VRAM usage

examples/gemma3n/README.md

@@ -9,18 +9,17 @@ Gemma-3n is a family of multimodal models from Google found on [HuggingFace](htt
     Here is an example of how to install from pip:
 
 ```bash
-# Ensure you have Pytorch installed (Pytorch 2.6.0 min)
+# Ensure you have Pytorch installed (Pytorch 2.9.1 min)
-pip3 install packaging==26.0 setuptools==75.8.0 wheel ninja
+uv pip install --no-build-isolation 'axolotl>=0.16.1'
-pip3 install --no-build-isolation 'axolotl[flash-attn]>=0.12.0'
 ```
 
 2. In addition to Axolotl's requirements, Gemma-3n requires:
 
 ```bash
-pip3 install timm==1.0.17
+uv pip install timm==1.0.17
 
 # for loading audio data
-pip3 install librosa==0.11.0
+uv pip install librosa==0.11.0
 ```
 
 3. Download sample dataset files

examples/gpt-oss/README.md

@@ -13,9 +13,8 @@ This guide shows how to fine-tune it with Axolotl with multi-turn conversations
     Here is an example of how to install from pip:
 
 ```bash
-# Ensure you have Pytorch installed (Pytorch 2.6.0 min)
+# Ensure you have Pytorch installed (Pytorch 2.9.1 min)
-pip3 install packaging==26.0 setuptools==75.8.0 wheel ninja
+uv pip install --no-build-isolation 'axolotl>=0.16.1'
-pip3 install --no-build-isolation 'axolotl[flash-attn]>=0.12.0'
 ```
 
 2. Choose one of the following configs below for training the 20B model. (for 120B, see [below](#training-120b))
@@ -87,7 +86,7 @@ for more information about using a special vllm-openai docker image for inferenc
 Optionally, vLLM can be installed from nightly:
 
 ```bash
-pip install --no-build-isolation --pre -U vllm --extra-index-url https://wheels.vllm.ai/nightly
+uv pip install --no-build-isolation --pre -U vllm --extra-index-url https://wheels.vllm.ai/nightly
 ```
 and the vLLM server can be started with the following command (modify `--tensor-parallel-size 8` to match your environment):
 ```bash

examples/granite4/README.md

@@ -11,12 +11,11 @@ This guide shows how to fine-tune it with Axolotl with multi-turn conversations
     Here is an example of how to install from main for pip:
 
 ```bash
-# Ensure you have Pytorch installed (Pytorch 2.7.1 min)
+# Ensure you have Pytorch installed (Pytorch 2.9.1 min)
 git clone https://github.com/axolotl-ai-cloud/axolotl.git
 cd axolotl
 
-pip3 install packaging==26.0 setuptools==75.8.0 wheel ninja
+uv pip install --no-build-isolation -e '.'
-pip3 install --no-build-isolation -e '.[flash-attn]'
 
 # Install CCE https://docs.axolotl.ai/docs/custom_integrations.html#cut-cross-entropy
 python scripts/cutcrossentropy_install.py | sh

examples/hunyuan/README.md

@@ -9,12 +9,11 @@ Tencent released a family of opensource models called HunYuan with varying param
     Here is an example of how to install from main for pip:
 
 ```bash
-# Ensure you have Pytorch installed (Pytorch 2.6.0 min)
+# Ensure you have Pytorch installed (Pytorch 2.9.1 min)
 git clone https://github.com/axolotl-ai-cloud/axolotl.git
 cd axolotl
 
-pip3 install packaging==26.0 setuptools==75.8.0 wheel ninja
+uv pip install --no-build-isolation -e '.'
-pip3 install --no-build-isolation -e '.[flash-attn]'
 
 # Install CCE https://docs.axolotl.ai/docs/custom_integrations.html#cut-cross-entropy
 python scripts/cutcrossentropy_install.py | sh

examples/internvl3_5/README.md

@@ -11,7 +11,7 @@ This guide shows how to fine-tune it with Axolotl.
 2. Install `timm` for vision model support:
 
     ```bash
-    pip install timm==1.0.19
+    uv pip install timm==1.0.19
     ```
 
 3. Install [Cut Cross Entropy](https://docs.axolotl.ai/docs/custom_integrations.html#cut-cross-entropy) to reduce training VRAM usage.

examples/magistral/README.md

@@ -13,9 +13,8 @@ Thanks to the team at MistralAI for giving us early access to prepare for these
     Here is an example of how to install from pip:
 
 ```bash
-# Ensure you have Pytorch installed (Pytorch 2.7.0 min)
+# Ensure you have Pytorch installed (Pytorch 2.9.1 min)
-pip3 install packaging==26.0 setuptools==75.8.0 wheel ninja
+uv pip install --no-build-isolation 'axolotl>=0.16.1'
-pip3 install --no-build-isolation 'axolotl[flash-attn]>=0.12.0'
 ```
 
 2. Install [Cut Cross Entropy](https://docs.axolotl.ai/docs/custom_integrations.html#cut-cross-entropy) to reduce training VRAM usage

examples/magistral/vision/README.md

@@ -12,7 +12,7 @@ Before starting, ensure you have:
 
 1. Install the required vision lib:
     ```bash
-    pip install 'mistral-common[opencv]==1.8.5'
+    uv pip install 'mistral-common[opencv]==1.8.5'
     ```
 
 2. Download the example dataset image:

examples/ministral3/README.md

@@ -23,7 +23,7 @@ Note: This is still experimental given it is based on transformers v5 RC.
     git checkout transformers-v5
 
     # Install packages for transformers v5
-    pip install -e .
+    uv pip install -e .
     ```
 
 4. Run the fine-tuning:

examples/ministral3/vision/README.md

@@ -12,7 +12,7 @@ Before starting, ensure you have:
 
 1. Install the required vision lib:
     ```bash
-    pip install 'mistral-common[opencv]==1.8.6'
+    uv pip install 'mistral-common[opencv]==1.8.6'
     ```
 
 2. Download the example dataset image:

examples/mistral-small/README.md

@@ -12,7 +12,7 @@ Before starting, ensure you have:
 
 1. Install the required vision lib:
     ```bash
-    pip install 'mistral-common[opencv]==1.8.5'
+    uv pip install 'mistral-common[opencv]==1.8.5'
     ```
 
 2. Download the example dataset image:

examples/mistral4/README.md

@@ -13,7 +13,7 @@ Thanks to the team at MistralAI for giving us early access to prepare for this r
 3. Install transformers from main
 
   ```bash
-  pip install git+https://github.com/huggingface/transformers.git
+  uv pip install git+https://github.com/huggingface/transformers.git
   ```
 
 4. Run one of the example configs:

examples/qwen3-next/README.md

@@ -12,7 +12,7 @@ This guide shows how to fine-tune it with Axolotl with multi-turn conversations
 
 3. Install FLA for improved performance
 ```bash
-pip3 uninstall -y causal-conv1d && pip3 install flash-linear-attention==0.4.1
+uv pip uninstall causal-conv1d && uv pip install flash-linear-attention==0.4.1
 ```
 
 4. Run the finetuning example:

examples/qwen3.5/README.md

@@ -10,7 +10,7 @@
 
 3. Install FLA for sample packing support with the Gated DeltaNet linear attention layers:
   ```bash
-  pip3 uninstall -y causal-conv1d && pip3 install flash-linear-attention==0.4.1
+  uv pip uninstall causal-conv1d && uv pip install flash-linear-attention==0.4.1
   ```
   > FLA is required when `sample_packing: true`. Without it, training raises a `RuntimeError` on packed sequences. Vision configs use `sample_packing: false` so FLA is optional there.
 

examples/seed-oss/README.md

@@ -11,8 +11,7 @@ This guide shows how to fine-tune it with Axolotl with multi-turn conversations
     Here is an example of how to install from pip:
     ```bash
     # Ensure you have a compatible version of Pytorch installed
-    pip3 install packaging setuptools wheel ninja
+    uv pip install --no-build-isolation 'axolotl>=0.16.1'
-    pip3 install --no-build-isolation 'axolotl[flash-attn]>=0.12.0'
 
     # Install Cut Cross Entropy
     python scripts/cutcrossentropy_install.py | sh

examples/smolvlm2/README.md

@@ -13,14 +13,13 @@ This guide shows how to fine-tune SmolVLM2 models with Axolotl.
     Here is an example of how to install from pip:
     ```bash
     # Ensure you have a compatible version of Pytorch installed
-    pip3 install packaging setuptools wheel ninja
+    uv pip install --no-build-isolation 'axolotl>=0.16.1'
-    pip3 install --no-build-isolation 'axolotl[flash-attn]>=0.12.0'
     ```
 
 2. Install an extra dependency:
 
     ```bash
-    pip3 install num2words==0.5.14
+    uv pip install num2words==0.5.14
     ```
 
 3.  Run the finetuning example:

examples/voxtral/README.md

@@ -11,17 +11,16 @@ Thanks to the team at MistralAI for giving us early access to prepare for this r
     Here is an example of how to install from pip:
 
 ```bash
-# Ensure you have Pytorch installed (Pytorch 2.6.0 min)
+# Ensure you have Pytorch installed (Pytorch 2.9.1 min)
-pip3 install packaging==26.0 setuptools==75.8.0 wheel ninja
+uv pip install --no-build-isolation 'axolotl>=0.16.1'
-pip3 install --no-build-isolation 'axolotl[flash-attn]>=0.12.0'
 ```
 
 2. Please install the below.
 
 ```bash
 # audio
-pip3 install librosa==0.11.0
+uv pip install librosa==0.11.0
-pip3 install 'mistral_common[audio]==1.8.3'
+uv pip install 'mistral_common[audio]==1.8.3'
 
 # Install CCE https://docs.axolotl.ai/docs/custom_integrations.html#cut-cross-entropy
 python scripts/cutcrossentropy_install.py | sh

pyproject.toml

@@ -1,15 +1,165 @@
 [build-system]
-requires = ["setuptools>=64", "wheel", "setuptools_scm>=8", "packaging==26.0"]
+requires = ["setuptools>=64", "wheel", "setuptools_scm>=8"]
 build-backend = "setuptools.build_meta"
 
 [project]
 name = "axolotl"
-dynamic = ["version", "dependencies", "optional-dependencies"]
+dynamic = ["version"]
 description = "LLM Trainer"
 readme = "README.md"
 requires-python = ">=3.10"
 # license = "Apache-2.0"
 
+dependencies = [
+    # Core ML stack
+    "torch>=2.9.1",
+    "packaging==26.0",
+    "huggingface_hub>=1.1.7",
+    "peft>=0.19.1,<0.20.0",
+    "tokenizers>=0.22.1",
+    "transformers==5.5.4",
+    "accelerate==1.13.0",
+    "datasets>=4.8.4,<4.9.0",
+    "trl==1.1.0",
+    "hf_xet==1.4.3",
+    "kernels==0.13.0",
+    "trackio>=0.16.1",
+    "typing-extensions>=4.15.0",
+    "optimum==1.16.2",
+    "hf_transfer",
+    "sentencepiece",
+    "gradio>=6.2.0,<7.0",
+    "modal==1.3.0.post1",
+    "pydantic>=2.10.6",
+    "addict",
+    "fire",
+    "PyYAML>=6.0",
+    "requests",
+    "wandb",
+    "einops",
+    "colorama",
+    "numba>=0.61.2",
+    "numpy>=2.2.6",
+
+    # Evaluation & metrics
+    "evaluate==0.4.1",
+    "scipy",
+    "nvidia-ml-py==12.560.30",
+    "art",
+    "tensorboard",
+    "python-dotenv==1.0.1",
+
+    # Remote filesystems
+    "s3fs>=2024.5.0",
+    "gcsfs>=2025.3.0",
+    "adlfs>=2024.5.0",
+    "ocifs==1.3.2",
+
+    "zstandard==0.22.0",
+    "fastcore",
+
+    # lm eval harness
+    "lm_eval==0.4.11",
+    "langdetect==1.0.9",
+    "immutabledict==4.2.0",
+    "antlr4-python3-runtime==4.13.2",
+
+    "schedulefree==1.4.1",
+    "openenv-core==0.1.0",
+
+    # Axolotl contribs
+    "axolotl-contribs-lgpl==0.0.7",
+    "axolotl-contribs-mit==0.0.6",
+
+    # Telemetry
+    "posthog==6.7.11",
+
+    "mistral-common==1.11.0",
+
+    # Platform-specific (Linux only)
+    "bitsandbytes==0.49.1 ; sys_platform != 'darwin'",
+    "triton>=3.4.0 ; sys_platform != 'darwin'",
+    "xformers>=0.0.33.post2 ; sys_platform != 'darwin' and platform_machine != 'aarch64'",
+    "liger-kernel==0.7.0 ; sys_platform != 'darwin'",
+    "torchao==0.17.0 ; sys_platform != 'darwin' and platform_machine != 'aarch64'",
+
+    # Architecture-specific
+    "fla-core==0.4.1 ; platform_machine != 'aarch64'",
+    "flash-linear-attention==0.4.1 ; platform_machine != 'aarch64'",
+]
+
+[project.optional-dependencies]
+flash-attn = ["flash-attn==2.8.3"]
+ring-flash-attn = [
+    "flash-attn==2.8.3",
+    "ring-flash-attn>=0.1.7",
+]
+deepspeed = [
+    "deepspeed>=0.18.6,<0.19.0",
+    "deepspeed-kernels",
+]
+mamba-ssm = [
+    "mamba-ssm==1.2.0.post1",
+    "causal_conv1d",
+]
+auto-gptq = [
+    "auto-gptq==0.5.1",
+]
+mlflow = [
+    "mlflow",
+]
+galore = [
+    "galore_torch",
+]
+apollo = [
+    "apollo-torch",
+]
+optimizers = [
+    "galore_torch",
+    "apollo-torch",
+    "lomo-optim==0.1.1",
+    "torch-optimi==0.2.1",
+    "came_pytorch==0.1.3",
+]
+ray = [
+    "ray[train]>=2.52.1",
+]
+vllm = [
+    "vllm>=0.15.0",
+]
+llmcompressor = [
+    "llmcompressor>=0.10.0",
+]
+fbgemm-gpu = ["fbgemm-gpu-genai>=1.3.0"]
+opentelemetry = [
+    "opentelemetry-api",
+    "opentelemetry-sdk",
+    "opentelemetry-exporter-prometheus",
+    "prometheus-client",
+]
+
+[dependency-groups]
+dev = [
+    "black",
+    "mypy",
+    "pre-commit",
+    "types-requests",
+    "quartodoc",
+    "jupyter",
+    "blobfile",
+    "tiktoken",
+]
+test = [
+    "codecov",
+    "codecov-cli",
+    "pytest",
+    "pytest-cov",
+    "pytest-retry",
+    "pytest-sugar",
+    "pytest-xdist",
+    "tbparse",
+]
+
 [project.scripts]
 axolotl = "axolotl.cli.main:main"
 
@@ -18,18 +168,15 @@ Homepage = "https://axolotl.ai/"
 Documentation = "https://docs.axolotl.ai/"
 Repository = "https://github.com/axolotl-ai-cloud/axolotl.git"
 
-[tool.setuptools_scm]
-
 [tool.setuptools]
-py-modules = ["setuptools_axolotl_dynamic_dependencies"]
 include-package-data = true
 
+[tool.setuptools.packages.find]
+where = ["src"]
+
 [tool.setuptools.dynamic]
 version = { file = "VERSION" }
 
-[tool.setuptools.cmdclass]
-build_py = "setuptools_axolotl_dynamic_dependencies.BuildPyCommand"
-
 [tool.ruff]
 line-length = 88
 target-version = "py310"
@@ -67,5 +214,43 @@ markers = [
     "slow: marks tests as slow",
 ]
 
+# UV specific configuration
+[tool.uv]
+prerelease = "allow"
+conflicts = [
+    [
+        { package = "axolotl" },
+        { extra = "vllm" },
+    ],
+    [
+        { package = "axolotl" },
+        { extra = "flash-attn" },
+    ],
+    [
+        { package = "axolotl" },
+        { extra = "ring-flash-attn" },
+    ],
+    [
+        { package = "axolotl" },
+        { extra = "mamba-ssm" },
+    ],
+    [
+        { package = "axolotl" },
+        { extra = "auto-gptq" },
+    ],
+    [
+        { package = "axolotl" },
+        { extra = "fbgemm-gpu" },
+    ],
+    [
+        { package = "axolotl" },
+        { extra = "llmcompressor" },
+    ],
+]
+
 [tool.uv.extra-build-dependencies]
-axolotl = ["huggingface_hub"]
+mamba-ssm = [{ requirement = "torch", match-runtime = true }]
+causal-conv1d = [{ requirement = "torch", match-runtime = true }]
+flash-attn = [{ requirement = "torch", match-runtime = true }]
+deepspeed = [{ requirement = "torch", match-runtime = true }]
+auto-gptq = [{ requirement = "torch", match-runtime = true }]

requirements-dev.txt

@@ -1,8 +0,0 @@
-black
-mypy
-pre-commit
-types-requests
-quartodoc
-jupyter
-blobfile
-tiktoken

requirements-tests.txt

@@ -1,8 +0,0 @@
-codecov
-codecov-cli
-pytest
-pytest-cov
-pytest-retry
-pytest-sugar
-pytest-xdist
-tbparse

requirements.txt

@@ -1,78 +0,0 @@
---extra-index-url https://huggingface.github.io/autogptq-index/whl/cu118/
-
-# START section of dependencies that don't install on Darwin/MacOS
-bitsandbytes==0.49.1
-triton>=3.4.0
-mamba-ssm==1.2.0.post1
-xformers>=0.0.23.post1
-liger-kernel==0.7.0
-# END section
-
-packaging==26.0
-huggingface_hub>=1.1.7
-peft>=0.19.0,<0.20.0
-tokenizers>=0.22.1
-transformers==5.5.4
-accelerate==1.13.0
-datasets>=4.8.4,<4.9.0
-deepspeed>=0.18.6,<0.19.0
-trl==1.1.0
-hf_xet==1.4.3
-kernels==0.13.0
-
-fla-core==0.4.1
-flash-linear-attention==0.4.1
-
-trackio>=0.16.1
-typing-extensions>=4.15.0
-
-optimum==1.16.2
-hf_transfer
-sentencepiece
-gradio>=6.2.0,<7.0
-
-modal==1.3.0.post1
-pydantic>=2.10.6
-addict
-fire
-PyYAML>=6.0
-requests
-wandb
-einops
-colorama
-numba>=0.61.2
-numpy>=2.2.6
-
-# qlora things
-evaluate==0.4.1
-scipy
-nvidia-ml-py==12.560.30
-art
-tensorboard
-python-dotenv==1.0.1
-
-# remote filesystems
-s3fs>=2024.5.0
-gcsfs>=2025.3.0
-adlfs>=2024.5.0
-ocifs==1.3.2
-
-zstandard==0.22.0
-fastcore
-
-# lm eval harness
-lm_eval==0.4.11
-langdetect==1.0.9
-immutabledict==4.2.0
-antlr4-python3-runtime==4.13.2
-
-torchao==0.17.0
-openenv-core==0.1.0
-schedulefree==1.4.1
-
-axolotl-contribs-lgpl==0.0.7
-axolotl-contribs-mit==0.0.6
-# telemetry
-posthog==6.7.11
-
-mistral-common==1.11.0

scripts/unsloth_install.py

@@ -1,40 +0,0 @@
-# noqa
-import sys
-
-try:
-    import torch
-except ImportError as error:
-    raise ImportError("Install torch via `pip install torch`") from error
-from packaging.version import Version as V
-
-use_uv = "--uv" in sys.argv[1:]
-
-v = V(torch.__version__)
-cuda = str(torch.version.cuda)
-try:
-    is_ampere = torch.cuda.get_device_capability()[0] >= 8
-except RuntimeError:
-    is_ampere = False
-if cuda != "12.1" and cuda != "11.8" and cuda != "12.4":
-    raise RuntimeError(f"CUDA = {cuda} not supported!")
-if v <= V("2.1.0"):
-    raise RuntimeError(f"Torch = {v} too old!")
-elif v <= V("2.1.1"):
-    x = "cu{}{}-torch211"
-elif v <= V("2.1.2"):
-    x = "cu{}{}-torch212"
-elif v < V("2.3.0"):
-    x = "cu{}{}-torch220"
-elif v < V("2.4.0"):
-    x = "cu{}{}-torch230"
-elif v < V("2.5.0"):
-    x = "cu{}{}-torch240"
-elif v < V("2.6.0"):
-    x = "cu{}{}-torch250"
-else:
-    raise RuntimeError(f"Torch = {v} too new!")
-x = x.format(cuda.replace(".", ""), "-ampere" if is_ampere else "")
-uv_prefix = "uv " if use_uv else ""
-print(
-    f'{uv_prefix}pip install unsloth-zoo==2024.12.1 && {uv_prefix}pip install --no-deps "unsloth[{x}]==2024.12.4"'
-)

