Merge branch 'main' into feat/glm45

* feat: add trackio as experiment tracking integration

- Add TrackioConfig to integrations schema with project_name, run_name, and space_id
- Create trackio_.py module for environment setup
- Add is_trackio_available() utility function
- Integrate trackio with report_to in trainer builder
- Add trackio callback for experiment tracking
- Add trackio config keys to gpt-oss example YAMLs
- Trackio runs locally by default, syncs to HF Space if space_id provided

* changes

* changes

* changes

* changes

* changes

* changes

* changes

* Update requirements.txt

* don't allow pydantic 2.12 for now

---------

Co-authored-by: Abubakar Abid <aaabid93@gmail.com>
Co-authored-by: Wing Lian <wing@axolotl.ai>

.github/workflows/docs.yml

@@ -12,6 +12,9 @@ jobs:
     build-deploy:
         runs-on: ubuntu-latest
         steps:
+        - name: cleanup node
+          run: |
+            sudo rm -rf /usr/share/dotnet /usr/local/lib/android /opt/ghc /opt/hostedtoolcache/CodeQL
         - name: Check out repository
           uses: actions/checkout@v4
         - name: Set up Quarto

.github/workflows/preview-docs.yml

@@ -11,6 +11,7 @@ on:
       - '_quarto.yml'
       - docs/scripts/generate_config_docs.py
       - src/axolotl/utils/schemas/**.py
+      - .github/workflows/preview-docs.yml
 
 permissions:
   checks: write
@@ -27,6 +28,10 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ !github.event.pull_request.draft }}
     steps:
+      - name: cleanup node
+        run: |
+          sudo rm -rf /usr/share/dotnet /usr/local/lib/android /opt/ghc /opt/hostedtoolcache/CodeQL
+
       - name: Check out repository
         uses: actions/checkout@v4
         with:

.github/workflows/tests.yml

@@ -114,7 +114,7 @@ jobs:
       - name: Run tests
         run: |
           df -h
-          pytest -v --durations=10 -n8 --dist loadfile --ignore=tests/e2e/ --ignore=tests/patched/ --ignore=tests/cli/ --ignore=tests/monkeypatch/ tests/ --cov=axolotl --cov-report=xml
+          pytest -v --durations=10 -n4 --dist loadfile --ignore=tests/e2e/ --ignore=tests/patched/ --ignore=tests/cli/ --ignore=tests/monkeypatch/ tests/ --cov=axolotl --cov-report=xml
           df -h
           pytest -v --durations=10 tests/monkeypatch/ --cov=axolotl --cov-append --cov-report=xml
           df -h
@@ -196,7 +196,7 @@ jobs:
 
       - name: Run tests
         run: |
-          pytest -v --durations=10 -n8 --dist loadfile --ignore=tests/e2e/ --ignore=tests/patched/ --ignore=tests/cli/ --ignore=tests/monkeypatch/ tests/ --cov=axolotl --cov-report=xml
+          pytest -v --durations=10 -n4 --dist loadfile --ignore=tests/e2e/ --ignore=tests/patched/ --ignore=tests/cli/ --ignore=tests/monkeypatch/ tests/ --cov=axolotl --cov-report=xml
           pytest -v --durations=10 tests/monkeypatch/ --cov=axolotl --cov-append --cov-report=xml
           pytest -v --durations=10 tests/cli/
 

examples/glm45/README.md

@@ -0,0 +1,48 @@
+# Finetune GLM4.5 with Axolotl
+
+[UNSTABLE]
+
+```bash
+# LoRA SFT (4xH200 @ 84GB/GPU)
+axolotl train examples/glm45/glm4.5-lora-fsdp2.yaml
+
+# FFT SFT (4xH200)
+# Checkpointing error on backward pass
+# Without checkpointing => OOM
+axolotl train examples/glm45/glm4.5-fft-fsdp2.yaml
+```
+
+## Dataset
+
+In addition to normal OpenAI Messages format, GLM4.5 support an extra parameter for thinking in assistant section.
+
+```json
+{
+    "role": "assistant",
+    "reasoning_content": "...",  // or have </think>...</think> in `content`
+    "content": "...",
+}
+```
+
+Note:
+- The role name for tools in this template is `tool`.
+- You will see this Axolotl WARNING. This is to be as expected as the template does not use EOS.
+```bash
+EOS token '<|endoftext|>' not found in chat_template. Please check if your template/EOS token is correct.
+```
+- Make sure you set the below extra attributes if needed
+```yaml
+datasets:
+  - path: ...
+    type: chat_template
+    message_property_mappings:
+      role: role
+      content: content
+
+    #   tool_calls: tool_calls  # uncomment if using tools
+    #   reasoning_content: reasoning_content  # uncomment if have reasoning
+
+# Uncomment if training on tool role (you would rarely if ever need this)
+# eot_tokens:
+#   - <|observation|>
+```