setup.py

@@ -1,230 +0,0 @@
-"""setup.py for axolotl"""
-
-import os
-import platform
-import re
-from importlib.metadata import PackageNotFoundError, version
-from pathlib import Path
-
-from setuptools import find_packages, setup
-
-
-def parse_requirements(extras_require_map):
-    _install_requires = []
-    _dependency_links = []
-    with open("./requirements.txt", encoding="utf-8") as requirements_file:
-        lines = [r.strip() for r in requirements_file.readlines()]
-        for line in lines:
-            is_extras = "deepspeed" in line or "mamba-ssm" in line
-            if line.startswith("--extra-index-url"):
-                # Handle custom index URLs
-                _, url = line.split()
-                _dependency_links.append(url)
-            elif not is_extras and line and line[0] != "#":
-                # Handle standard packages
-                _install_requires.append(line)
-    try:
-        xformers_version = [req for req in _install_requires if "xformers" in req][0]
-        install_xformers = platform.machine() != "aarch64"
-        if platform.machine() == "aarch64":
-            # skip on ARM64
-            skip_packages = [
-                "torchao",
-                "fla-core",
-                "flash-linear-attention",
-            ]
-            _install_requires = [
-                req
-                for req in _install_requires
-                if re.split(r"[>=<]", req)[0].strip() not in skip_packages
-            ]
-        if "Darwin" in platform.system():
-            # skip packages not compatible with OSX
-            skip_packages = [
-                "bitsandbytes",
-                "triton",
-                "mamba-ssm",
-                "xformers",
-                "liger-kernel",
-            ]
-            _install_requires = [
-                req
-                for req in _install_requires
-                if re.split(r"[>=<]", req)[0].strip() not in skip_packages
-            ]
-            print(
-                _install_requires, [req in skip_packages for req in _install_requires]
-            )
-        else:
-            # detect the version of torch already installed
-            # and set it so dependencies don't clobber the torch version
-            try:
-                torch_version = version("torch")
-            except PackageNotFoundError:
-                torch_version = "2.8.0"  # default to torch 2.8.0
-            _install_requires.append(f"torch=={torch_version}")
-
-            version_match = re.match(r"^(\d+)\.(\d+)(?:\.(\d+))?", torch_version)
-            if version_match:
-                major, minor, patch = version_match.groups()
-                major, minor = int(major), int(minor)
-                patch = (
-                    int(patch) if patch is not None else 0
-                )  # Default patch to 0 if not present
-            else:
-                raise ValueError("Invalid version format")
-
-            torch_parts = torch_version.split("+")
-            if len(torch_parts) == 2:
-                torch_cuda_version = torch_parts[1]
-                _dependency_links.append(
-                    f"https://download.pytorch.org/whl/{torch_cuda_version}"
-                )
-
-            if (major, minor) >= (2, 10):
-                extras_require_map.pop("fbgemm-gpu")
-                extras_require_map["fbgemm-gpu"] = [
-                    "fbgemm-gpu==1.5.0",
-                    "fbgemm-gpu-genai==1.5.0",
-                ]
-                if not install_xformers:
-                    _install_requires.pop(_install_requires.index(xformers_version))
-                extras_require_map["vllm"] = ["vllm>=0.19.0"]
-            elif (major, minor) >= (2, 9):
-                extras_require_map.pop("fbgemm-gpu")
-                extras_require_map["fbgemm-gpu"] = [
-                    "fbgemm-gpu==1.4.0",
-                    "fbgemm-gpu-genai==1.4.2",
-                ]
-                if not install_xformers:
-                    _install_requires.pop(_install_requires.index(xformers_version))
-                if patch == 0:
-                    extras_require_map["vllm"] = ["vllm==0.13.0"]
-                else:
-                    extras_require_map["vllm"] = ["vllm==0.14.0"]
-            elif (major, minor) >= (2, 8):
-                extras_require_map.pop("fbgemm-gpu")
-                extras_require_map["fbgemm-gpu"] = ["fbgemm-gpu-genai==1.3.0"]
-                extras_require_map["vllm"] = ["vllm==0.11.0"]
-                if not install_xformers:
-                    _install_requires.pop(_install_requires.index(xformers_version))
-            elif (major, minor) >= (2, 7):
-                _install_requires.pop(_install_requires.index(xformers_version))
-                if patch == 0:
-                    if install_xformers:
-                        _install_requires.append("xformers==0.0.30")
-                    # vllm 0.9.x is incompatible with latest transformers
-                    extras_require_map.pop("vllm")
-                else:
-                    if install_xformers:
-                        _install_requires.append("xformers==0.0.31")
-                    extras_require_map["vllm"] = ["vllm==0.10.1"]
-            elif (major, minor) >= (2, 6):
-                _install_requires.pop(_install_requires.index(xformers_version))
-                if install_xformers:
-                    _install_requires.append("xformers==0.0.29.post3")
-                # since we only support 2.6.0+cu126
-                _dependency_links.append("https://download.pytorch.org/whl/cu126")
-                extras_require_map.pop("vllm")
-            elif (major, minor) >= (2, 5):
-                _install_requires.pop(_install_requires.index(xformers_version))
-                if install_xformers:
-                    if patch == 0:
-                        _install_requires.append("xformers==0.0.28.post2")
-                    else:
-                        _install_requires.append("xformers>=0.0.28.post3")
-                extras_require_map.pop("vllm")
-            elif (major, minor) >= (2, 4):
-                extras_require_map.pop("vllm")
-                if install_xformers:
-                    if patch == 0:
-                        _install_requires.pop(_install_requires.index(xformers_version))
-                        _install_requires.append("xformers>=0.0.27")
-                    else:
-                        _install_requires.pop(_install_requires.index(xformers_version))
-                        _install_requires.append("xformers==0.0.28.post1")
-            else:
-                raise ValueError("axolotl requires torch>=2.4")
-
-    except PackageNotFoundError:
-        pass
-    return _install_requires, _dependency_links, extras_require_map
-
-
-def get_package_version():
-    with open(
-        Path(os.path.dirname(os.path.abspath(__file__))) / "VERSION",
-        "r",
-        encoding="utf-8",
-    ) as fin:
-        version_ = fin.read().strip()
-    return version_
-
-
-extras_require = {
-    "flash-attn": ["flash-attn==2.8.3"],
-    "ring-flash-attn": [
-        "flash-attn==2.8.3",
-        "ring-flash-attn>=0.1.7",
-    ],
-    "deepspeed": [
-        "deepspeed==0.18.2",
-        "deepspeed-kernels",
-    ],
-    "mamba-ssm": [
-        "mamba-ssm==1.2.0.post1",
-        "causal_conv1d",
-    ],
-    "auto-gptq": [
-        "auto-gptq==0.5.1",
-    ],
-    "mlflow": [
-        "mlflow",
-    ],
-    "galore": [
-        "galore_torch",
-    ],
-    "apollo": [
-        "apollo-torch",
-    ],
-    "optimizers": [
-        "galore_torch",
-        "apollo-torch",
-        "lomo-optim==0.1.1",
-        "torch-optimi==0.2.1",
-        "came_pytorch==0.1.3",
-    ],
-    "ray": [
-        "ray[train]>=2.52.1",
-    ],
-    "vllm": [
-        "vllm==0.10.0",
-    ],
-    "llmcompressor": [
-        "llmcompressor==0.5.1",
-    ],
-    "fbgemm-gpu": ["fbgemm-gpu-genai==1.3.0"],
-    "opentelemetry": [
-        "opentelemetry-api",
-        "opentelemetry-sdk",
-        "opentelemetry-exporter-prometheus",
-        "prometheus-client",
-    ],
-}
-install_requires, dependency_links, extras_require_build = parse_requirements(
-    extras_require
-)
-
-setup(
-    version=get_package_version(),
-    package_dir={"": "src"},
-    packages=find_packages("src"),
-    install_requires=install_requires,
-    dependency_links=dependency_links,
-    entry_points={
-        "console_scripts": [
-            "axolotl=axolotl.cli.main:main",
-        ],
-    },
-    extras_require=extras_require_build,
-)

src/axolotl/cli/utils/lora_merge.py

@@ -339,7 +339,11 @@ def _build_peft_layer_and_get_delta(
             )
         layer.lora_A[adapter_name].weight.data = lora_a
         layer.lora_B[adapter_name].weight.data = lora_b
-        return layer.get_delta_weight(adapter_name)
+        delta = layer.get_delta_weight(adapter_name)
+        # peft >=0.19.1 may return delta with transposed dims for 3D params
+        if delta.shape != base_tensor.shape and delta.ndim == 3:
+            delta = delta.transpose(1, 2).contiguous()
+        return delta
     elif (
         layer_type and "Conv" in layer_type or (layer_type is None and lora_a.ndim > 2)
     ):

src/axolotl/core/builders/causal.py

@@ -370,7 +370,7 @@ class HFCausalTrainerBuilder(TrainerBuilderBase):
         data_collator_kwargs = {
             "padding": True,  # True/"longest" is the default
         }
-        multiple = 64
+        multiple = getattr(self.cfg, "pad_to_multiple_of", None) or 64
         if self.cfg.pad_to_sequence_len:
             data_collator_kwargs["pad_to_multiple_of"] = multiple * math.ceil(
                 self.cfg.sequence_len / multiple

src/axolotl/core/builders/rl.py

@@ -228,9 +228,47 @@ class HFRLTrainerBuilder(TrainerBuilderBase):
 
         return training_args, trainer_kwargs
 
+    def build_collator(self, **kwargs):
+        """Build a data collator for preference-tuning trainers.
+
+        Returns None for RL types that provide their own collator (e.g. GRPO,
+        KTO), letting the trainer construct its default. For DPO/IPO/ORPO/SIMPO
+        returns an ``AxolotlDPODataCollatorWithPadding`` when
+        ``pad_to_multiple_of`` is set, otherwise None (so the trainer
+        falls back to the TRL default).
+        """
+        if self.cfg.rl not in (
+            RLType.DPO,
+            RLType.IPO,
+            RLType.ORPO,
+            RLType.SIMPO,
+        ):
+            return None
+
+        pad_to_multiple_of = getattr(self.cfg, "pad_to_multiple_of", None)
+        if not pad_to_multiple_of:
+            return None
+
+        from axolotl.utils.collators.dpo import AxolotlDPODataCollatorWithPadding
+
+        LOG.info(
+            f"Using AxolotlDPODataCollatorWithPadding with pad_to_multiple_of="
+            f"{pad_to_multiple_of}"
+        )
+        is_enc_dec = getattr(self.model.config, "is_encoder_decoder", False)
+        return AxolotlDPODataCollatorWithPadding(
+            pad_token_id=self.tokenizer.pad_token_id,
+            is_encoder_decoder=is_enc_dec,
+            pad_to_multiple_of=pad_to_multiple_of,
+            **kwargs,
+        )
+
     def build(self, total_num_steps):
         training_args, trainer_kwargs = self._build_training_arguments(total_num_steps)
 
+        if (data_collator := self.build_collator()) is not None:
+            trainer_kwargs["data_collator"] = data_collator
+
         if self.eval_dataset:
             trainer_kwargs["eval_dataset"] = self.eval_dataset
         if (

src/axolotl/core/trainers/dpo/__init__.py

@@ -20,8 +20,16 @@ class DPOStrategy:
     @classmethod
     def set_training_args_kwargs(cls, cfg):
         training_args_kwargs = {}
+        if cfg.rl is RLType.DPO:
+            if cfg.dpo_loss_type is not None:
+                training_args_kwargs["loss_type"] = cfg.dpo_loss_type
+
+            if cfg.dpo_loss_weights is not None:
+                training_args_kwargs["loss_weights"] = cfg.dpo_loss_weights
+
         if cfg.rl is RLType.IPO:
             training_args_kwargs["loss_type"] = ["ipo"]
+
         # Label smoothing is not compatible with IPO
         if cfg.rl is RLType.DPO and cfg.dpo_label_smoothing:
             training_args_kwargs["label_smoothing"] = cfg.dpo_label_smoothing

src/axolotl/integrations/hatchery/__init__.py

@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Axolotl AI
+# Licensed under the Apache License, Version 2.0
+
+"""Hatchery/Tinker remote training integration for Axolotl.
+
+Routes axolotl's preprocessed data to a remote training API (Tinker or
+Hatchery) instead of running forward/backward locally. The remote
+service handles model weights, LoRA adapters, and gradient updates.
+"""
+
+from .args import HatcheryArgs, HatcheryConfig
+from .plugin import HatcheryPlugin
+
+__all__ = ["HatcheryArgs", "HatcheryConfig", "HatcheryPlugin"]
+
+# Usage:
+#   plugins:
+#     - axolotl.integrations.hatchery.HatcheryPlugin
+#
+#   hatchery:
+#     backend: tinker  # or "hatchery"
+#     lora_rank: 32
+#     loss_fn: cross_entropy  # SFT
+#     # loss_fn: ppo         # RL (auto-selects HatcheryRLTrainer)
+#
+#   learning_rate: 1e-4  # top-level, not under hatchery:

src/axolotl/integrations/hatchery/args.py

@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Axolotl AI
+# Licensed under the Apache License, Version 2.0
+
+"""Pydantic config schema for the Hatchery integration."""
+
+from __future__ import annotations
+
+from typing import Any, Literal, Optional
+
+from pydantic import BaseModel, Field
+
+
+class HatcheryConfig(BaseModel):
+    """Nested config under `hatchery:` in the axolotl YAML.
+
+    Only contains hatchery-specific settings. Standard training params
+    (learning_rate, weight_decay, adam_beta1/2, max_grad_norm,
+    gradient_accumulation_steps) are read from axolotl's top-level config.
+    """
+
+    # Backend & connection
+    backend: Literal["tinker", "hatchery"] = "tinker"
+    base_url: Optional[str] = None
+    api_key: Optional[str] = None
+    project_id: Optional[str] = None
+
+    # LoRA config sent to remote
+    lora_rank: int = Field(32, ge=1, le=256)
+    train_attn: bool = True
+    train_mlp: bool = True
+    train_unembed: bool = True
+
+    # Loss function
+    loss_fn: Literal["cross_entropy", "importance_sampling", "ppo", "cispo", "dro"] = (
+        "cross_entropy"
+    )
+    loss_fn_config: Optional[dict[str, Any]] = None
+
+    # Pipelining: submit next batch before awaiting previous result
+    pipeline: bool = True
+
+    # Sampling params (for RL flows)
+    max_sample_tokens: int = 256
+    sample_temperature: float = 1.0
+    num_samples: int = 4
+
+    # Reward functions (for RL) — list of fully qualified names
+    reward_funcs: Optional[list[str]] = None
+
+    # Checkpointing
+    save_steps: Optional[int] = None
+    save_name_prefix: str = "checkpoint"
+
+    # Timeout per future (seconds)
+    future_timeout: float = 600.0
+
+
+class HatcheryArgs(BaseModel):
+    """Top-level mixin that adds the nested `hatchery:` field."""
+
+    hatchery: Optional[HatcheryConfig] = None

src/axolotl/integrations/hatchery/data.py

@@ -0,0 +1,160 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Axolotl AI
+# Licensed under the Apache License, Version 2.0
+
+"""Convert axolotl batch tensors to Tinker/Hatchery Datum format.
+
+Both Tinker and Hatchery expect the client to apply the causal LM shift:
+
+  Original tokens:  [t0, t1, t2, ..., t_{L-1}]
+  model_input:      [t0, t1, ..., t_{L-2}]       (last token dropped)
+  target_tokens:    [t1, t2, ..., t_{L-1}]        (first token dropped)
+  weights:          [w1, w2, ..., w_{L-1}]        (aligned to targets)
+
+At position i, the model sees t_i and predicts target_tokens[i] = t_{i+1}.
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+import torch
+
+
+def _tensor_to_wire(t: torch.Tensor) -> dict[str, Any]:
+    """Serialize a tensor to the TensorData wire dict."""
+    flat = t.detach().cpu().flatten()
+    dtype_map = {
+        torch.float32: "float32",
+        torch.float16: "float16",
+        torch.bfloat16: "bfloat16",
+        torch.int64: "int64",
+        torch.int32: "int32",
+    }
+    return {
+        "dtype": dtype_map.get(flat.dtype, "float32"),
+        "shape": list(t.shape),
+        "data": flat.tolist(),
+    }
+
+
+def _make_datum(
+    tokens: list[int],
+    loss_fn_inputs: dict[str, torch.Tensor],
+) -> dict[str, Any]:
+    """Build a Datum as a plain dict (wire-compatible with both Tinker and Hatchery)."""
+    return {
+        "model_input": {
+            "chunks": [{"type": "encoded_text", "tokens": tokens}],
+        },
+        "loss_fn_inputs": {
+            key: _tensor_to_wire(tensor) for key, tensor in loss_fn_inputs.items()
+        },
+    }
+
+
+def datums_to_tinker(datums: list[dict[str, Any]]):
+    """Wrap plain-dict datums into tinker.types.Datum objects.
+
+    Both the Tinker SDK and updated Hatchery client accept these.
+    """
+    import tinker.types as tt
+
+    result = []
+    for d in datums:
+        tokens = d["model_input"]["chunks"][0]["tokens"]
+        tinker_inputs = {}
+        for key, wire in d["loss_fn_inputs"].items():
+            tinker_inputs[key] = tt.TensorData(
+                data=wire["data"],
+                dtype=wire["dtype"],
+                shape=wire["shape"],
+            )
+        result.append(
+            tt.Datum(
+                model_input=tt.ModelInput.from_ints(tokens),
+                loss_fn_inputs=tinker_inputs,
+            )
+        )
+    return result
+
+
+def batch_to_datums_sft(
+    input_ids: torch.Tensor,
+    labels: torch.Tensor,
+    attention_mask: torch.Tensor | None = None,
+) -> list[dict[str, Any]]:
+    """Convert an axolotl SFT batch to Datum dicts with causal shift."""
+    batch_size = input_ids.size(0)
+    datums = []
+
+    for i in range(batch_size):
+        ids = input_ids[i]
+        lbl = labels[i]
+
+        if attention_mask is not None:
+            seq_len = int(attention_mask[i].sum().item())
+            ids = ids[:seq_len]
+            lbl = lbl[:seq_len]
+
+        model_tokens = ids[:-1].tolist()
+        shifted_labels = lbl[1:]
+
+        target_tokens = shifted_labels.clone()
+        weights = (shifted_labels != -100).float()
+        target_tokens[target_tokens == -100] = 0
+
+        datums.append(
+            _make_datum(
+                model_tokens,
+                {
+                    "target_tokens": target_tokens,
+                    "weights": weights,
+                },
+            )
+        )
+
+    return datums
+
+
+def batch_to_datums_rl(
+    input_ids: torch.Tensor,
+    labels: torch.Tensor,
+    logprobs: torch.Tensor,
+    advantages: torch.Tensor,
+    attention_mask: torch.Tensor | None = None,
+) -> list[dict[str, Any]]:
+    """Convert an RL batch to importance_sampling/ppo Datum dicts with causal shift."""
+    batch_size = input_ids.size(0)
+    datums = []
+
+    for i in range(batch_size):
+        ids = input_ids[i]
+        lbl = labels[i]
+
+        if attention_mask is not None:
+            seq_len = int(attention_mask[i].sum().item())
+        else:
+            seq_len = ids.size(0)
+        ids = ids[:seq_len]
+        lbl = lbl[:seq_len]
+        lp = logprobs[i, :seq_len]
+        adv = advantages[i, :seq_len]
+
+        model_tokens = ids[:-1].tolist()
+
+        target_tokens = lbl[1:].clone()
+        target_tokens[target_tokens == -100] = 0
+
+        datums.append(
+            _make_datum(
+                model_tokens,
+                {
+                    "target_tokens": target_tokens,
+                    "logprobs": lp[1:],
+                    "advantages": adv[1:],
+                },
+            )
+        )
+
+    return datums

src/axolotl/integrations/hatchery/examples/prep_math_rl.py

@@ -0,0 +1,87 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Axolotl AI
+# Licensed under the Apache License, Version 2.0
+
+"""Prepare hendrycks_math for RL training with Hatchery/Tinker.
+
+Creates a dataset with chat-formatted prompts that include
+a hidden gold answer tag for the reward function.
+
+Run:
+  python src/axolotl/integrations/hatchery/examples/prep_math_rl.py
+"""
+
+import os
+import re
+
+from datasets import Dataset, load_dataset
+from transformers import AutoTokenizer
+
+
+def extract_boxed(text: str) -> str:
+    match = re.search(r"\\boxed\{", text)
+    if not match:
+        return ""
+    start = match.end()
+    depth = 1
+    i = start
+    while i < len(text) and depth > 0:
+        if text[i] == "{":
+            depth += 1
+        elif text[i] == "}":
+            depth -= 1
+        i += 1
+    return text[start : i - 1] if depth == 0 else ""
+
+
+def main():
+    tokenizer = AutoTokenizer.from_pretrained("Qwen/Qwen3-8B", trust_remote_code=True)
+
+    ds = load_dataset("EleutherAI/hendrycks_math", "algebra", split="test")
+    level = os.environ.get("MATH_LEVEL", "Level 1")
+    filtered_rows = [x for x in ds if x["level"] == level]
+    print(f"{level} algebra: {len(filtered_rows)} problems")
+
+    rows = []
+    for prob in filtered_rows:
+        gold = extract_boxed(prob["solution"])
+        if not gold:
+            continue
+
+        # Format as chat prompt with hidden gold tag
+        prompt = (
+            f"Solve the following math problem. "
+            f"Show your work and put your final answer in \\boxed{{}}.\n\n"
+            f"{prob['problem']}"
+            f"<|gold|>{gold}<|/gold|>"
+        )
+
+        # Tokenize the prompt
+        text = tokenizer.apply_chat_template(
+            [{"role": "user", "content": prompt}],
+            tokenize=False,
+            add_generation_prompt=True,
+        )
+        prompt_ids = tokenizer.encode(text, add_special_tokens=False)
+
+        rows.append(
+            {
+                "input_ids": prompt_ids,
+                "labels": [-100] * len(prompt_ids),
+                "attention_mask": [1] * len(prompt_ids),
+            }
+        )
+
+    out = Dataset.from_list(rows)
+    out_dir = f"./data/math_rl_{level.lower().replace(' ', '')}"
+    out.save_to_disk(out_dir)
+    print(f"Saved {len(out)} examples to {out_dir}")
+    if rows:
+        print(
+            f"Prompt length range: {min(len(r['input_ids']) for r in rows)}"
+            f"-{max(len(r['input_ids']) for r in rows)}"
+        )
+
+
+if __name__ == "__main__":
+    main()

src/axolotl/integrations/hatchery/examples/tinker_rl.yaml

@@ -0,0 +1,47 @@
+# RL (GRPO): hendrycks_math Level 1 via Tinker with Qwen3-8B
+#
+# Prep:
+#   python src/axolotl/integrations/hatchery/examples/prep_math_rl.py
+#
+# Run:
+#   export TINKER_API_KEY="your-key"
+#   axolotl train src/axolotl/integrations/hatchery/examples/tinker_rl.yaml
+
+base_model: Qwen/Qwen3-8B
+
+plugins:
+  - axolotl.integrations.hatchery.HatcheryPlugin
+
+hatchery:
+  backend: tinker
+  lora_rank: 16
+  loss_fn: importance_sampling
+  max_sample_tokens: 2048
+  sample_temperature: 0.7
+  num_samples: 4
+  pipeline: true
+  save_steps: 5
+  reward_funcs:
+    - axolotl.integrations.hatchery.rewards.math_reward.math_reward
+
+datasets:
+  - path: ./data/math_rl_level1
+    ds_type: arrow
+    type: completion
+
+sequence_len: 2048
+
+learning_rate: 5.0e-5
+optimizer: adamw_torch
+adam_beta1: 0.9
+adam_beta2: 0.95
+weight_decay: 0.01
+max_grad_norm: 1.0
+
+max_steps: 10
+num_epochs: 1
+micro_batch_size: 1
+gradient_accumulation_steps: 1
+logging_steps: 1
+
+output_dir: ./outputs/tinker-rl-math

src/axolotl/integrations/hatchery/examples/tinker_sft.yaml

@@ -0,0 +1,42 @@
+# SFT: KIMI-K2 thinking data via Tinker remote API with Qwen3-8B
+#
+# Usage:
+#   export TINKER_API_KEY="your-key"
+#   axolotl train src/axolotl/integrations/hatchery/examples/tinker_sft.yaml
+
+base_model: Qwen/Qwen3-8B
+
+plugins:
+  - axolotl.integrations.hatchery.HatcheryPlugin
+
+hatchery:
+  backend: tinker
+  lora_rank: 16
+  loss_fn: cross_entropy
+  pipeline: true
+  save_steps: 10
+
+datasets:
+  - path: TeichAI/kimi-k2-thinking-1000x
+    split: train[:50]
+    type: chat_template
+    chat_template: qwen3
+    split_thinking: true
+
+chat_template: qwen3
+sequence_len: 2048
+
+learning_rate: 3.0e-4
+optimizer: adamw_torch
+adam_beta1: 0.9
+adam_beta2: 0.95
+weight_decay: 0.01
+max_grad_norm: 1.0
+
+num_epochs: 1
+max_steps: 20
+micro_batch_size: 2
+gradient_accumulation_steps: 1
+logging_steps: 1
+
+output_dir: ./outputs/tinker-sft

src/axolotl/integrations/hatchery/plugin.py

@@ -0,0 +1,147 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Axolotl AI
+# Licensed under the Apache License, Version 2.0
+
+"""Axolotl plugin that routes training to a remote Hatchery/Tinker API."""
+
+from __future__ import annotations
+
+import torch
+from peft import PeftModel
+from transformers import AutoConfig, PreTrainedModel, Trainer
+
+from axolotl.integrations.base import BasePlugin
+from axolotl.utils.dict import DictDefault
+from axolotl.utils.logging import get_logger
+
+LOG = get_logger(__name__)
+
+
+class HatcheryPlugin(BasePlugin):
+    """Plugin that replaces local training with remote API calls.
+
+    Activated by adding to the axolotl YAML:
+
+        plugins:
+          - axolotl.integrations.hatchery.HatcheryPlugin
+
+        hatchery:
+          backend: tinker  # or "hatchery"
+          lora_rank: 32
+          loss_fn: cross_entropy
+          # ... see HatcheryConfig for full options
+    """
+
+    def get_input_args(self) -> str:
+        return "axolotl.integrations.hatchery.args.HatcheryArgs"
+
+    def register(self, cfg: dict):
+        """Auto-set config values needed for remote training."""
+        if cfg.get("remove_unused_columns") is None:
+            cfg["remove_unused_columns"] = False
+
+    def pre_model_load(self, cfg: DictDefault):
+        """Replace model loading with a tiny stub."""
+        hcfg = cfg.hatchery or {}
+        backend = (
+            hcfg.get("backend", "tinker")
+            if isinstance(hcfg, dict)
+            else getattr(hcfg, "backend", "tinker")
+        )
+        LOG.info(
+            f"Hatchery plugin active: training dispatched to remote "
+            f"{backend} API. Skipping local model weight loading."
+        )
+
+        from axolotl.loaders import ModelLoader
+
+        def _stub_build_model(loader_self) -> bool:
+            base_model = loader_self.cfg.base_model
+            LOG.info(f"Skipping model weight loading for: {base_model}")
+
+            config = AutoConfig.from_pretrained(
+                base_model,
+                trust_remote_code=loader_self.cfg.get("trust_remote_code", False),
+            )
+
+            class _Stub(PreTrainedModel):
+                config_class = type(config)
+                _no_split_modules: list[str] = []
+                supports_gradient_checkpointing = False
+
+                def __init__(self, cfg):
+                    super().__init__(cfg)
+                    vocab_size = getattr(cfg, "vocab_size", 32000)
+                    self.embed_tokens = torch.nn.Embedding(vocab_size, 1)
+
+                def get_input_embeddings(self):
+                    return self.embed_tokens
+
+                def set_input_embeddings(self, value):
+                    pass
+
+                def get_output_embeddings(self):
+                    return None
+
+            loader_self.model = _Stub(config)
+            return True
+
+        ModelLoader._build_model = _stub_build_model  # type: ignore[method-assign,assignment]
+
+    def get_trainer_cls(self, cfg: DictDefault) -> type[Trainer] | None:
+        """Return the appropriate remote trainer class."""
+        hcfg = cfg.hatchery
+        loss_fn = getattr(hcfg, "loss_fn", "cross_entropy") if hcfg else "cross_entropy"
+
+        if loss_fn in ("importance_sampling", "ppo", "cispo", "dro"):
+            from .rl_trainer import HatcheryRLTrainer
+
+            return HatcheryRLTrainer
+
+        from .trainer import HatcheryTrainer
+
+        return HatcheryTrainer
+
+    def post_model_load(self, cfg: DictDefault, model: PreTrainedModel | PeftModel):
+        model._hatchery_remote = True
+
+    def post_train(self, cfg: DictDefault, model: PreTrainedModel | PeftModel):
+        LOG.info(
+            "Hatchery: skipping local model save (weights are on remote API). "
+            "Use `tinker checkpoint download` or hatchery CLI to retrieve."
+        )
+
+    def post_trainer_create(self, cfg: DictDefault, trainer: Trainer):
+        """Inject hatchery config + axolotl training params into the trainer."""
+        from .args import HatcheryConfig
+        from .rl_trainer import HatcheryRLTrainer
+        from .trainer import HatcheryTrainer
+
+        if not isinstance(trainer, (HatcheryTrainer, HatcheryRLTrainer)):
+            return
+
+        hcfg = cfg.hatchery
+        if isinstance(hcfg, dict):
+            hatchery_config = HatcheryConfig(**hcfg)
+        elif hcfg is None:
+            hatchery_config = HatcheryConfig()
+        else:
+            hatchery_config = hcfg
+
+        trainer.hatchery_args = hatchery_config
+        trainer._base_model_name = cfg.base_model
+
+        # Pull standard training params from axolotl config so they
+        # don't need to be duplicated under hatchery:
+        trainer._optim_params = {
+            "learning_rate": cfg.learning_rate
+            if cfg.learning_rate is not None
+            else 1e-4,
+            "beta1": cfg.adam_beta1 if cfg.adam_beta1 is not None else 0.9,
+            "beta2": cfg.adam_beta2 if cfg.adam_beta2 is not None else 0.95,
+            "eps": cfg.adam_epsilon if cfg.adam_epsilon is not None else 1e-12,
+            "weight_decay": cfg.weight_decay if cfg.weight_decay is not None else 0.0,
+            "grad_clip_norm": cfg.max_grad_norm
+            if cfg.max_grad_norm is not None
+            else 0.0,
+        }

src/axolotl/integrations/hatchery/rewards/__init__.py

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Axolotl AI
+# Licensed under the Apache License, Version 2.0

src/axolotl/integrations/hatchery/rewards/math_reward.py

@@ -0,0 +1,78 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Axolotl AI
+# Licensed under the Apache License, Version 2.0
+
+"""Math reward function for hendrycks_math GRPO training.
+
+Uses math_verify for robust answer comparison. Falls back to
+exact string match of \\boxed{} content only when math_verify
+is unavailable.
+"""
+
+from __future__ import annotations
+
+import logging
+import re
+
+LOG = logging.getLogger(__name__)
+
+
+def extract_boxed(text: str) -> str | None:
+    """Extract \\boxed{...} answer handling nested braces."""
+    match = re.search(r"\\boxed\{", text)
+    if not match:
+        return None
+    start = match.end()
+    depth = 1
+    i = start
+    while i < len(text) and depth > 0:
+        if text[i] == "{":
+            depth += 1
+        elif text[i] == "}":
+            depth -= 1
+        i += 1
+    return text[start : i - 1] if depth == 0 else None
+
+
+def math_reward(prompts: list[str], completions: list[str], **kwargs) -> list[float]:
+    """Score completions by checking if \\boxed{} answer matches the gold answer.
+
+    The gold answer is extracted from the prompt (appended as a hidden
+    tag by the dataset preprocessing). Format:
+      ... <|gold|>ANSWER<|/gold|>
+    """
+    rewards = []
+    for prompt, completion in zip(prompts, completions, strict=True):
+        gold_match = re.search(r"<\|gold\|>(.*?)<\|/gold\|>", prompt)
+        if not gold_match:
+            rewards.append(0.0)
+            continue
+
+        gold_answer = gold_match.group(1).strip()
+        pred_answer = extract_boxed(completion)
+
+        if pred_answer is None:
+            rewards.append(0.0)
+            continue
+
+        verified = None
+        try:
+            from math_verify import parse, verify
+
+            gold_parsed = parse(gold_answer)
+            pred_parsed = parse(pred_answer)
+            verified = verify(gold_parsed, pred_parsed)
+        except Exception:
+            LOG.debug(
+                "math_verify unavailable or failed, using string fallback",
+                exc_info=True,
+            )
+
+        if verified is not None:
+            rewards.append(1.0 if verified else 0.0)
+        elif pred_answer.strip() == gold_answer.strip():
+            rewards.append(1.0)
+        else:
+            rewards.append(0.0)
+
+    return rewards

src/axolotl/integrations/hatchery/rl_trainer.py

@@ -0,0 +1,409 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Axolotl AI
+# Licensed under the Apache License, Version 2.0
+
+"""Remote RL trainer (GRPO/PPO) using Tinker or Hatchery API.
+
+Full RL loop per step:
+  1. Extract prompts from dataset batch
+  2. Sample N completions per prompt via remote SamplingClient
+  3. Score completions with local reward functions
+  4. Compute GRPO-style advantages (per-group normalization)
+  5. Send (prompt+completion, logprobs, advantages) as forward_backward
+  6. Optimizer step
+"""
+
+from __future__ import annotations
+
+import importlib
+import inspect
+import re
+import time
+from typing import Any, Callable, Optional
+
+import torch
+from transformers.trainer_utils import TrainOutput
+
+from axolotl.core.trainers.base import AxolotlTrainer
+from axolotl.utils.logging import get_logger
+
+from .args import HatcheryConfig
+from .data import batch_to_datums_rl, datums_to_tinker
+from .trainer import _create_training_client
+
+LOG = get_logger(__name__)
+
+
+def _load_reward_func(fqn: str) -> Callable:
+    """Load a reward function from a fully qualified name like 'module.func'."""
+    module_path = ".".join(fqn.split(".")[:-1])
+    func_name = fqn.split(".")[-1]
+    mod = importlib.import_module(module_path)
+    func = getattr(mod, func_name)
+    if len(inspect.signature(func).parameters) < 2:
+        raise ValueError(f"Reward function {fqn} must accept (prompts, completions)")
+    return func
+
+
+class HatcheryRLTrainer(AxolotlTrainer):
+    """Remote RL trainer using Tinker/Hatchery for sampling and training."""
+
+    hatchery_args: Optional[HatcheryConfig]
+    _base_model_name: Optional[str]
+    _training_client: Any
+    _reward_functions: list[Callable]
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.hatchery_args = None
+        self._base_model_name = None
+        self._training_client = None
+        self._reward_functions = []
+
+    def _ensure_reward_functions(self):
+        if self._reward_functions:
+            return
+        args = self.hatchery_args
+        if not args or not args.reward_funcs:
+            raise ValueError(
+                "No reward functions configured. Set hatchery.reward_funcs "
+                "in YAML, e.g. reward_funcs: ['my_module.my_reward']"
+            )
+        for fqn in args.reward_funcs:
+            self._reward_functions.append(_load_reward_func(fqn))
+        LOG.info(f"Loaded {len(self._reward_functions)} reward function(s)")
+
+    def _get_training_client(self):
+        if self._training_client is not None:
+            return self._training_client
+
+        self._training_client = _create_training_client(
+            self.hatchery_args, self._base_model_name
+        )
+        LOG.info(
+            f"Remote RL session created: backend={self.hatchery_args.backend}, "
+            f"model={self._base_model_name}, rank={self.hatchery_args.lora_rank}"
+        )
+        return self._training_client
+
+    def _sample_completions(self, prompt_ids_list: list[list[int]]):
+        """Sample completions for prompts via remote API."""
+        import tinker.types as tt
+
+        tc = self._get_training_client()
+        args = self.hatchery_args
+        assert args is not None  # validated by _get_training_client
+        results = []
+
+        sc = tc.save_weights_and_get_sampling_client()
+
+        for prompt_ids in prompt_ids_list:
+            if hasattr(sc, "sampling_session_id"):
+                sample_result = sc.sample(
+                    prompt_ids,
+                    max_tokens=args.max_sample_tokens,
+                    temperature=args.sample_temperature,
+                    n=args.num_samples,
+                ).result(timeout=args.future_timeout)
+            else:
+                mi = tt.ModelInput.from_ints(prompt_ids)
+                sp = tt.SamplingParams(
+                    max_tokens=args.max_sample_tokens,
+                    temperature=args.sample_temperature,
+                    top_p=0.95,
+                    top_k=-1,
+                )
+                sample_result = sc.sample(
+                    prompt=mi,
+                    num_samples=args.num_samples,
+                    sampling_params=sp,
+                ).result(timeout=args.future_timeout)
+
+            sequences = (
+                sample_result.sequences
+                if hasattr(sample_result, "sequences")
+                else sample_result.get("sequences", [])
+            )
+            for seq in sequences:
+                tokens = (
+                    list(seq.tokens)
+                    if hasattr(seq, "tokens")
+                    else seq.get("tokens", [])
+                )
+                logprobs = (
+                    list(seq.logprobs)
+                    if hasattr(seq, "logprobs") and seq.logprobs
+                    else seq.get("logprobs", [])
+                )
+                results.append(
+                    {
+                        "tokens": list(prompt_ids) + tokens,
+                        "completion_tokens": tokens,
+                        "logprobs": logprobs,
+                        "prompt_len": len(prompt_ids),
+                    }
+                )
+
+        return results
+
+    def _compute_rewards(
+        self, prompts: list[str], completions: list[str]
+    ) -> list[float]:
+        total_rewards = [0.0] * len(completions)
+        for reward_fn in self._reward_functions:
+            rewards = reward_fn(prompts, completions)
+            for i, r in enumerate(rewards):
+                total_rewards[i] += r
+        return total_rewards
+
+    @staticmethod
+    def _compute_advantages(rewards: list[float], group_size: int) -> list[float]:
+        advantages = []
+        for i in range(0, len(rewards), group_size):
+            group = rewards[i : i + group_size]
+            mean = sum(group) / len(group)
+            var = sum((r - mean) ** 2 for r in group) / max(len(group), 1)
+            std = var**0.5 if var > 1e-8 else 1.0
+            advantages.extend([(r - mean) / std for r in group])
+        return advantages
+
+    def _do_optim_step(self):
+        import tinker.types as tt
+
+        tc = self._get_training_client()
+        return tc.optim_step(tt.AdamParams(**self._optim_params))
+
+    def train(
+        self,
+        resume_from_checkpoint: Optional[str] = None,
+        trial: Any = None,
+        ignore_keys_for_eval: Optional[list[str]] = None,
+        **kwargs,
+    ) -> TrainOutput:
+        args = self.hatchery_args
+        if args is None:
+            raise RuntimeError("hatchery_args not configured")
+
+        self._ensure_reward_functions()
+
+        train_dataloader = self.get_train_dataloader()
+        num_train_epochs = int(self.args.num_train_epochs)
+        max_steps = self.args.max_steps if self.args.max_steps > 0 else 1000
+
+        LOG.info(
+            f"Remote RL training: max_steps={max_steps}, "
+            f"loss_fn={args.loss_fn}, samples/prompt={args.num_samples}"
+        )
+
+        self.state.max_steps = max_steps
+        self.state.num_train_epochs = num_train_epochs
+        self.state.is_local_process_zero = True
+        self.state.is_world_process_zero = True
+
+        self.control = self.callback_handler.on_train_begin(
+            self.args,
+            self.state,
+            self.control,  # type: ignore[has-type]
+        )
+
+        tokenizer = self.processing_class
+        global_step = 0
+        total_loss = 0.0
+        total_reward = 0.0
+        start_time = time.time()
+
+        for _epoch in range(num_train_epochs):
+            if global_step >= max_steps:
+                break
+
+            for batch in train_dataloader:
+                if global_step >= max_steps:
+                    break
+
+                self.control = self.callback_handler.on_step_begin(
+                    self.args, self.state, self.control
+                )
+
+                prompt_ids_batch = batch["input_ids"]
+                # Full prompt text (with gold tag) for reward scoring
+                prompt_texts = tokenizer.batch_decode(
+                    prompt_ids_batch, skip_special_tokens=False
+                )
+
+                # Strip <|gold|>...<|/gold|> from token ids before
+                # sending to the model for sampling — the gold answer
+                # must only be visible to the local reward function.
+                sampling_prompts = []
+                for prompt_text in prompt_texts:
+                    clean = re.sub(r"<\|gold\|>.*?<\|/gold\|>", "", prompt_text)
+                    clean_ids = tokenizer.encode(clean, add_special_tokens=False)
+                    sampling_prompts.append(clean_ids)
+
+                # 1. Sample completions (without gold answer)
+                t0 = time.time()
+                samples = self._sample_completions(sampling_prompts)
+                t_sample = time.time() - t0
+
+                if not samples:
+                    LOG.warning("No samples generated, skipping step")
+                    continue
+                LOG.info(
+                    f"Sampled {len(samples)} completions, "
+                    f"avg_len={sum(len(s['completion_tokens']) for s in samples) / len(samples):.0f}tok"
+                )
+
+                # 2. Decode and score
+                completion_texts = [
+                    tokenizer.decode(s["completion_tokens"], skip_special_tokens=False)
+                    for s in samples
+                ]
+                sample_prompts = []
+                for prompt_text in prompt_texts:
+                    sample_prompts.extend([prompt_text] * args.num_samples)
+
+                rewards = self._compute_rewards(sample_prompts, completion_texts)
+
+                # 3. GRPO advantages
+                advantages_list = self._compute_advantages(
+                    rewards, group_size=args.num_samples
+                )
+
+                # 4. Build training data
+                all_datums = []
+                for i, sample in enumerate(samples):
+                    full_tokens = sample["tokens"]
+                    prompt_len = sample["prompt_len"]
+                    seq_len = len(full_tokens)
+
+                    input_ids = torch.tensor([full_tokens], dtype=torch.long)
+                    labels = torch.full((1, seq_len), -100, dtype=torch.long)
+                    labels[0, prompt_len:] = torch.tensor(full_tokens[prompt_len:])
+
+                    logprobs_t = torch.zeros(1, seq_len)
+                    if sample["logprobs"]:
+                        lp = sample["logprobs"][: seq_len - prompt_len]
+                        logprobs_t[0, prompt_len : prompt_len + len(lp)] = torch.tensor(
+                            lp
+                        )
+
+                    adv_t = torch.zeros(1, seq_len)
+                    adv_t[0, prompt_len:] = advantages_list[i]
+
+                    all_datums.extend(
+                        batch_to_datums_rl(input_ids, labels, logprobs_t, adv_t)
+                    )
+
+                # 5. Forward backward (one datum at a time for memory) + optim
+                t0 = time.time()
+                tc = self._get_training_client()
+                step_loss = 0.0
+                for datum in all_datums:
+                    fb_future = tc.forward_backward(
+                        datums_to_tinker([datum]),
+                        loss_fn=args.loss_fn,
+                        loss_fn_config=args.loss_fn_config,
+                    )
+                    fb_result = fb_future.result(timeout=args.future_timeout)
+                    if hasattr(fb_result, "metrics"):
+                        step_loss += float(
+                            (fb_result.metrics or {}).get("loss:sum", 0.0)
+                        )
+                    elif isinstance(fb_result, dict):
+                        step_loss += float(
+                            fb_result.get("metrics", {}).get("loss:sum", 0.0)
+                        )
+                optim_future = self._do_optim_step()
+                if not args.pipeline:
+                    optim_future.result(timeout=args.future_timeout)
+                t_train = time.time() - t0
+
+                mean_reward = sum(rewards) / len(rewards)
+                accuracy = sum(1 for r in rewards if r > 0) / len(rewards)
+                mean_adv = sum(abs(a) for a in advantages_list) / len(advantages_list)
+                global_step += 1
+                total_loss += step_loss
+                total_reward += mean_reward
+                self.state.global_step = global_step
+
+                log_interval = self.args.logging_steps or 1
+                if global_step % log_interval == 0:
+                    elapsed = time.time() - start_time
+                    LOG.info(
+                        f"[step {global_step}/{max_steps}] "
+                        f"acc={accuracy:.2f} reward={mean_reward:.3f} "
+                        f"|adv|={mean_adv:.3f} loss:sum={step_loss:.1f} "
+                        f"sample={t_sample:.1f}s train={t_train:.1f}s "
+                        f"{elapsed / global_step:.1f}s/step"
+                    )
+                    self.log(
+                        {
+                            "loss": step_loss,
+                            "reward": mean_reward,
+                            "accuracy": accuracy,
+                            "mean_abs_advantage": mean_adv,
+                            "learning_rate": self._optim_params["learning_rate"],
+                        }
+                    )
+
+                if args.save_steps and global_step % args.save_steps == 0:
+                    self._save_remote_checkpoint(global_step)
+
+                self.control = self.callback_handler.on_step_end(
+                    self.args, self.state, self.control
+                )
+                if self.control.should_training_stop:
+                    break
+
+            if self.control.should_training_stop:
+                break
+
+        if global_step > 0:
+            self._save_remote_checkpoint(global_step, name="final")
+
+        elapsed = time.time() - start_time
+        avg_loss = total_loss / max(global_step, 1)
+        avg_reward = total_reward / max(global_step, 1)
+
+        LOG.info(
+            f"RL training complete: {global_step} steps, {elapsed:.1f}s, "
+            f"avg_reward={avg_reward:.4f}"
+        )
+
+        self.control = self.callback_handler.on_train_end(
+            self.args, self.state, self.control
+        )
+
+        return TrainOutput(
+            global_step=global_step,
+            training_loss=avg_loss,
+            metrics={
+                "train_loss": avg_loss,
+                "train_reward": avg_reward,
+                "train_runtime": elapsed,
+            },
+        )
+
+    def _save_remote_checkpoint(self, step: int, name: Optional[str] = None):
+        tc = self._get_training_client()
+        args = self.hatchery_args
+        assert args is not None  # validated by _get_training_client
+        ckpt_name = name or f"{args.save_name_prefix}-{step:06d}"
+        try:
+            future = tc.save_state(ckpt_name)
+            future.result(timeout=args.future_timeout)
+            LOG.info(f"Remote checkpoint saved: {ckpt_name}")
+        except Exception:
+            LOG.exception(f"Failed to save checkpoint {ckpt_name}")
+            if name == "final":
+                raise
+
+    def save_model(self, output_dir=None, _internal_call=False):
+        self._save_remote_checkpoint(
+            step=self.state.global_step,
+            name=output_dir or "hf-save",
+        )
+
+    def compute_loss(self, model, inputs, return_outputs=False, **kwargs):
+        raise NotImplementedError(
+            "HatcheryRLTrainer uses remote API; compute_loss not called locally."
+        )

src/axolotl/integrations/hatchery/trainer.py

@@ -0,0 +1,327 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Axolotl AI
+# Licensed under the Apache License, Version 2.0
+
+"""Remote trainer that dispatches to Tinker or Hatchery API."""
+
+from __future__ import annotations
+
+import os
+import time
+from typing import Any, Optional
+
+import torch
+from transformers.trainer_utils import TrainOutput
+
+from axolotl.core.trainers.base import AxolotlTrainer
+from axolotl.utils.logging import get_logger
+
+from .args import HatcheryConfig
+from .data import batch_to_datums_sft, datums_to_tinker
+
+LOG = get_logger(__name__)
+
+
+def _extract_loss(result) -> float:
+    """Extract loss:sum from a forward_backward result.
+
+    Tinker's cross_entropy (and other losses) return the SUM of per-token
+    losses, not the mean. This is by design — it lets users control
+    normalization via the weights tensor. The trainer logs this raw sum;
+    users who want per-token loss should divide by number of active tokens.
+    """
+    if hasattr(result, "metrics"):
+        metrics = result.metrics or {}
+        return float(metrics.get("loss:sum", metrics.get("loss", 0.0)))
+    if isinstance(result, dict):
+        metrics = result.get("metrics", {})
+        return float(metrics.get("loss:sum", metrics.get("loss", 0.0)))
+    return 0.0
+
+
+def _create_training_client(args: HatcheryConfig, base_model: str):
+    """Create a training client for either Tinker or Hatchery backend."""
+    if args.backend == "tinker":
+        import tinker
+
+        api_key = args.api_key or os.environ.get("TINKER_API_KEY")
+        if not api_key:
+            raise ValueError(
+                "Tinker API key required. Set `hatchery.api_key` in config "
+                "or TINKER_API_KEY env var."
+            )
+        os.environ["TINKER_API_KEY"] = api_key
+
+        service = tinker.ServiceClient(project_id=args.project_id)
+        return service.create_lora_training_client(
+            base_model=base_model,
+            rank=args.lora_rank,
+            train_mlp=args.train_mlp,
+            train_attn=args.train_attn,
+            train_unembed=args.train_unembed,
+        )
+
+    from hatchery.core.client import HatcheryClient
+
+    base_url = args.base_url or os.environ.get("HATCHERY_URL", "http://127.0.0.1:8420")
+    token = args.api_key or os.environ.get("HATCHERY_API_KEY", "dev")
+
+    client = HatcheryClient(base_url=base_url, token=token, timeout=args.future_timeout)
+    return client.create_lora_training_client(
+        base_model=base_model,
+        rank=args.lora_rank,
+        train_attn=args.train_attn,
+        train_mlp=args.train_mlp,
+        train_unembed=args.train_unembed,
+    )
+
+
+class HatcheryTrainer(AxolotlTrainer):
+    """Trainer that sends preprocessed batches to a remote training API.
+
+    Replaces local forward/backward with remote API calls to Tinker or
+    Hatchery. Uses axolotl's full data preprocessing pipeline (tokenization,
+    chat templates, packing, etc.) but offloads compute to remote GPUs.
+    """
+
+    hatchery_args: Optional[HatcheryConfig]
+    _base_model_name: Optional[str]
+    _training_client: Any
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.hatchery_args = None
+        self._base_model_name = None
+        self._training_client = None
+
+    def _get_training_client(self):
+        """Lazily create the remote training session."""
+        if self._training_client is not None:
+            return self._training_client
+
+        args = self.hatchery_args
+        if args is None:
+            raise RuntimeError(
+                "HatcheryTrainer.hatchery_args not set. "
+                "Ensure the HatcheryPlugin is registered."
+            )
+
+        base_model = self._base_model_name
+        if not base_model:
+            raise RuntimeError("HatcheryTrainer._base_model_name not set.")
+
+        self._training_client = _create_training_client(args, base_model)
+
+        LOG.info(
+            f"Remote training session created: backend={args.backend}, "
+            f"model={base_model}, rank={args.lora_rank}"
+        )
+        return self._training_client
+
+    def _send_batch(self, batch: dict[str, torch.Tensor]):
+        """Convert batch to datums and send forward_backward to remote.
+
+        Returns (future, n_active_tokens) where n_active_tokens counts
+        the completion tokens in this batch (for loss normalization).
+        """
+        input_ids = batch["input_ids"]
+        labels = batch["labels"]
+        attention_mask = batch.get("attention_mask")
+
+        n_active = int((labels[:, 1:] != -100).sum().item())
+        datums = batch_to_datums_sft(input_ids, labels, attention_mask)
+
+        tc = self._get_training_client()
+        args = self.hatchery_args
+        assert args is not None  # validated by _get_training_client
+        send_datums = datums_to_tinker(datums)
+
+        future = tc.forward_backward(
+            send_datums,
+            loss_fn=args.loss_fn,
+            loss_fn_config=args.loss_fn_config,
+        )
+        return future, n_active
+
+    def _do_optim_step(self):
+        """Send optimizer step to remote using axolotl's training params."""
+        import tinker.types as tt
+
+        tc = self._get_training_client()
+        return tc.optim_step(tt.AdamParams(**self._optim_params))
+
+    def train(
+        self,
+        resume_from_checkpoint: Optional[str] = None,
+        trial: Any = None,
+        ignore_keys_for_eval: Optional[list[str]] = None,
+        **kwargs,
+    ) -> TrainOutput:
+        """Main training loop — sends batches to remote API."""
+        args = self.hatchery_args
+        if args is None:
+            raise RuntimeError("hatchery_args not configured")
+
+        train_dataloader = self.get_train_dataloader()
+        num_batches = len(train_dataloader)
+
+        grad_accum = self.args.gradient_accumulation_steps
+        num_train_epochs = int(self.args.num_train_epochs)
+        steps_per_epoch = max(num_batches // grad_accum, 1)
+        max_steps = (
+            self.args.max_steps
+            if self.args.max_steps > 0
+            else steps_per_epoch * num_train_epochs
+        )
+
+        LOG.info(
+            f"Remote training: {num_batches} batches/epoch, "
+            f"{grad_accum} grad_accum, {max_steps} max steps, "
+            f"{num_train_epochs} epochs"
+        )
+
+        self.state.max_steps = max_steps
+        self.state.num_train_epochs = num_train_epochs
+        self.state.is_local_process_zero = True
+        self.state.is_world_process_zero = True
+
+        self.control = self.callback_handler.on_train_begin(
+            self.args,
+            self.state,
+            self.control,  # type: ignore[has-type]
+        )
+
+        global_step = 0
+        total_loss = 0.0
+        start_time = time.time()
+
+        for _epoch in range(num_train_epochs):
+            if global_step >= max_steps:
+                break
+
+            self.control = self.callback_handler.on_epoch_begin(
+                self.args, self.state, self.control
+            )
+
+            pending_fb_futures = []
+            accum_count = 0
+
+            for batch_idx, batch in enumerate(train_dataloader):
+                if global_step >= max_steps:
+                    break
+
+                self.control = self.callback_handler.on_step_begin(
+                    self.args, self.state, self.control
+                )
+
+                fb_future, n_active = self._send_batch(batch)
+                pending_fb_futures.append((fb_future, n_active))
+                accum_count += 1
+
+                if accum_count >= grad_accum:
+                    step_loss_sum = 0.0
+                    step_active = 0
+                    for fut, n_act in pending_fb_futures:
+                        result = fut.result(timeout=args.future_timeout)
+                        step_loss_sum += _extract_loss(result)
+                        step_active += n_act
+
+                    optim_future = self._do_optim_step()
+                    if not args.pipeline:
+                        optim_future.result(timeout=args.future_timeout)
+
+                    step_loss = (
+                        step_loss_sum / step_active
+                        if step_active > 0
+                        else step_loss_sum
+                    )
+
+                    global_step += 1
+                    total_loss += step_loss
+                    self.state.global_step = global_step
+                    self.state.epoch = _epoch + (batch_idx + 1) / num_batches
+
+                    log_interval = self.args.logging_steps or 1
+                    if global_step % log_interval == 0:
+                        elapsed = time.time() - start_time
+                        avg_loss = total_loss / global_step
+                        LOG.info(
+                            f"[step {global_step}/{max_steps}] "
+                            f"loss/tok={step_loss:.4f} avg={avg_loss:.4f} "
+                            f"active={step_active} "
+                            f"{elapsed / global_step:.2f}s/step"
+                        )
+                        self.log(
+                            {
+                                "loss": step_loss,
+                                "learning_rate": self._optim_params["learning_rate"],
+                                "epoch": self.state.epoch,
+                            }
+                        )
+
+                    if args.save_steps and global_step % args.save_steps == 0:
+                        self._save_remote_checkpoint(global_step)
+
+                    self.control = self.callback_handler.on_step_end(
+                        self.args, self.state, self.control
+                    )
+
+                    pending_fb_futures = []
+                    accum_count = 0
+
+                    if self.control.should_training_stop:
+                        break
+
+            self.control = self.callback_handler.on_epoch_end(
+                self.args, self.state, self.control
+            )
+            if self.control.should_training_stop:
+                break
+
+        if global_step > 0:
+            self._save_remote_checkpoint(global_step, name="final")
+
+        elapsed = time.time() - start_time
+        avg_loss = total_loss / max(global_step, 1)
+
+        LOG.info(
+            f"Training complete: {global_step} steps, {elapsed:.1f}s total, "
+            f"{elapsed / max(global_step, 1):.2f}s/step, avg_loss={avg_loss:.4f}"
+        )
+
+        self.control = self.callback_handler.on_train_end(
+            self.args, self.state, self.control
+        )
+
+        return TrainOutput(
+            global_step=global_step,
+            training_loss=avg_loss,
+            metrics={"train_loss": avg_loss, "train_runtime": elapsed},
+        )
+
+    def _save_remote_checkpoint(self, step: int, name: Optional[str] = None):
+        """Save a checkpoint on the remote service."""
+        tc = self._get_training_client()
+        args = self.hatchery_args
+        assert args is not None  # validated by _get_training_client
+        ckpt_name = name or f"{args.save_name_prefix}-{step:06d}"
+        try:
+            future = tc.save_state(ckpt_name)
+            future.result(timeout=args.future_timeout)
+            LOG.info(f"Remote checkpoint saved: {ckpt_name}")
+        except Exception:
+            LOG.exception(f"Failed to save checkpoint {ckpt_name}")
+            if name == "final":
+                raise
+
+    def save_model(self, output_dir=None, _internal_call=False):
+        """Delegate to remote checkpoint save so HF callbacks create checkpoints."""
+        self._save_remote_checkpoint(
+            step=self.state.global_step,
+            name=output_dir or "hf-save",
+        )
+
+    def compute_loss(self, model, inputs, return_outputs=False, **kwargs):
+        raise NotImplementedError(
+            "HatcheryTrainer uses remote API; compute_loss should not be called."
+        )

src/axolotl/integrations/kd/README.md

@@ -11,7 +11,7 @@ kd_ce_alpha: 0.1
 kd_alpha: 0.9
 kd_temperature: 1.0
 
-torch_compile: True  # torch>=2.6.0, recommended to reduce vram
+torch_compile: True  # recommended to reduce vram
 
 datasets:
   - path: ...

src/axolotl/integrations/kernels/libs/scattermoe_lora/__init__.py

@@ -2,35 +2,17 @@
 # Copyright (c) Axolotl AI
 # Licensed under the Apache License, Version 2.0
 
-from .lora_layout import (
+from . import layers
-    peft_down_proj_lora_to_scattermoe,
+from .lora_ops import ParallelExperts
-    peft_lora_B_to_scattermoe,
+from .parallel_experts import flatten_sort_count, parallel_linear
-    peft_lora_to_scattermoe,
+from .parallel_linear_lora import ScatterMoELoRA, parallel_linear_lora
-    validate_scattermoe_lora_shapes,
-)
 
 __all__ = [
-    "peft_down_proj_lora_to_scattermoe",
+    "layers",
-    "peft_lora_B_to_scattermoe",
+    "ParallelExperts",
-    "peft_lora_to_scattermoe",
+    "flatten_sort_count",
-    "validate_scattermoe_lora_shapes",
+    "parallel_linear",
+    "ScatterMoELoRA",
+    "parallel_linear_lora",
+    "lora_ops",
 ]
-
-try:
-    from . import layers
-    from .lora_ops import ParallelExperts
-    from .parallel_experts import flatten_sort_count, parallel_linear
-    from .parallel_linear_lora import ScatterMoELoRA, parallel_linear_lora
-except ModuleNotFoundError as exc:
-    if exc.name != "triton":
-        raise
-else:
-    __all__ += [
-        "layers",
-        "ParallelExperts",
-        "flatten_sort_count",
-        "parallel_linear",
-        "ScatterMoELoRA",
-        "parallel_linear_lora",
-        "lora_ops",
-    ]

src/axolotl/integrations/kernels/libs/scattermoe_lora/layers.py

@@ -35,19 +35,46 @@ import torch
 from torch import nn
 from torch.nn import functional as F
 
-from .lora_layout import (
-    peft_down_proj_lora_to_scattermoe,
-    peft_lora_B_to_scattermoe,
-    peft_lora_to_scattermoe,
-)
 from .parallel_experts import flatten_sort_count, parallel_linear
 from .parallel_linear_lora import get_lora_params_from_wrapper, parallel_linear_lora
 
-__all__ = [
+# =============================================================================
-    "peft_down_proj_lora_to_scattermoe",
+# LoRA layout conversion utilities (peft <-> scattermoe)
-    "peft_lora_B_to_scattermoe",
+# =============================================================================
-    "peft_lora_to_scattermoe",
+
-]
+
+def peft_lora_B_to_scattermoe(peft_B, num_experts, rank):
+    """Convert peft rank-major lora_B ``[out, E*r]`` to scattermoe
+    expert-major ``[N, r*E]``.
+
+    peft reshapes B to ``[out, r, E]`` (rank-major).
+    scattermoe slices B as ``[:, e*r:(e+1)*r]`` (expert-major).
+    """
+    N = peft_B.shape[0]
+    return (
+        peft_B.reshape(N, rank, num_experts)
+        .permute(0, 2, 1)
+        .contiguous()
+        .reshape(N, num_experts * rank)
+    )
+
+
+def peft_lora_to_scattermoe(peft_A, peft_B, num_experts, rank):
+    """Convert peft LoRA weights to scattermoe layout.
+
+    peft >=0.19.1 assigns in/out features for 3D params such that
+    A and B already align with scattermoe's convention (no A<->B swap).
+    Only B needs rank-major → expert-major layout conversion.
+    """
+    smoe_A = peft_A
+    smoe_B = peft_lora_B_to_scattermoe(peft_B, num_experts, rank)
+    return smoe_A, smoe_B
+
+
+def peft_down_proj_lora_to_scattermoe(peft_A, peft_B, num_experts, rank):
+    """Deprecated alias for :func:`peft_lora_to_scattermoe`."""
+    return peft_lora_to_scattermoe(peft_A, peft_B, num_experts, rank)
+
 
 # =============================================================================
 # ParamWrapper unwrapping
@@ -137,7 +164,7 @@ def _unwrap_experts_lora(experts_module):
         if gup is not None:
             num_experts = gup.shape[0]
 
-    # Extract gate_up_proj LoRA
+    # Extract gate_up_proj LoRA (needs A<->B swap due to transposition)
     gup_lora = None
     gup_wrapper = wrappers.get("gate_up_proj")
     if gup_wrapper is not None:
@@ -146,7 +173,7 @@ def _unwrap_experts_lora(experts_module):
             rank = lora_A.shape[0] // num_experts
             gup_lora = _convert_smoe_lora(lora_A, lora_B, num_experts, rank, scaling)
 
-    # Extract down_proj LoRA
+    # Extract down_proj LoRA (needs A<->B swap due to transposition)
     down_lora = None
     down_wrapper = wrappers.get("down_proj")
     if down_wrapper is not None:

src/axolotl/integrations/kernels/libs/scattermoe_lora/lora_layout.py

@@ -1,78 +0,0 @@
-# SPDX-License-Identifier: Apache-2.0
-# Copyright (c) Axolotl AI
-# Licensed under the Apache License, Version 2.0
-
-"""Pure tensor layout helpers for ScatterMoE LoRA weights."""
-
-
-def peft_lora_B_to_scattermoe(peft_B, num_experts, rank):
-    """Convert peft rank-major lora_B ``[out, E*r]`` to scattermoe
-    expert-major ``[N, r*E]``.
-
-    peft reshapes B to ``[out, r, E]`` (rank-major).
-    scattermoe slices B as ``[:, e*r:(e+1)*r]`` (expert-major).
-    """
-    N = peft_B.shape[0]
-    return (
-        peft_B.reshape(N, rank, num_experts)
-        .permute(0, 2, 1)
-        .contiguous()
-        .reshape(N, num_experts * rank)
-    )
-
-
-def peft_lora_to_scattermoe(peft_A, peft_B, num_experts, rank):
-    """Convert peft LoRA weights to scattermoe layout.
-
-    peft operates on the parameter in its native storage layout ``[E, dim1, dim2]``
-    where ``out_features=dim1, in_features=dim2``. ScatterMoE transposes the
-    parameter (``W = param.transpose(2, 1)``), giving ``[E, dim2, dim1]`` with
-    ``K=dim2, N=dim1``.
-
-    peft gives:
-        lora_A ``[r*E, dim2]``, lora_B ``[dim1, r*E]``
-
-    scattermoe needs:
-        lora_A ``[r*E, K=dim2]``, lora_B ``[N=dim1, r*E]``
-
-    peft's A already matches ScatterMoE's A shape. Only B needs conversion from
-    peft's rank-major layout to ScatterMoE's expert-major layout.
-    """
-    smoe_A = peft_A
-    smoe_B = peft_lora_B_to_scattermoe(peft_B, num_experts, rank)
-
-    return smoe_A, smoe_B
-
-
-def peft_down_proj_lora_to_scattermoe(peft_A, peft_B, num_experts, rank):
-    """Deprecated alias for :func:`peft_lora_to_scattermoe`."""
-    return peft_lora_to_scattermoe(peft_A, peft_B, num_experts, rank)
-
-
-def validate_scattermoe_lora_shapes(expert_weights, lora_A, lora_B):
-    """Validate LoRA tensor layout before dispatching ScatterMoE kernels."""
-    E, K, N = expert_weights.shape
-    if lora_A.dim() != 2 or lora_B.dim() != 2:
-        raise ValueError(
-            "ScatterMoE LoRA expects 2D lora_A and lora_B tensors, got "
-            f"lora_A={tuple(lora_A.shape)} and lora_B={tuple(lora_B.shape)}."
-        )
-
-    if lora_A.size(0) % E != 0:
-        raise ValueError(
-            "ScatterMoE LoRA expects lora_A rows to be divisible by the number "
-            f"of experts ({E}), got lora_A={tuple(lora_A.shape)}."
-        )
-
-    rank = lora_A.size(0) // E
-    expected_A = (E * rank, K)
-    expected_B = (N, E * rank)
-    if tuple(lora_A.shape) != expected_A or tuple(lora_B.shape) != expected_B:
-        raise ValueError(
-            "Invalid ScatterMoE LoRA layout for expert_weights "
-            f"{tuple(expert_weights.shape)}. Expected lora_A={expected_A} and "
-            f"lora_B={expected_B}, got lora_A={tuple(lora_A.shape)} and "
-            f"lora_B={tuple(lora_B.shape)}. For PEFT target_parameters, keep "
-            "lora_A as [E*r, K] and only convert lora_B from rank-major to "
-            "expert-major layout."
-        )

src/axolotl/integrations/kernels/libs/scattermoe_lora/parallel_linear_lora.py

@@ -34,7 +34,6 @@ from .kernels.lora_ops import (
     scatter2scatter_lora,
     scatter2scatter_lora_dX,
 )
-from .lora_layout import validate_scattermoe_lora_shapes
 
 
 class ScatterMoELoRA(torch.autograd.Function):
@@ -423,6 +422,11 @@ def get_lora_params_from_wrapper(module) -> tuple:
     return lora_A, lora_B, scaling
 
 
+# =============================================================================
+# Drop-in replacement for parallel_linear
+# =============================================================================
+
+
 def parallel_linear_lora(
     inputs: torch.Tensor,
     expert_weights: torch.Tensor,
@@ -447,7 +451,6 @@ def parallel_linear_lora(
     Otherwise falls back to standard scatter2scatter.
     """
     if lora_A is not None and lora_B is not None:
-        validate_scattermoe_lora_shapes(expert_weights, lora_A, lora_B)
         return ScatterMoELoRA.apply(
             inputs,
             expert_weights,

src/axolotl/loaders/patch_manager.py

@@ -170,7 +170,6 @@ class PatchManager:
     def apply_post_model_load_patches(self, model: PreTrainedModel):
         """Apply patches that require the model instance."""
         self._apply_llama_flash_attn_patches(model)
-        self._apply_unsloth_patches(model)
         self._apply_lora_kernel_patch(model)
         self._apply_scaling_softmax_patch(model)
 
@@ -423,7 +422,16 @@ class PatchManager:
                     patch_gemma4_fused_attn,
                 )
 
-                patch_gemma4_fused_attn()
+                # Shared-KV side channel when activation checkpointing (PR #3611).
+                fsdp_cfg = self.cfg.fsdp_config
+                needs_shared_kv_workaround = (not self.inference) and bool(
+                    self.cfg.gradient_checkpointing
+                    or self.cfg.activation_offloading
+                    or (fsdp_cfg is not None and fsdp_cfg.activation_checkpointing)
+                )
+                patch_gemma4_fused_attn(
+                    install_shared_kv_workaround=needs_shared_kv_workaround
+                )
 
     @staticmethod
     def _fix_nemotron_h_conversion_mapping():
@@ -701,24 +709,10 @@ class PatchManager:
             )
 
             patch_fa_llama_cross_entropy()
-        elif self.cfg.unsloth_cross_entropy_loss:
-            from axolotl.monkeypatch.unsloth_ import integrate_cross_entropy_loss_patch
-
-            integrate_cross_entropy_loss_patch(model_type="llama")
-
         if self.cfg.flash_attn_rms_norm and self.has_flash_attn:
             from axolotl.monkeypatch.llama_attn_hijack_flash import patch_llama_rms_norm
 
             patch_llama_rms_norm()
-        elif self.cfg.unsloth_rms_norm:
-            from axolotl.monkeypatch.unsloth_ import patch_unsloth_layernorm
-
-            patch_unsloth_layernorm()
-
-        if self.cfg.unsloth_lora_qkv or self.cfg.unsloth_lora_o:
-            from axolotl.monkeypatch.unsloth_ import patch_self_attn_lora
-
-            patch_self_attn_lora()
 
     def _patch_llama_flash_attention(self):
         """Apply Flash Attention patches for LLaMA models."""
@@ -785,23 +779,6 @@ class PatchManager:
                 LOG.info("Patching with SwiGLU...")
                 replace_llama_mlp_with_swiglu(model)
 
-    def _apply_unsloth_patches(self, model):
-        """Apply unsloth optimization patches."""
-        if self.cfg.unsloth_lora_mlp:
-            from axolotl.monkeypatch.unsloth_ import integrate_lora_mlp_patch
-
-            integrate_lora_mlp_patch(peft_model=model)
-
-        if self.cfg.unsloth_lora_qkv or self.cfg.unsloth_lora_o:
-            from axolotl.monkeypatch.unsloth_ import integrate_lora_patch
-
-            integrate_lora_patch(peft_model=model, cfg=self.cfg)
-
-        if self.cfg.unsloth_rope:
-            from axolotl.monkeypatch.unsloth_ import integrate_rope_embeddings
-
-            integrate_rope_embeddings()
-
     def _apply_lora_kernel_patch(self, model):
         """Apply LoRA kernel patches."""
         if (

src/axolotl/loaders/processor.py

@@ -23,6 +23,8 @@ def load_processor(cfg: DictDefault, tokenizer: PreTrainedTokenizerBase):
     processor_kwargs = {}
     if cfg.revision_of_model:
         processor_kwargs["revision"] = cfg.revision_of_model
+    if cfg.processor_kwargs:
+        processor_kwargs.update(cfg.processor_kwargs)
 
     if cfg.tokenizer_use_mistral_common:
 

src/axolotl/monkeypatch/models/gemma4/fused_attn.py

@@ -6,15 +6,29 @@ kernels, eliminating intermediate tensor allocations from rotate_half / apply_ro
 
 Usage:
     from axolotl.monkeypatch.models.gemma4.fused_attn import patch_gemma4_fused_attn
-    patch_gemma4_fused_attn()
+    # Pass install_shared_kv_workaround=True when activation checkpointing is enabled.
+    patch_gemma4_fused_attn(install_shared_kv_workaround=True)
 """
 
-import logging
 from typing import Callable
 
 import torch
 
-logger = logging.getLogger(__name__)
+from axolotl.utils.logging import get_logger
+
+logger = get_logger(__name__)
+
+# Module-level dict used as a side channel for shared KV states avoiding kwarg and TLS
+# to prevent memory leak on gradient checkpoint enabled training (PR #3611)
+_GEMMA4_SHARED_KV_STORE: dict = {"store": None}
+
+
+def _set_shared_kv_states(store):
+    _GEMMA4_SHARED_KV_STORE["store"] = store
+
+
+def _get_shared_kv_states():
+    return _GEMMA4_SHARED_KV_STORE["store"]
 
 
 def _make_fused_forward(original_forward):
@@ -30,7 +44,7 @@ def _make_fused_forward(original_forward):
         hidden_states: torch.Tensor,
         position_embeddings: torch.Tensor,
         attention_mask: torch.Tensor | None,
-        shared_kv_states: dict[int, tuple[torch.Tensor, torch.Tensor]],
+        shared_kv_states: dict[int, tuple[torch.Tensor, torch.Tensor]] | None = None,
         past_key_values=None,
         **kwargs,
     ) -> tuple[torch.Tensor, torch.Tensor | None]:
@@ -39,6 +53,10 @@ def _make_fused_forward(original_forward):
             eager_attention_forward,
         )
 
+        store = _get_shared_kv_states()
+        if store is not None:
+            shared_kv_states = store
+
         input_shape = hidden_states.shape[:-1]
         hidden_shape = (*input_shape, -1, self.head_dim)
         eps = self.config.rms_norm_eps
@@ -133,15 +151,44 @@ def _make_fused_forward(original_forward):
     return fused_forward
 
 
-def patch_gemma4_fused_attn():
+def _patch_decoder_layer_call():
+    """Strip `shared_kv_states` from decoder-layer kwargs and route via the
+    module-level side channel so the checkpoint partial cannot pin it (PR #3611).
     """
-    Monkeypatch Gemma4TextAttention.forward to use fused RMSNorm+RoPE kernels.
+    from transformers.models.gemma4.modeling_gemma4 import Gemma4TextDecoderLayer
+
+    if getattr(Gemma4TextDecoderLayer, "_axolotl_shared_kv_patched", False):
+        return
+
+    original_call = Gemma4TextDecoderLayer.__call__
+
+    def patched_call(self, *args, **kwargs):
+        shared_kv = kwargs.pop("shared_kv_states", None)
+        # Overwrite unconditionally (including with None) so a previous step's
+        # dict cannot leak into a later call without shared_kv_states (PR #3611).
+        _set_shared_kv_states(shared_kv)
+        return original_call(self, *args, **kwargs)
+
+    Gemma4TextDecoderLayer.__call__ = patched_call
+    Gemma4TextDecoderLayer._axolotl_shared_kv_patched = True
+
+
+def patch_gemma4_fused_attn(install_shared_kv_workaround: bool = False):
+    """
+    Monkeypatch Gemma4TextAttention.forward to use fused RMSNorm+RoPE kernels,
+    and optionally route `shared_kv_states` via a module-level side channel to
+    avoid a VRAM leak under activation checkpointing (PR #3611).
     """
     from transformers.models.gemma4.modeling_gemma4 import Gemma4TextAttention
 
     original_forward = Gemma4TextAttention.forward
     Gemma4TextAttention.forward = _make_fused_forward(original_forward)
 
+    if install_shared_kv_workaround:
+        _patch_decoder_layer_call()
+
     logger.info(
         "Patched Gemma4TextAttention.forward with fused RMSNorm+RoPE Triton kernels"
     )
+    if install_shared_kv_workaround:
+        logger.info("Installed Gemma4 shared_kv_states side channel (PR #3611)")

src/axolotl/monkeypatch/trainer/utils.py

@@ -407,7 +407,10 @@ def selective_log_softmax(logits, index) -> torch.Tensor:
     K = index.shape[-1]
     original_index_shape = index.shape
 
-    flat_logits = logits.reshape(-1, V).contiguous()
+    try:
+        flat_logits = logits.view(-1, V)
+    except RuntimeError:
+        flat_logits = logits.reshape(-1, V).contiguous()
     flat_index = index.reshape(-1, K).contiguous()
 
     BLOCK_V = 4096

src/axolotl/monkeypatch/unsloth_.py

@@ -1,252 +0,0 @@
-"""module for patching with unsloth optimizations"""
-
-import inspect
-import types
-
-import torch
-from peft import PeftModelForCausalLM
-from torch import nn
-from transformers.models.llama.modeling_llama import LlamaFlashAttention2
-
-from axolotl.monkeypatch.utils import detab_code
-from axolotl.utils.logging import get_logger
-
-LOG = get_logger(__name__)
-
-ORIGINAL_QKV_CODE = """
-    query_states = self.q_proj(hidden_states)
-    key_states = self.k_proj(hidden_states)
-    value_states = self.v_proj(hidden_states)
-""".lstrip("\n")
-
-PATCHED_QKV_CODE = """
-    query_states, key_states, value_states = self.apply_qkv(self, hidden_states)
-""".lstrip("\n")
-
-ORIGINAL_O_CODE = """
-    attn_output = self.o_proj(attn_output)
-""".lstrip("\n")
-
-PATCHED_O_CODE = """
-    attn_output = self.apply_o(self, attn_output)
-""".lstrip("\n")
-
-
-def original_apply_qkv(self, hidden_states):
-    query_states = self.q_proj(hidden_states)
-    key_states = self.k_proj(hidden_states)
-    value_states = self.v_proj(hidden_states)
-    return query_states, key_states, value_states
-
-
-def original_apply_o(self, hidden_states):
-    attn_output = self.o_proj(hidden_states)
-    return attn_output
-
-
-def get_self_attn_code() -> str:
-    forward = inspect.getsource(LlamaFlashAttention2.forward)
-    return forward
-
-
-def check_self_attn_is_patchable() -> bool:
-    qkv = get_self_attn_code()
-    qkv, _ = detab_code(qkv)
-    return ORIGINAL_QKV_CODE in qkv and ORIGINAL_O_CODE in qkv
-
-
-def integrate_cross_entropy_loss_patch(model_type: str = "llama") -> None:
-    from unsloth.kernels.cross_entropy_loss import fast_cross_entropy_loss
-
-    def UnslothForCausalLMLoss(
-        logits,
-        labels,
-        vocab_size: int,
-        num_items_in_batch: int = None,
-        ignore_index: int = -100,
-        **kwargs,
-    ):
-        # Upcast to float if we need to compute the loss to avoid potential precision issues
-        logits = logits.float()
-        # Shift so that tokens < n predict n
-        shift_logits = logits[..., :-1, :].contiguous()
-        shift_labels = labels[..., 1:].contiguous()
-
-        loss = fast_cross_entropy_loss(
-            logits=shift_logits, labels=shift_labels, n_items=num_items_in_batch
-        )
-        return loss
-
-    if model_type == "llama":
-        from transformers.loss import loss_utils
-
-        loss_utils.ForCausalLMLoss = UnslothForCausalLMLoss  # type: ignore[assignment]
-    else:
-        raise ValueError("Unsupported model type")
-
-
-self_attn_lora_patched = False
-
-
-def patch_self_attn_lora():
-    global self_attn_lora_patched
-    if self_attn_lora_patched:
-        # prevent patching multiple times
-        return
-    self_attn_forward = get_self_attn_code()
-    LlamaFlashAttention2._original_forward = self_attn_forward
-    self_attn_forward, _ = detab_code(self_attn_forward)
-    assert ORIGINAL_QKV_CODE in self_attn_forward, "Original qkv code not found"
-    assert ORIGINAL_O_CODE in self_attn_forward, "Original o code not found"
-
-    self_attn_forward = self_attn_forward.replace(ORIGINAL_QKV_CODE, PATCHED_QKV_CODE)
-    self_attn_forward = self_attn_forward.replace(ORIGINAL_O_CODE, PATCHED_O_CODE)
-    self_attn_forward = self_attn_forward.replace(
-        "def forward(",
-        "def unsloth_attn_forward(",
-        1,
-    )
-
-    # load imports necessary
-    import transformers.models.llama.modeling_llama
-
-    items_to_import = []
-    for item in dir(transformers.models.llama.modeling_llama):
-        if item in self_attn_forward:
-            items_to_import.append(item)
-
-    exec(
-        "from transformers.models.llama.modeling_llama import ("
-        + ", ".join(x for x in items_to_import)
-        + ")",
-        globals(),
-    )
-    exec(self_attn_forward, globals())
-    self_attn_lora_patched = True
-    LOG.info("patching unsloth attn lora")
-    LlamaFlashAttention2.forward = unsloth_attn_forward
-
-
-def integrate_rope_embeddings():
-    import transformers.models.llama.modeling_llama
-    from unsloth.kernels.rope_embedding import fast_rope_embedding
-
-    def apply_rotary_pos_emb(
-        q,
-        k,
-        cos,
-        sin,
-        position_ids=None,
-        unsqueeze_dim=1,
-    ):
-        return fast_rope_embedding(q, k, cos, sin)
-
-    LOG.info("patching unsloth RoPE embeddings")
-    transformers.models.llama.modeling_llama.apply_rotary_pos_emb = apply_rotary_pos_emb
-
-
-def integrate_lora_mlp_patch(peft_model: PeftModelForCausalLM):
-    if peft_model.base_model.config.model_type in ["llama", "mistral"]:
-        from unsloth.kernels import apply_lora_mlp_swiglu
-
-        apply_lora_mlp = apply_lora_mlp_swiglu
-    elif peft_model.base_model.config.model_type == "gemma":
-        from unsloth.kernels import apply_lora_mlp_geglu_approx
-
-        apply_lora_mlp = apply_lora_mlp_geglu_approx
-    else:
-        raise NotImplementedError(
-            f"Model type {peft_model.base_model.config.model_type} not supported"
-        )
-
-    for idx, layer in enumerate(peft_model.model.model.layers):
-        layer_modules = [
-            getattr(layer.mlp, linear_proj)
-            for linear_proj in ["gate_proj", "up_proj", "down_proj"]
-        ]
-        is_mlp_lora = all(hasattr(module, "lora_A") for module in layer_modules)
-        mlp_no_bias = all(
-            getattr(module, "base_layer", module).bias is None
-            for module in layer_modules
-        )
-        mlp_not_dora = all(
-            len(getattr(module, "lora_magnitude_vector", []) or []) == 0
-            for module in layer_modules
-        )
-
-        if is_mlp_lora and mlp_no_bias and mlp_not_dora:
-            layer.mlp.forward = types.MethodType(apply_lora_mlp, layer.mlp)
-        else:
-            LOG.warning(f"unable to apply unsloth lora mlp patch to layer {idx}")
-
-
-def integrate_lora_patch(peft_model: PeftModelForCausalLM, cfg):
-    from unsloth.kernels import apply_lora_o, apply_lora_qkv
-
-    for idx, layer in enumerate(peft_model.model.model.layers):
-        if cfg.unsloth_lora_qkv:
-            layer_modules = [
-                getattr(layer.self_attn, linear_proj)
-                for linear_proj in ["q_proj", "k_proj", "v_proj"]
-            ]
-            is_qkv_lora = all(hasattr(module, "lora_A") for module in layer_modules)
-            qkv_no_bias = all(
-                getattr(module, "base_layer", module).bias is None
-                for module in layer_modules
-            )
-            qkv_not_dora = all(
-                len(getattr(module, "lora_magnitude_vector", []) or []) == 0
-                for module in layer_modules
-            )
-
-            if is_qkv_lora and qkv_no_bias and qkv_not_dora:
-                layer.self_attn.apply_qkv = apply_lora_qkv
-            else:
-                layer.self_attn.apply_qkv = original_apply_qkv
-                LOG.warning(f"unable to apply unsloth lora qkv patch to layer {idx}")
-        if cfg.unsloth_lora_o:
-            layer_modules = [
-                getattr(layer.self_attn, linear_proj) for linear_proj in ["o_proj"]
-            ]
-            is_o_lora = all(hasattr(module, "lora_A") for module in layer_modules)
-            o_no_bias = all(
-                getattr(module, "base_layer", module).bias is None
-                for module in layer_modules
-            )
-            o_not_dora = all(
-                len(getattr(module, "lora_magnitude_vector", []) or []) == 0
-                for module in layer_modules
-            )
-
-            if is_o_lora and o_no_bias and o_not_dora:
-                layer.self_attn.apply_o = apply_lora_o
-            else:
-                layer.self_attn.apply_o = original_apply_o
-                LOG.warning(f"unable to apply unsloth lora o_proj patch to layer {idx}")
-
-
-def patch_unsloth_layernorm():
-    try:
-        import transformers.models.llama.modeling_llama
-        from unsloth.kernels.rms_layernorm import Fast_RMS_Layernorm
-
-        class LlamaRMSNorm(nn.Module):
-            """LlamaRMSNorm"""
-
-            def __init__(self, hidden_size, eps=1e-6):
-                """
-                LlamaRMSNorm is equivalent to T5LayerNorm
-                """
-                super().__init__()
-                self.weight = nn.Parameter(torch.ones(hidden_size))
-                self.variance_epsilon = eps
-
-            def forward(self, hidden_states):
-                return Fast_RMS_Layernorm.apply(
-                    hidden_states, self.weight, self.variance_epsilon, False
-                )
-
-        LOG.info("patching with unsloth.kernels.rms_layernorm")
-        transformers.models.llama.modeling_llama.LlamaRMSNorm = LlamaRMSNorm
-    except ImportError:
-        LOG.warning("missing unsloth library")

src/axolotl/prompt_strategies/chat_template.py

@@ -394,8 +394,8 @@ class ChatTemplateStrategy(PromptTokenizingStrategy):
 
     def is_prompt_batched(self, prompt: dict[str, Any]) -> bool:
         try:
-            return all(isinstance(v, list) for v in prompt.values()) and all(
+            return all(isinstance(v, (str, list)) for v in prompt.values()) and all(
-                isinstance(v, list) for v in prompt[self.prompter.field_messages]
+                isinstance(v, (str, list)) for v in prompt[self.prompter.field_messages]
             )
         except KeyError:
             return False
@@ -1004,6 +1004,13 @@ class ChatTemplateStrategy(PromptTokenizingStrategy):
         if tools is None:
             return None
 
+        # Some datasets have tools set to str
+        if isinstance(tools, str):
+            try:
+                tools = json.loads(tools)
+            except json.JSONDecodeError as e:
+                LOG.error(f"Error parsing tool parameters as JSON. Error: {e}")
+                raise
         if isinstance(tools, list):
             # Process each tool to handle JSON string parameters
             for tool in tools:
@@ -1034,6 +1041,22 @@ class ChatTemplateStrategy(PromptTokenizingStrategy):
         if messages is None:
             raise ValueError("Messages is null. Please check `field_messages`.")
 
+        if isinstance(messages, str):
+            try:
+                messages = json.loads(messages)
+            except json.JSONDecodeError as e:
+                LOG.error(f"Error parsing messages as JSON. Error: {e}")
+                raise
+            assert isinstance(messages, list), (
+                f"For SFT datasets that are stored in `str` format, the turns must be saved in a list of dictionaries, got {type(message)}"
+            )
+
+            # Extra check here to make sure decoded json is a list of dicts.
+            for i, message in enumerate(messages):
+                assert isinstance(message, dict), (
+                    f"For SFT datasets that are stored in `str` format, each turns must be saved in a dictionary, got {type(message)} for the turn {i}"
+                )
+
         if isinstance(messages, list):
             return messages
 

src/axolotl/utils/collators/__init__.py

@@ -6,6 +6,7 @@ from .batching import (
     PretrainingBatchSamplerDataCollatorForSeq2Seq,
     V2BatchSamplerDataCollatorForSeq2Seq,
 )
+from .dpo import AxolotlDPODataCollatorWithPadding
 from .mamba import MambaDataCollator
 
 __all__ = [
@@ -13,5 +14,6 @@ __all__ = [
     "BatchSamplerDataCollatorForSeq2Seq",
     "V2BatchSamplerDataCollatorForSeq2Seq",
     "PretrainingBatchSamplerDataCollatorForSeq2Seq",
+    "AxolotlDPODataCollatorWithPadding",
     "MambaDataCollator",
 ]

src/axolotl/utils/collators/dpo.py

@@ -0,0 +1,128 @@
+"""DPO/ORPO/IPO/KTO data collator with pad_to_multiple_of support.
+
+Extends TRL's DPODataCollatorWithPadding to round padded sequence lengths
+up to a fixed multiple. This stabilizes Triton autotune caches for kernels
+that key on sequence length (e.g. fla's linear attention kernels used by
+Qwen3.5), which otherwise re-autotune on every distinct batch length.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Any
+
+import torch
+from torch.nn.utils.rnn import pad_sequence
+from trl.experimental.utils import DPODataCollatorWithPadding
+from trl.trainer.utils import pad
+
+
+def _round_up(length: int, multiple: int) -> int:
+    return ((length + multiple - 1) // multiple) * multiple
+
+
+@dataclass
+class AxolotlDPODataCollatorWithPadding(DPODataCollatorWithPadding):
+    """DPO data collator that pads to a multiple of ``pad_to_multiple_of``.
+
+    Args:
+        pad_token_id: Tokenizer pad token id (inherited).
+        is_encoder_decoder: Whether the model is encoder-decoder (inherited).
+        pad_to_multiple_of: If set, padded lengths are rounded up to this
+            multiple. Helps stabilize Triton autotune caches.
+    """
+
+    pad_to_multiple_of: int | None = None
+
+    def __call__(self, features: list[dict[str, Any]]) -> dict[str, Any]:
+        pad_to_mult = self.pad_to_multiple_of
+
+        padded_batch: dict[str, Any] = {}
+        for k in features[0].keys():
+            if k.endswith(
+                ("_input_ids", "_attention_mask", "_labels", "_pixel_values")
+            ):
+                if self.is_encoder_decoder:
+                    if k.endswith("_pixel_values"):
+                        to_pad = [
+                            torch.tensor(ex[k], dtype=torch.float32) for ex in features
+                        ]
+                    else:
+                        to_pad = [torch.LongTensor(ex[k]) for ex in features]
+
+                    if k.startswith("prompt") and k.endswith("input_ids"):
+                        if self.pad_token_id is None:
+                            raise ValueError(
+                                "Padding is enabled, but the tokenizer is not configured with a padding token."
+                            )
+                        padding_value = self.pad_token_id
+                    elif k.endswith("_attention_mask"):
+                        padding_value = 0
+                    elif k.endswith("_pixel_values"):
+                        padding_value = 0
+                    elif (
+                        k.startswith(("chosen", "rejected", "completion"))
+                        or "decoder" in k
+                    ):
+                        padding_value = -100
+                    else:
+                        raise ValueError(f"Unexpected key in batch '{k}'")
+
+                    padded = pad_sequence(
+                        to_pad, batch_first=True, padding_value=padding_value
+                    )
+                    if pad_to_mult:
+                        cur = padded.shape[1]
+                        target = _round_up(cur, pad_to_mult)
+                        if target > cur:
+                            extra = target - cur
+                            pad_shape = list(padded.shape)
+                            pad_shape[1] = extra
+                            filler = torch.full(
+                                pad_shape,
+                                padding_value,
+                                dtype=padded.dtype,
+                                device=padded.device,
+                            )
+                            padded = torch.cat([padded, filler], dim=1)
+                    padded_batch[k] = padded
+                else:
+                    if k.endswith("_input_ids"):
+                        if self.pad_token_id is None:
+                            raise ValueError(
+                                "Padding is enabled, but the tokenizer is not configured with a padding token."
+                            )
+                        padding_value = self.pad_token_id
+                    elif k.endswith("_labels"):
+                        padding_value = -100
+                    elif k.endswith("_attention_mask"):
+                        padding_value = 0
+                    elif k.endswith("_pixel_values"):
+                        padding_value = 0
+                    else:
+                        raise ValueError(f"Unexpected key in batch '{k}'")
+
+                    padding_side = (
+                        "left"
+                        if k in ("prompt_input_ids", "prompt_attention_mask")
+                        else "right"
+                    )
+
+                    dtype = (
+                        torch.float32 if k.endswith("_pixel_values") else torch.int64
+                    )
+                    to_pad = [torch.tensor(ex[k], dtype=dtype) for ex in features]
+
+                    # trl.pad() natively supports pad_to_multiple_of
+                    padded_batch[k] = pad(
+                        to_pad,
+                        padding_value=padding_value,
+                        padding_side=padding_side,
+                        pad_to_multiple_of=pad_to_mult,
+                    )
+            elif k.endswith("_logps"):
+                padded_batch[k] = torch.tensor([ex[k] for ex in features])
+            else:
+                padded_batch[k] = [ex[k] for ex in features]
+
+        return padded_batch

src/axolotl/utils/schemas/config.py

@@ -309,6 +309,16 @@ class AxolotlInputConfig(
 
     dpo_padding_free: bool | None = None
 
+    dpo_loss_type: Annotated[list[str], MinLen(1)] | None = Field(
+        default=None,
+        json_schema_extra={"description": "List of DPO losses to use."},
+    )
+
+    dpo_loss_weights: Annotated[list[float], MinLen(1)] | None = Field(
+        default=None,
+        json_schema_extra={"description": "Weights for each DPO loss."},
+    )
+
     datasets: (
         Annotated[
             list[
@@ -663,6 +673,12 @@ class AxolotlInputConfig(
             "description": "Pad inputs so each step uses constant sized buffers. This will reduce memory fragmentation and may prevent OOMs, by re-using memory more efficiently. Defaults to True if `sample_packing` enabled"
         },
     )
+    pad_to_multiple_of: int | None = Field(
+        default=None,
+        json_schema_extra={
+            "description": ("Pad each batch to a multiple of this value.")
+        },
+    )
     curriculum_sampling: bool | None = Field(
         default=None,
         json_schema_extra={
@@ -823,13 +839,6 @@ class AxolotlInputConfig(
         },
     )
 
-    unsloth_cross_entropy_loss: bool | None = None
-    unsloth_lora_mlp: bool | None = None
-    unsloth_lora_qkv: bool | None = None
-    unsloth_lora_o: bool | None = None
-    unsloth_rms_norm: bool | None = None
-    unsloth_rope: bool | None = None
-
     lora_mlp_kernel: bool | None = Field(
         default=None,
         json_schema_extra={
@@ -1007,7 +1016,7 @@ class AxolotlInputConfig(
     torch_compile: Literal["auto"] | bool | None = Field(
         default=None,
         json_schema_extra={
-            "description": "Whether to use torch.compile and which backend to use. setting to `auto` will enable torch compile when torch>=2.6.0"
+            "description": "Whether to use torch.compile and which backend to use."
         },
     )
     torch_compile_backend: str | None = Field(
@@ -1469,21 +1478,6 @@ class AxolotlConfigWCapabilities(AxolotlInputConfig):
             )
         return data
 
-    @model_validator(mode="before")
-    @classmethod
-    def check_multigpu_unsloth(cls, data):
-        if (
-            data.get("unsloth_lora_mlp")
-            or data.get("unsloth_lora_qkv")
-            or data.get("unsloth_lora_o")
-        ):
-            capabilities = data.get("capabilities")
-            if capabilities and capabilities.get("n_gpu", 0) > 1:
-                raise ValueError(
-                    "unsloth_lora_mlp, unsloth_lora_qkv, and unsloth_lora_o are not compatible with multi-GPU training."
-                )
-        return data
-
     @model_validator(mode="before")
     @classmethod
     def check_multigpu_lora_kernels(cls, data):
@@ -1537,8 +1531,7 @@ class AxolotlConfigWCapabilities(AxolotlInputConfig):
             # RL trainers not tested so don't enable kernels by default
             return data
         if data.get("adapter") in ["lora", "qlora"]:
-            # Skip if already set, using unsloth optimizations, or using 8-bit
+            # Skip if already set or using 8-bit
-            unsloth_fields = ["unsloth_lora_mlp", "unsloth_lora_qkv", "unsloth_lora_o"]
             kernel_fields = [
                 "lora_mlp_kernel",
                 "lora_qkv_kernel",
@@ -1547,7 +1540,6 @@ class AxolotlConfigWCapabilities(AxolotlInputConfig):
             ]
             if (
                 any(data.get(k) is not None for k in kernel_fields)
-                or any(data.get(k) for k in unsloth_fields)
                 or data.get("adapter") == "lora"
                 and data.get("load_in_8bit")
             ):

src/axolotl/utils/schemas/model.py

@@ -64,6 +64,12 @@ class ModelInputConfig(BaseModel):
     processor_type: str | None = Field(
         default=None, json_schema_extra={"description": "transformers processor class"}
     )
+    processor_kwargs: dict[str, Any] | None = Field(
+        default=None,
+        json_schema_extra={
+            "description": "kwargs forwarded to the processor's from_pretrained(), overriding processor config (e.g. image_seq_length, min_pixels, etc.)."
+        },
+    )
     tokenizer_save_jinja_files: bool | None = Field(
         default=True,  # match the default behavior from transformers
         json_schema_extra={
@@ -107,6 +113,22 @@ class ModelInputConfig(BaseModel):
             )
         return trust_remote_code
 
+    @field_validator("processor_kwargs")
+    @classmethod
+    def reject_reserved_processor_kwargs(cls, processor_kwargs):
+        if not processor_kwargs:
+            return processor_kwargs
+        reserved = {"revision", "trust_remote_code"}
+        conflicts = reserved.intersection(processor_kwargs)
+        if conflicts:
+            raise ValueError(
+                "Do not set reserved keys "
+                f"{sorted(conflicts)} inside `processor_kwargs`; "
+                "use the top-level `revision_of_model` / `trust_remote_code` "
+                "config keys instead."
+            )
+        return processor_kwargs
+
 
 class ModelOutputConfig(BaseModel):
     """model save configuration subset"""

src/axolotl/utils/schemas/validation.py

@@ -52,6 +52,26 @@ class DatasetValidationMixin:
 
         return datasets
 
+    @model_validator(mode="before")
+    @classmethod
+    def check_deprecated_unsloth_fields(cls, data):
+        deprecated_fields = [
+            "unsloth_cross_entropy_loss",
+            "unsloth_lora_mlp",
+            "unsloth_lora_qkv",
+            "unsloth_lora_o",
+            "unsloth_rms_norm",
+            "unsloth_rope",
+        ]
+        found = [f for f in deprecated_fields if data.get(f)]
+        if found:
+            raise ValueError(
+                f"`{'`, `'.join(found)}` {'has' if len(found) == 1 else 'have'} been removed. "
+                "Please use `lora_mlp_kernel`, `lora_qkv_kernel`, `lora_o_kernel` instead. "
+                "See: https://docs.axolotl.ai/docs/lora_optims.html"
+            )
+        return data
+
     @model_validator(mode="before")
     @classmethod
     def check_dataset_or_pretraining_dataset(cls, data):
@@ -558,6 +578,11 @@ class TrainingValidationMixin:
                 "Setting chat_template is not supported with mistral-common tokenizer"
             )
 
+        if data.get("processor_kwargs"):
+            raise ValueError(
+                "processor_kwargs is not supported with mistral-common tokenizer"
+            )
+
         return data
 
     @model_validator(mode="before")
@@ -607,36 +632,6 @@ class LoRAValidationMixin:
             )
         return data
 
-    @model_validator(mode="before")
-    @classmethod
-    def check_qlora_unsloth(cls, data):
-        if (
-            data.get("unsloth_lora_mlp")
-            or data.get("unsloth_lora_qkv")
-            or data.get("unsloth_lora_o")
-        ):
-            if data.get("adapter") == "lora" and data.get("load_in_8bit"):
-                raise ValueError(
-                    "unsloth_lora_mlp, unsloth_lora_qkv, and unsloth_lora_o are not compatible with 8-bit LoRA"
-                )
-        return data
-
-    @model_validator(mode="before")
-    @classmethod
-    def check_lora_axolotl_unsloth(cls, data):
-        is_lora_kernel = any(
-            data.get(k) for k in ["lora_mlp_kernel", "lora_qkv_kernel", "lora_o_kernel"]
-        )
-        is_unsloth_lora = any(
-            data.get(k)
-            for k in ["unsloth_lora_mlp", "unsloth_lora_qkv", "unsloth_lora_o"]
-        )
-        if is_lora_kernel and is_unsloth_lora:
-            raise ValueError(
-                "both lora_mlp_kernel and unsloth_lora_mlp cannot be true (similarly for lora_qkv_kernel, lora_o_kernel)"
-            )
-        return data
-
     @model_validator(mode="after")
     def check_fused_lora(self):
         if self.adapter in ["lora", "qlora"] and self.flash_attn_fuse_mlp:
@@ -770,6 +765,40 @@ class RLValidationMixin:
             )
         return data
 
+    @model_validator(mode="before")
+    @classmethod
+    def check_dpo(cls, data):
+        dpo_loss_type = data.get("dpo_loss_type")
+        dpo_loss_weights = data.get("dpo_loss_weights")
+        rl = data.get("rl")
+
+        if rl == "ipo":
+            LOG.warning(
+                "rl: ipo will soon be deprecated. Use `rl: dpo` with `dpo_loss_type: ['ipo']` instead."
+            )
+
+        if rl == "dpo":
+            if dpo_loss_weights is not None and dpo_loss_type is None:
+                raise ValueError(
+                    "`dpo_loss_weights` requires `dpo_loss_type` to be set"
+                )
+            if (
+                dpo_loss_type is not None
+                and dpo_loss_weights is not None
+                and len(dpo_loss_type) != len(dpo_loss_weights)
+            ):
+                raise ValueError(
+                    f"`dpo_loss_type` and `dpo_loss_weights` must be the same length, "
+                    f"but got {len(dpo_loss_type)} losses and {len(dpo_loss_weights)} weights"
+                )
+        elif dpo_loss_type is not None or dpo_loss_weights is not None:
+            raise ValueError(
+                f"`dpo_loss_type` and `dpo_loss_weights` are for DPO only,"
+                f"but got {rl=}, {dpo_loss_type=} and {dpo_loss_weights=}"
+            )
+
+        return data
+
     @model_validator(mode="before")
     @classmethod
     def check_grpo_batch_size_divisibility(cls, data):
@@ -942,17 +971,6 @@ class OptimizationValidationMixin:
 
         return data
 
-    @model_validator(mode="before")
-    @classmethod
-    def check_xentropy_patch_conflicts(cls, data):
-        if data.get("flash_attn_cross_entropy") and data.get(
-            "unsloth_cross_entropy_loss"
-        ):
-            raise ValueError(
-                "flash_attn_cross_entropy and unsloth_cross_entropy_loss cannot be both enabled"
-            )
-        return data
-
     @model_validator(mode="before")
     @classmethod
     def check_cross_entropy_conflicts(cls, data):

src/setuptools_axolotl_dynamic_dependencies.py

@@ -1,102 +0,0 @@
-"""
-dynamic requirements for axolotl
-"""
-
-import platform
-import re
-from importlib.metadata import PackageNotFoundError, version
-
-from setuptools.command.build_py import build_py as _build_py
-
-
-def parse_requirements():
-    _install_requires = []
-    _dependency_links = []
-    with open("./requirements.txt", encoding="utf-8") as requirements_file:
-        lines = [r.strip() for r in requirements_file.readlines()]
-        for line in lines:
-            is_extras = (
-                "flash-attn" in line
-                or "flash-attention" in line
-                or "deepspeed" in line
-                or "mamba-ssm" in line
-                or "lion-pytorch" in line
-            )
-            if line.startswith("--extra-index-url"):
-                # Handle custom index URLs
-                _, url = line.split()
-                _dependency_links.append(url)
-            elif not is_extras and line and line[0] != "#":
-                # Handle standard packages
-                _install_requires.append(line)
-
-    try:
-        xformers_version = [req for req in _install_requires if "xformers" in req][0]
-        torchao_version = [req for req in _install_requires if "torchao" in req][0]
-
-        if "Darwin" in platform.system():
-            # don't install xformers on MacOS
-            _install_requires.pop(_install_requires.index(xformers_version))
-        else:
-            # detect the version of torch already installed
-            # and set it so dependencies don't clobber the torch version
-            try:
-                torch_version = version("torch")
-            except PackageNotFoundError:
-                torch_version = "2.5.1"
-            _install_requires.append(f"torch=={torch_version}")
-
-            version_match = re.match(r"^(\d+)\.(\d+)(?:\.(\d+))?", torch_version)
-            if version_match:
-                major, minor, patch = version_match.groups()
-                major, minor = int(major), int(minor)
-                patch = (
-                    int(patch) if patch is not None else 0
-                )  # Default patch to 0 if not present
-            else:
-                raise ValueError("Invalid version format")
-
-            if (major, minor) >= (2, 5):
-                _install_requires.pop(_install_requires.index(xformers_version))
-                if patch == 0:
-                    _install_requires.append("xformers==0.0.28.post2")
-                else:
-                    _install_requires.append("xformers==0.0.28.post3")
-            elif (major, minor) >= (2, 4):
-                if patch == 0:
-                    _install_requires.pop(_install_requires.index(xformers_version))
-                    _install_requires.append("xformers>=0.0.27")
-                else:
-                    _install_requires.pop(_install_requires.index(xformers_version))
-                    _install_requires.append("xformers==0.0.28.post1")
-            elif (major, minor) >= (2, 3):
-                _install_requires.pop(_install_requires.index(torchao_version))
-                if patch == 0:
-                    _install_requires.pop(_install_requires.index(xformers_version))
-                    _install_requires.append("xformers>=0.0.26.post1")
-                else:
-                    _install_requires.pop(_install_requires.index(xformers_version))
-                    _install_requires.append("xformers>=0.0.27")
-            elif (major, minor) >= (2, 2):
-                _install_requires.pop(_install_requires.index(torchao_version))
-                _install_requires.pop(_install_requires.index(xformers_version))
-                _install_requires.append("xformers>=0.0.25.post1")
-            else:
-                _install_requires.pop(_install_requires.index(torchao_version))
-                _install_requires.pop(_install_requires.index(xformers_version))
-                _install_requires.append("xformers>=0.0.23.post1")
-
-    except PackageNotFoundError:
-        pass
-    return _install_requires, _dependency_links
-
-
-class BuildPyCommand(_build_py):
-    """
-    custom build_py command to parse dynamic requirements
-    """
-
-    def finalize_options(self):
-        super().finalize_options()
-        install_requires, _ = parse_requirements()
-        self.distribution.install_requires = install_requires

tests/conftest.py

@@ -325,10 +325,10 @@ def download_phi_4_reasoning_model_fixture():
 
 
 @pytest.fixture(scope="session", autouse=True)
-def download_phi_3_medium_model_fixture():
+def download_phi_3_mini_model_fixture():
     # download the tokenizer only
     snapshot_download_w_retry(
-        "microsoft/Phi-3-medium-128k-instruct",
+        "microsoft/Phi-3-mini-4k-instruct",
         repo_type="model",
         allow_patterns=["*token*", "config.json"],
     )

tests/core/test_builders.py

@@ -96,6 +96,8 @@ def fixture_dpo_cfg(base_cfg):
             "dpo_use_weighting": True,
             "dpo_label_smoothing": 0.1,
             "beta": 0.1,  # DPO beta
+            "dpo_loss_type": ["sigmoid", "sft"],
+            "dpo_loss_weights": [1.0, 0.5],
         }
     )
     return cfg
@@ -164,7 +166,8 @@ def fixture_ipo_cfg(base_cfg):
     cfg = base_cfg.copy()
     cfg.update(
         {
-            "rl": RLType.IPO,
+            "rl": RLType.DPO,
+            "dpo_loss_type": ["ipo"],
             "dpo_label_smoothing": 0,
             "beta": 0.1,
         }
@@ -300,6 +303,8 @@ class TestHFRLTrainerBuilder:
         assert training_arguments.use_weighting is True
         assert training_arguments.label_smoothing == 0.1
         assert training_arguments.precompute_ref_log_probs is True
+        assert training_arguments.loss_type == ["sigmoid", "sft"]
+        assert training_arguments.loss_weights == [1.0, 0.5]
 
     def test_orpo_training_arguments(self, orpo_cfg, model, tokenizer):
         builder = HFRLTrainerBuilder(orpo_cfg, model, tokenizer)

tests/e2e/integrations/test_scattermoe_lora_olmoe.py

@@ -54,7 +54,9 @@ except (ImportError, ModuleNotFoundError):
         )
 
     def peft_lora_to_scattermoe(peft_A, peft_B, num_experts, rank):
-        return peft_A, peft_lora_B_to_scattermoe(peft_B, num_experts, rank)
+        smoe_A = peft_A
+        smoe_B = peft_lora_B_to_scattermoe(peft_B, num_experts, rank)
+        return smoe_A, smoe_B
 
     def _unwrap_experts_lora(experts_module):
         return experts_module, None, None
@@ -127,7 +129,11 @@ def scattermoe_lora_B_to_peft(smoe_B, num_experts, rank):
 
 
 def peft_gate_up_lora_to_scattermoe(peft_A, peft_B, num_experts, rank):
-    """Convert peft LoRA for gate_up_proj to scattermoe layout."""
+    """Convert peft LoRA for gate_up_proj to scattermoe layout.
+
+    Both gate_up_proj and down_proj need the A<->B swap because
+    scattermoe transposes the parameter (W = param.T).
+    """
     return peft_lora_to_scattermoe(peft_A, peft_B, num_experts, rank)
 
 
@@ -300,6 +306,8 @@ class TestLoRABLayoutConversion:
         hidden, inter = 32, 16
         scaling = 2.0
 
+        # peft >=0.19.1 for down_proj [E, hidden, inter]:
+        # swaps in/out, lora_A [r*E, inter], lora_B [hidden, r*E]
         peft_A = torch.randn(E * r, inter)
         peft_B = torch.randn(hidden, E * r)
 
@@ -308,8 +316,6 @@ class TestLoRABLayoutConversion:
         delta_peft = torch.einsum("o r e, e r i -> e o i", B_r, A_r) * scaling
 
         smoe_A, smoe_B = peft_lora_to_scattermoe(peft_A, peft_B, E, r)
-        assert smoe_A.shape == (E * r, inter)
-        assert smoe_B.shape == (hidden, E * r)
         for e in range(E):
             A_e = smoe_A[e * r : (e + 1) * r, :]
             B_e = smoe_B[:, e * r : (e + 1) * r]
@@ -319,30 +325,22 @@ class TestLoRABLayoutConversion:
             )
 
     def test_gate_up_proj_conversion(self):
-        """Verify gate_up_proj LoRA conversion with non-square dims (Qwen3-like).
+        """Verify gate_up_proj LoRA conversion with non-square dims.
 
         gate_up_proj param: [E, 2*inter, hidden].
-        peft: in_features=hidden, out_features=2*inter.
+        peft swaps in/out for 3D: lora_A [r*E, hidden], lora_B [2*inter, r*E].
-        peft lora_A: [r*E, hidden], lora_B: [2*inter, r*E].
-
-        scattermoe W = param.T = [E, hidden, 2*inter], K=hidden, N=2*inter.
         scattermoe needs: lora_A [r*E, K=hidden], lora_B [N=2*inter, r*E].
-
-        Uses non-square dims (hidden=32 != 2*inter=24) to catch layout bugs.
         """
         E, r = 4, 2
         hidden, inter = 32, 12  # 2*inter=24 != hidden=32
         scaling = 2.0
 
-        # peft assigns: in_features=hidden, out_features=2*inter
+        peft_A = torch.randn(E * r, hidden)  # [r*E, in=hidden]
-        peft_A = torch.randn(E * r, hidden)  # [r*E, in_features=hidden]
+        peft_B = torch.randn(2 * inter, E * r)  # [out=2*inter, r*E]
-        peft_B = torch.randn(2 * inter, E * r)  # [out_features=2*inter, r*E]
 
         A_r = peft_A.reshape(E, r, hidden)
         B_r = peft_B.reshape(2 * inter, r, E)
         delta_peft = torch.einsum("o r e, e r i -> e o i", B_r, A_r) * scaling
-        # delta_peft[e] has shape [out_features, in_features] = [2*inter, hidden]
-        # = param[e] shape [2*inter, hidden]
 
         smoe_A, smoe_B = peft_gate_up_lora_to_scattermoe(peft_A, peft_B, E, r)
         # smoe_A should be [r*E, K=hidden], smoe_B should be [N=2*inter, r*E]
@@ -400,8 +398,7 @@ class TestPeftLoRAWeightExtraction:
             r,
         )
 
-        # gate_up_proj [E, 2*inter, hidden]
+        # gate_up_proj [E, 2*inter, hidden] — peft swaps in/out for 3D
-        # peft: in_features=hidden (last dim), out_features=2*inter (middle dim)
         assert trainable[
             "base_model.model.moe.experts.base_layer.lora_A.default.weight"
         ].shape == (E * r, config.hidden_size)
@@ -409,8 +406,7 @@ class TestPeftLoRAWeightExtraction:
             "base_model.model.moe.experts.base_layer.lora_B.default.weight"
         ].shape == (2 * config.intermediate_size, E * r)
 
-        # down_proj [E, hidden, inter]
+        # down_proj [E, hidden, inter] — peft swaps in/out for 3D
-        # peft: in_features=inter (last dim), out_features=hidden (middle dim)
         assert trainable[
             "base_model.model.moe.experts.lora_A.default.weight"
         ].shape == (E * r, config.intermediate_size)
@@ -467,29 +463,26 @@ class TestPeftLoRAWeightExtraction:
         assert gup_lora is not None, "gate_up_proj LoRA not detected"
         assert down_lora is not None, "down_proj LoRA not detected"
 
-        # Check shapes after peft->scattermoe conversion.
+        # gate_up_proj: K=hidden, N=2*inter
-        # gate_up_proj: peft A [E*r, hidden] / B [2*inter, E*r]
-        # scattermoe: smoe_A [E*r, hidden], smoe_B [2*inter, E*r]
         E, r = config.num_experts, 4
         gup_A, gup_B, gup_s = gup_lora
         assert gup_A.shape == (E * r, config.hidden_size), (
-            f"gate_up_proj smoe_A: expected [r*E, hidden]={(E * r, config.hidden_size)}, "
+            f"gate_up_proj smoe_A: expected [r*E, K=hidden]={(E * r, config.hidden_size)}, "
             f"got {gup_A.shape}"
         )
         assert gup_B.shape == (2 * config.intermediate_size, E * r), (
-            f"gate_up_proj smoe_B: expected [2*inter, r*E]="
+            f"gate_up_proj smoe_B: expected [N=2*inter, r*E]="
             f"{(2 * config.intermediate_size, E * r)}, got {gup_B.shape}"
         )
 
-        # down_proj: peft A [E*r, inter] / B [hidden, E*r]
+        # down_proj: K=inter, N=hidden
-        # scattermoe: smoe_A [E*r, inter], smoe_B [hidden, E*r]
         down_A, down_B, down_s = down_lora
         assert down_A.shape == (E * r, config.intermediate_size), (
-            f"down_proj smoe_A: expected [r*E, inter]={(E * r, config.intermediate_size)}, "
+            f"down_proj smoe_A: expected [r*E, K=inter]={(E * r, config.intermediate_size)}, "
             f"got {down_A.shape}"
         )
         assert down_B.shape == (config.hidden_size, E * r), (
-            f"down_proj smoe_B: expected [hidden, r*E]={(config.hidden_size, E * r)}, "
+            f"down_proj smoe_B: expected [N=hidden, r*E]={(config.hidden_size, E * r)}, "
             f"got {down_B.shape}"
         )
 

tests/e2e/patched/test_unsloth_integration.py

@@ -1,21 +0,0 @@
-"""Test module for checking whether the integration of Unsloth with Hugging Face Transformers is working as expected."""
-
-import unittest
-
-import pytest
-
-
-@pytest.mark.skip(
-    reason="Unsloth integration will be broken going into latest transformers"
-)
-class TestUnslothIntegration(unittest.TestCase):
-    """Unsloth monkeypatch integration tests."""
-
-    def test_is_self_attn_patchable(self):
-        from axolotl.monkeypatch.unsloth_ import check_self_attn_is_patchable
-
-        # ensures the current version of transformers has loss code that matches our patching code
-        self.assertTrue(
-            check_self_attn_is_patchable(),
-            "HF transformers self attention code has changed and isn't patchable",
-        )

tests/e2e/patched/test_unsloth_qlora.py

@@ -1,184 +0,0 @@
-"""
-e2e tests for unsloth qlora
-"""
-
-import pytest
-
-from axolotl.common.datasets import load_datasets
-from axolotl.train import train
-from axolotl.utils.config import normalize_config, validate_config
-from axolotl.utils.dict import DictDefault
-
-from ..utils import check_model_output_exists, check_tensorboard
-
-
-@pytest.mark.skip(
-    reason="Unsloth integration will be broken going into latest transformers"
-)
-class TestUnslothQLoRA:
-    """
-    Test class for Unsloth QLoRA Llama models
-    """
-
-    @pytest.mark.parametrize(
-        "sample_packing",
-        [True, False],
-    )
-    def test_unsloth_llama_qlora_fa2(self, temp_dir, sample_packing):
-        cfg = DictDefault(
-            {
-                "base_model": "HuggingFaceTB/SmolLM2-135M",
-                "sequence_len": 1024,
-                "sample_packing": sample_packing,
-                "flash_attention": True,
-                "unsloth_lora_mlp": True,
-                "unsloth_lora_qkv": True,
-                "unsloth_lora_o": True,
-                "load_in_4bit": True,
-                "adapter": "qlora",
-                "lora_r": 16,
-                "lora_alpha": 16,
-                "lora_dropout": 0.05,
-                "lora_target_linear": True,
-                "val_set_size": 0.05,
-                "special_tokens": {
-                    "pad_token": "<|endoftext|>",
-                },
-                "datasets": [
-                    {
-                        "path": "mhenrichsen/alpaca_2k_test",
-                        "type": "alpaca",
-                    },
-                ],
-                "num_epochs": 1,
-                "max_steps": 5,
-                "save_steps": 10,
-                "micro_batch_size": 4,
-                "gradient_accumulation_steps": 2,
-                "output_dir": temp_dir,
-                "learning_rate": 0.00001,
-                "optimizer": "adamw_8bit",
-                "lr_scheduler": "cosine",
-                "use_tensorboard": True,
-                "bf16": "auto",
-                "save_first_step": False,
-            }
-        )
-
-        cfg = validate_config(cfg)
-        normalize_config(cfg)
-        dataset_meta = load_datasets(cfg=cfg)
-
-        train(cfg=cfg, dataset_meta=dataset_meta)
-        check_model_output_exists(temp_dir, cfg)
-
-        check_tensorboard(
-            temp_dir + "/runs", "train/train_loss", 2.0, "Train Loss (%s) is too high"
-        )
-
-    def test_unsloth_llama_qlora_unpacked(self, temp_dir):
-        cfg = DictDefault(
-            {
-                "base_model": "HuggingFaceTB/SmolLM2-135M",
-                "sequence_len": 1024,
-                "unsloth_lora_mlp": True,
-                "unsloth_lora_qkv": True,
-                "unsloth_lora_o": True,
-                "sample_packing": False,
-                "load_in_4bit": True,
-                "adapter": "qlora",
-                "lora_r": 16,
-                "lora_alpha": 16,
-                "lora_dropout": 0.05,
-                "lora_target_linear": True,
-                "val_set_size": 0.05,
-                "special_tokens": {
-                    "pad_token": "<|endoftext|>",
-                },
-                "datasets": [
-                    {
-                        "path": "mhenrichsen/alpaca_2k_test",
-                        "type": "alpaca",
-                    },
-                ],
-                "num_epochs": 1,
-                "max_steps": 5,
-                "save_steps": 10,
-                "micro_batch_size": 4,
-                "gradient_accumulation_steps": 2,
-                "output_dir": temp_dir,
-                "learning_rate": 0.00001,
-                "optimizer": "adamw_8bit",
-                "lr_scheduler": "cosine",
-                "use_tensorboard": True,
-                "bf16": "auto",
-                "save_first_step": False,
-            }
-        )
-
-        cfg = validate_config(cfg)
-        normalize_config(cfg)
-        dataset_meta = load_datasets(cfg=cfg)
-
-        train(cfg=cfg, dataset_meta=dataset_meta)
-        check_model_output_exists(temp_dir, cfg)
-
-        check_tensorboard(
-            temp_dir + "/runs", "train/train_loss", 2.0, "Train Loss (%s) is too high"
-        )
-
-    @pytest.mark.parametrize(
-        "sdp_attention",
-        [True, False],
-    )
-    def test_unsloth_llama_qlora_unpacked_no_fa2_fp16(self, temp_dir, sdp_attention):
-        cfg = DictDefault(
-            {
-                "base_model": "HuggingFaceTB/SmolLM2-135M",
-                "sequence_len": 1024,
-                "unsloth_lora_mlp": True,
-                "unsloth_lora_qkv": True,
-                "unsloth_lora_o": True,
-                "sample_packing": False,
-                "load_in_4bit": True,
-                "adapter": "qlora",
-                "lora_r": 16,
-                "lora_alpha": 16,
-                "lora_dropout": 0.05,
-                "lora_target_linear": True,
-                "val_set_size": 0.05,
-                "special_tokens": {
-                    "pad_token": "<|endoftext|>",
-                },
-                "datasets": [
-                    {
-                        "path": "mhenrichsen/alpaca_2k_test",
-                        "type": "alpaca",
-                    },
-                ],
-                "num_epochs": 1,
-                "max_steps": 5,
-                "save_steps": 10,
-                "micro_batch_size": 4,
-                "gradient_accumulation_steps": 2,
-                "sdp_attention": sdp_attention,
-                "output_dir": temp_dir,
-                "learning_rate": 0.00001,
-                "optimizer": "adamw_8bit",
-                "lr_scheduler": "cosine",
-                "use_tensorboard": True,
-                "fp16": True,
-                "save_first_step": False,
-            }
-        )
-
-        cfg = validate_config(cfg)
-        normalize_config(cfg)
-        dataset_meta = load_datasets(cfg=cfg)
-
-        train(cfg=cfg, dataset_meta=dataset_meta)
-        check_model_output_exists(temp_dir, cfg)
-
-        check_tensorboard(
-            temp_dir + "/runs", "train/train_loss", 2.0, "Train Loss (%s) is too high"
-        )

tests/e2e/test_dpo.py

@@ -116,6 +116,58 @@ class TestDPOLlamaLora(unittest.TestCase):
         train(cfg=cfg, dataset_meta=dataset_meta)
         check_model_output_exists(Path(temp_dir) / "checkpoint-20", cfg)
 
+    @with_temp_dir
+    def test_rpo(self, temp_dir):
+        # For TRL >= 0.29, loss_type=["sigmoid", "sft"], loss_weights=[1, alpha]
+        # replaces loss_type="rpo", rpo_alpha=alpha.
+        cfg = DictDefault(
+            {
+                "base_model": "HuggingFaceTB/SmolLM2-135M",
+                "tokenizer_type": "AutoTokenizer",
+                "sequence_len": 1024,
+                "load_in_8bit": True,
+                "adapter": "lora",
+                "lora_r": 64,
+                "lora_alpha": 32,
+                "lora_dropout": 0.1,
+                "lora_target_linear": True,
+                "special_tokens": {
+                    "pad_token": "<|endoftext|>",
+                },
+                "rl": "dpo",
+                "dpo_loss_type": ["sigmoid", "sft"],
+                "dpo_loss_weights": [1.0, 1.0],
+                "datasets": [
+                    {
+                        "path": "arcee-ai/distilabel-intel-orca-dpo-pairs-binarized",
+                        "type": "chatml.ultra",
+                        "split": "train",
+                    },
+                ],
+                "num_epochs": 1,
+                "micro_batch_size": 4,
+                "gradient_accumulation_steps": 1,
+                "output_dir": temp_dir,
+                "learning_rate": 0.00001,
+                "optimizer": "paged_adamw_8bit",
+                "lr_scheduler": "cosine",
+                "max_steps": 20,
+                "save_steps": 10,
+                "warmup_steps": 5,
+                "gradient_checkpointing": True,
+                "gradient_checkpointing_kwargs": {"use_reentrant": True},
+                "save_first_step": False,
+            }
+        )
+
+        cfg = validate_config(cfg)
+        normalize_config(cfg)
+        cli_args = TrainerCliArgs()
+        dataset_meta = load_preference_datasets(cfg=cfg, cli_args=cli_args)
+
+        train(cfg=cfg, dataset_meta=dataset_meta)
+        check_model_output_exists(Path(temp_dir) / "checkpoint-20", cfg)
+
     @pytest.mark.skip("kto_pair no longer supported in trl")
     @with_temp_dir
     def test_kto_pair_lora(self, temp_dir):
@@ -181,7 +233,8 @@ class TestDPOLlamaLora(unittest.TestCase):
                 "special_tokens": {
                     "pad_token": "<|endoftext|>",
                 },
-                "rl": "ipo",
+                "rl": "dpo",
+                "dpo_loss_type": ["ipo"],
                 "datasets": [
                     {
                         "path": "arcee-ai/distilabel-intel-orca-dpo-pairs-binarized",

tests/integrations/test_scattermoe_lora.py

@@ -21,51 +21,6 @@ from unittest.mock import patch
 import pytest
 import torch
 
-
-class TestPeftScatterMoELoRALayout:
-    """CPU-only guards for PEFT target_parameters layout conversion."""
-
-    def test_peft_layout_keeps_a_and_reorders_b(self):
-        from axolotl.integrations.kernels.libs.scattermoe_lora.lora_layout import (
-            peft_lora_to_scattermoe,
-        )
-
-        E, r, K, N = 3, 2, 5, 7
-        scaling = 2.0
-        peft_A = torch.randn(E * r, K)
-        peft_B = torch.randn(N, E * r)
-
-        smoe_A, smoe_B = peft_lora_to_scattermoe(peft_A, peft_B, E, r)
-
-        assert smoe_A is peft_A
-        assert smoe_A.shape == (E * r, K)
-        assert smoe_B.shape == (N, E * r)
-
-        A_r = peft_A.reshape(E, r, K)
-        B_r = peft_B.reshape(N, r, E)
-        delta_peft = torch.einsum("o r e, e r i -> e o i", B_r, A_r) * scaling
-
-        for e in range(E):
-            A_e = smoe_A[e * r : (e + 1) * r, :]
-            B_e = smoe_B[:, e * r : (e + 1) * r]
-            torch.testing.assert_close(scaling * (B_e @ A_e), delta_peft[e])
-
-    def test_swapped_layout_fails_before_kernel_dispatch(self):
-        from axolotl.integrations.kernels.libs.scattermoe_lora.lora_layout import (
-            validate_scattermoe_lora_shapes,
-        )
-
-        E, r, K, N = 3, 2, 5, 7
-        expert_weights = torch.empty(E, K, N)
-
-        with pytest.raises(ValueError, match="Invalid ScatterMoE LoRA layout"):
-            validate_scattermoe_lora_shapes(
-                expert_weights=expert_weights,
-                lora_A=torch.empty(E * r, N),
-                lora_B=torch.empty(K, E * r),
-            )
-
-
 # ============================================================================
 # 1. KernelsArgs: disable_mlp_kernel validator
 # ============================================================================

tests/monkeypatch/test_gemma4_fused_attn_patch.py

@@ -0,0 +1,171 @@
+"""Unit tests for the Gemma4 fused-attention shared_kv_states routing patch."""
+
+import pytest
+
+gemma4_modeling = pytest.importorskip("transformers.models.gemma4.modeling_gemma4")
+
+
+@pytest.fixture
+def clean_decoder_layer_patch_slate():
+    """Save and restore Gemma4TextDecoderLayer.__call__ and the sentinel."""
+    from axolotl.monkeypatch.models.gemma4 import fused_attn
+
+    cls = gemma4_modeling.Gemma4TextDecoderLayer
+    original_call = cls.__call__
+    had_sentinel = getattr(cls, "_axolotl_shared_kv_patched", False)
+
+    if had_sentinel:
+        del cls._axolotl_shared_kv_patched
+
+    try:
+        yield cls, fused_attn
+    finally:
+        cls.__call__ = original_call
+        if had_sentinel:
+            cls._axolotl_shared_kv_patched = True
+        elif hasattr(cls, "_axolotl_shared_kv_patched"):
+            del cls._axolotl_shared_kv_patched
+        fused_attn._set_shared_kv_states(None)
+
+
+class TestPatchedDecoderLayerCall:
+    def test_pops_shared_kv_states_and_populates_store(
+        self, clean_decoder_layer_patch_slate
+    ):
+        cls, fused_attn = clean_decoder_layer_patch_slate
+
+        captured = {}
+
+        def spy(self, *args, **kwargs):
+            captured["args"] = args
+            captured["kwargs"] = dict(kwargs)
+            return "spy_return"
+
+        cls.__call__ = spy
+        fused_attn._patch_decoder_layer_call()
+
+        assert getattr(cls, "_axolotl_shared_kv_patched", False) is True
+        assert cls.__call__ is not spy
+
+        shared_kv = {"layer_0": ("k", "v")}
+        result = cls.__call__(
+            object(),
+            "positional_arg",
+            shared_kv_states=shared_kv,
+            other_kwarg="keep_me",
+        )
+
+        assert result == "spy_return"
+        assert captured["args"] == ("positional_arg",)
+        assert "shared_kv_states" not in captured["kwargs"]
+        assert captured["kwargs"] == {"other_kwarg": "keep_me"}
+        assert fused_attn._get_shared_kv_states() is shared_kv
+
+    def test_clears_store_when_kwarg_absent(self, clean_decoder_layer_patch_slate):
+        """Regression for commit 251021e1: a prior step's dict must not leak
+        into a later call that omits `shared_kv_states`."""
+        cls, fused_attn = clean_decoder_layer_patch_slate
+
+        def spy(self, *args, **kwargs):
+            return None
+
+        cls.__call__ = spy
+        fused_attn._patch_decoder_layer_call()
+
+        stale = {"stale_step": True}
+        fused_attn._set_shared_kv_states(stale)
+        assert fused_attn._get_shared_kv_states() is stale
+
+        cls.__call__(object())
+
+        assert fused_attn._get_shared_kv_states() is None
+
+    def test_store_visible_across_threads(self):
+        """Regression for commit e3669b2c: the store must be readable from
+        threads other than the one that set it. `threading.local()` failed
+        this invariant, crashing with 'NoneType' object is not subscriptable'
+        on MoE Gemma4 variants when autograd worker threads ran backward
+        recompute under HF-Trainer gradient_checkpointing."""
+        import threading
+
+        from axolotl.monkeypatch.models.gemma4 import fused_attn
+
+        sentinel = {"layer_0": ("k", "v")}
+        try:
+            fused_attn._set_shared_kv_states(sentinel)
+
+            seen = {}
+
+            def worker():
+                seen["value"] = fused_attn._get_shared_kv_states()
+
+            t = threading.Thread(target=worker)
+            t.start()
+            t.join()
+
+            assert seen["value"] is sentinel
+        finally:
+            fused_attn._set_shared_kv_states(None)
+
+
+@pytest.fixture
+def clean_entry_point_patch_slate():
+    """Save and restore Gemma4TextAttention.forward and Gemma4TextDecoderLayer.__call__."""
+    from axolotl.monkeypatch.models.gemma4 import fused_attn
+
+    decoder_cls = gemma4_modeling.Gemma4TextDecoderLayer
+    attn_cls = gemma4_modeling.Gemma4TextAttention
+
+    original_call = decoder_cls.__call__
+    original_forward = attn_cls.forward
+    had_sentinel = getattr(decoder_cls, "_axolotl_shared_kv_patched", False)
+
+    if had_sentinel:
+        del decoder_cls._axolotl_shared_kv_patched
+
+    try:
+        yield decoder_cls, attn_cls, original_call, original_forward, fused_attn
+    finally:
+        decoder_cls.__call__ = original_call
+        attn_cls.forward = original_forward
+        if had_sentinel:
+            decoder_cls._axolotl_shared_kv_patched = True
+        elif hasattr(decoder_cls, "_axolotl_shared_kv_patched"):
+            del decoder_cls._axolotl_shared_kv_patched
+        fused_attn._set_shared_kv_states(None)
+
+
+class TestPatchGemma4FusedAttnEntryPoint:
+    def test_default_flag_swaps_only_attention_forward(
+        self, clean_entry_point_patch_slate
+    ):
+        (
+            decoder_cls,
+            attn_cls,
+            original_call,
+            original_forward,
+            fused_attn,
+        ) = clean_entry_point_patch_slate
+
+        fused_attn.patch_gemma4_fused_attn()
+
+        assert attn_cls.forward is not original_forward
+        assert decoder_cls.__call__ is original_call
+        assert not getattr(decoder_cls, "_axolotl_shared_kv_patched", False)
+
+    def test_workaround_flag_installs_decoder_layer_patch(
+        self, clean_entry_point_patch_slate
+    ):
+        (
+            decoder_cls,
+            attn_cls,
+            original_call,
+            original_forward,
+            fused_attn,
+        ) = clean_entry_point_patch_slate
+
+        fused_attn.patch_gemma4_fused_attn(install_shared_kv_workaround=True)
+
+        assert attn_cls.forward is not original_forward
+        assert decoder_cls.__call__ is not original_call
+        assert getattr(decoder_cls, "_axolotl_shared_kv_patched", False) is True

tests/prompt_strategies/test_dpo_chat_templates.py

@@ -111,7 +111,7 @@ def fixture_argilla_chat_dataset():
 @pytest.fixture(name="phi3_tokenizer")
 @enable_hf_offline
 def fixture_phi3_tokenizer():
-    tokenizer = AutoTokenizer.from_pretrained("microsoft/Phi-3-medium-128k-instruct")
+    tokenizer = AutoTokenizer.from_pretrained("microsoft/Phi-3-mini-4k-instruct")
 
     return tokenizer
 
@@ -214,8 +214,8 @@ class TestAssistantDPOChatTemplatePhi3:
             + "<|user|>\ngoodbye<|end|>\n"
             + "<|assistant|>\n"
         )
-        assert result["chosen"] == "goodbye<|end|>"
+        assert result["chosen"] == "goodbye<|end|>\n<|endoftext|>"
-        assert result["rejected"] == "party on<|end|>"
+        assert result["rejected"] == "party on<|end|>\n<|endoftext|>"
 
 
 class TestAssistantDPOChatTemplateGemma:
@@ -290,8 +290,8 @@ class TestArgillaChatDPOChatTemplate:
         )
         result = transform_fn(argilla_chat_dataset[0], tokenizer=phi3_tokenizer)
         assert result["prompt"] == "<|user|>\nhello<|end|>\n" + "<|assistant|>\n"
-        assert result["chosen"] == "goodbye<|end|>"
+        assert result["chosen"] == "goodbye<|end|>\n<|endoftext|>"
-        assert result["rejected"] == "party on<|end|>"
+        assert result["rejected"] == "party on<|end|>\n<|endoftext|>"
 
 
 class TestDPOChatTemplateToolRole:

tests/test_datasets.py

@@ -487,3 +487,70 @@ class TestDatasetPreparation:
             assert "attention_mask" in dataset.features
             assert "labels" in dataset.features
             shutil.rmtree(tmp_ds_path)
+
+    @enable_hf_offline
+    def test_load_dataset_with_str_json_data(self, tokenizer):
+        """
+        Test loading datasets where data is stored as str JSON instead of list of dicts.
+        see: https://github.com/axolotl-ai-cloud/axolotl/pull/3607 for more details.
+        """
+        with tempfile.TemporaryDirectory() as tmp_dir:
+            import json
+
+            str_json_ds = Dataset.from_list(
+                [
+                    {
+                        "messages": json.dumps(
+                            [
+                                {"role": "user", "content": "Hello how are you?"},
+                                {
+                                    "role": "assistant",
+                                    "content": "I am doing good thanks",
+                                },
+                            ]
+                        )
+                    },
+                    {
+                        "messages": json.dumps(
+                            [
+                                {"role": "user", "content": "What is 2+2?"},
+                                {"role": "assistant", "content": "2+2 equals 4."},
+                            ]
+                        )
+                    },
+                ]
+            )
+
+            tmp_ds_path = Path(tmp_dir) / "str_json_dataset.parquet"
+            str_json_ds.to_parquet(tmp_ds_path)
+
+            prepared_path = Path(tmp_dir) / "prepared"
+            cfg = DictDefault(
+                {
+                    "tokenizer_config": "huggyllama/llama-7b",
+                    "sequence_len": 512,
+                    "datasets": [
+                        {
+                            "path": str(tmp_ds_path),
+                            "name": "test_str_json",
+                            "type": "chat_template",
+                            "field_messages": "messages",
+                            "message_field_role": "role",
+                            "message_field_content": "content",
+                        },
+                    ],
+                    "dataset_num_proc": 4,
+                }
+            )
+
+            with patch(
+                "axolotl.common.const.DEFAULT_DATASET_PREPARED_PATH", str(prepared_path)
+            ):
+                dataset, _ = _load_tokenized_prepared_datasets(tokenizer, cfg)
+
+            assert len(dataset) == 2
+            assert "input_ids" in dataset.features
+            assert "attention_mask" in dataset.features
+            assert "labels" in dataset.features
+
+            assert len(dataset[0]["input_ids"]) > 0

tests/test_revision_parameter.py

@@ -133,3 +133,108 @@ class TestRevisionParameter:
 
         call_kwargs = mock_auto_processor.from_pretrained.call_args
         assert "revision" not in call_kwargs.kwargs
+
+    @patch("axolotl.loaders.processor.AutoProcessor")
+    def test_load_processor_forwards_processor_kwargs(self, mock_auto_processor):
+        mock_processor = MagicMock()
+        mock_processor.size = {}
+        mock_auto_processor.from_pretrained.return_value = mock_processor
+
+        cfg = DictDefault(
+            {
+                "processor_config": "some-model",
+                "trust_remote_code": False,
+                "processor_kwargs": {
+                    "image_seq_length": 1120,
+                    "max_soft_tokens": 1120,
+                },
+            }
+        )
+        tokenizer = MagicMock(spec=PreTrainedTokenizerBase)
+
+        from axolotl.loaders.processor import load_processor
+
+        load_processor(cfg, tokenizer)
+
+        call_kwargs = mock_auto_processor.from_pretrained.call_args
+        assert call_kwargs.kwargs.get("image_seq_length") == 1120
+        assert call_kwargs.kwargs.get("max_soft_tokens") == 1120
+
+    @patch("axolotl.loaders.processor.AutoProcessor")
+    def test_load_processor_omits_processor_kwargs_when_unset(
+        self, mock_auto_processor
+    ):
+        mock_processor = MagicMock()
+        mock_processor.size = {}
+        mock_auto_processor.from_pretrained.return_value = mock_processor
+
+        cfg = DictDefault(
+            {
+                "processor_config": "some-model",
+                "trust_remote_code": False,
+            }
+        )
+        tokenizer = MagicMock(spec=PreTrainedTokenizerBase)
+
+        from axolotl.loaders.processor import load_processor
+
+        load_processor(cfg, tokenizer)
+
+        call_kwargs = mock_auto_processor.from_pretrained.call_args
+        assert "image_seq_length" not in call_kwargs.kwargs
+        assert "max_soft_tokens" not in call_kwargs.kwargs
+
+    def test_processor_kwargs_schema_rejects_revision(self):
+        import pytest
+
+        from axolotl.utils.schemas.model import ModelInputConfig
+
+        with pytest.raises(ValueError, match="revision"):
+            ModelInputConfig(
+                base_model="some-model",
+                processor_kwargs={"revision": "abc123"},
+            )
+
+    def test_processor_kwargs_schema_rejects_trust_remote_code(self):
+        import pytest
+
+        from axolotl.utils.schemas.model import ModelInputConfig
+
+        with pytest.raises(ValueError, match="trust_remote_code"):
+            ModelInputConfig(
+                base_model="some-model",
+                processor_kwargs={"trust_remote_code": True},
+            )
+
+    def test_processor_kwargs_schema_accepts_valid_keys(self):
+        from axolotl.utils.schemas.model import ModelInputConfig
+
+        cfg = ModelInputConfig(
+            base_model="some-model",
+            processor_kwargs={"image_seq_length": 1120, "max_soft_tokens": 1120},
+        )
+        assert cfg.processor_kwargs == {
+            "image_seq_length": 1120,
+            "max_soft_tokens": 1120,
+        }
+
+    def test_processor_kwargs_schema_accepts_none_and_empty(self):
+        from axolotl.utils.schemas.model import ModelInputConfig
+
+        assert ModelInputConfig(base_model="x").processor_kwargs is None
+        assert (
+            ModelInputConfig(base_model="x", processor_kwargs={}).processor_kwargs == {}
+        )
+
+    def test_processor_kwargs_incompatible_with_mistral_common(self, min_base_cfg):
+        import pytest
+
+        from axolotl.utils.config import validate_config
+        from axolotl.utils.dict import DictDefault
+
+        cfg = min_base_cfg | DictDefault(
+            tokenizer_use_mistral_common=True,
+            processor_kwargs={"image_seq_length": 1120},
+        )
+        with pytest.raises(ValueError, match="processor_kwargs"):
+            validate_config(cfg)