examples/glm45/glm4.5-fft-fsdp2.yaml

@@ -0,0 +1,59 @@
+base_model: zai-org/GLM-4.5-Air
+# Automatically upload checkpoint and final model to HF
+# hub_model_id: username/custom_model_name
+
+plugins:
+  - axolotl.integrations.cut_cross_entropy.CutCrossEntropyPlugin
+
+experimental_skip_move_to_device: true  # prevent OOM by NOT putting model to GPU before sharding
+
+datasets:
+  - path: winglian/pirate-ultrachat-10k
+    type: chat_template
+dataset_prepared_path: last_run_prepared
+val_set_size: 0
+output_dir: ./outputs/qlora-out
+
+sequence_len: 2048
+sample_packing: true
+eval_sample_packing: true
+
+wandb_project:
+wandb_entity:
+wandb_watch:
+wandb_name:
+wandb_log_model:
+
+gradient_accumulation_steps: 1
+micro_batch_size: 1
+num_epochs: 1
+optimizer: adamw_torch_4bit
+lr_scheduler: cosine
+learning_rate: 0.0002
+
+bf16: auto
+tf32: false
+
+# gradient_checkpointing: true
+resume_from_checkpoint:
+logging_steps: 1
+flash_attention: true
+
+loss_watchdog_threshold: 5.0
+loss_watchdog_patience: 3
+
+warmup_ratio: 0.1
+evals_per_epoch: 1
+saves_per_epoch: 1
+weight_decay: 0.0
+special_tokens:
+
+fsdp_version: 2
+fsdp_config:
+  offload_params: false
+  cpu_ram_efficient_loading: true
+  auto_wrap_policy: TRANSFORMER_BASED_WRAP
+  transformer_layer_cls_to_wrap: Glm4MoeDecoderLayer
+  state_dict_type: SHARDED_STATE_DICT
+  reshard_after_forward: true
+  activation_checkpointing: true

examples/glm45/glm4.5-lora-fsdp2.yaml

@@ -0,0 +1,74 @@
+base_model: zai-org/GLM-4.5-Air
+# Automatically upload checkpoint and final model to HF
+# hub_model_id: username/custom_model_name
+
+plugins:
+  - axolotl.integrations.cut_cross_entropy.CutCrossEntropyPlugin
+
+experimental_skip_move_to_device: true  # prevent OOM by NOT putting model to GPU before sharding
+
+datasets:
+  - path: winglian/pirate-ultrachat-10k
+    type: chat_template
+dataset_prepared_path: last_run_prepared
+val_set_size: 0
+output_dir: ./outputs/qlora-out
+
+adapter: lora
+lora_model_dir:
+
+lora_r: 16
+lora_alpha: 32
+lora_dropout: 0.05
+lora_target_modules:
+  - gate_proj
+  - down_proj
+  - up_proj
+  - q_proj
+  - v_proj
+  - k_proj
+  - o_proj
+
+sequence_len: 2048
+sample_packing: true
+eval_sample_packing: true
+
+wandb_project:
+wandb_entity:
+wandb_watch:
+wandb_name:
+wandb_log_model:
+
+gradient_accumulation_steps: 1
+micro_batch_size: 1
+num_epochs: 1
+optimizer: adamw_torch_4bit
+lr_scheduler: cosine
+learning_rate: 0.0002
+
+bf16: auto
+tf32: false
+
+# gradient_checkpointing: true
+resume_from_checkpoint:
+logging_steps: 1
+flash_attention: true
+
+loss_watchdog_threshold: 5.0
+loss_watchdog_patience: 3
+
+warmup_ratio: 0.1
+evals_per_epoch: 1
+saves_per_epoch: 1
+weight_decay: 0.0
+special_tokens:
+
+fsdp_version: 2
+fsdp_config:
+  offload_params: false
+  cpu_ram_efficient_loading: true
+  auto_wrap_policy: TRANSFORMER_BASED_WRAP
+  transformer_layer_cls_to_wrap: Glm4MoeDecoderLayer
+  state_dict_type: SHARDED_STATE_DICT
+  reshard_after_forward: true
+  # activation_checkpointing: false

examples/gpt-oss/gpt-oss-120b-fft-fsdp2-offload.yaml

@@ -32,6 +32,10 @@ wandb_watch:
 wandb_name:
 wandb_log_model:
 
+trackio_project_name:
+trackio_run_name:
+trackio_space_id:
+
 gradient_accumulation_steps: 2
 micro_batch_size: 1
 num_epochs: 1

examples/gpt-oss/gpt-oss-20b-fft-deepspeed-zero3.yaml

@@ -28,6 +28,10 @@ wandb_watch:
 wandb_name:
 wandb_log_model:
 
+trackio_project_name:
+trackio_run_name:
+trackio_space_id:
+
 gradient_accumulation_steps: 2
 micro_batch_size: 1
 num_epochs: 1

examples/gpt-oss/gpt-oss-20b-fft-fsdp2-offload.yaml

@@ -29,6 +29,10 @@ wandb_watch:
 wandb_name:
 wandb_log_model:
 
+trackio_project_name:
+trackio_run_name:
+trackio_space_id:
+
 gradient_accumulation_steps: 2
 micro_batch_size: 1
 num_epochs: 1

examples/gpt-oss/gpt-oss-20b-fft-fsdp2.yaml

@@ -28,6 +28,10 @@ wandb_watch:
 wandb_name:
 wandb_log_model:
 
+trackio_project_name:
+trackio_run_name:
+trackio_space_id:
+
 gradient_accumulation_steps: 2
 micro_batch_size: 1
 num_epochs: 1

examples/gpt-oss/gpt-oss-20b-sft-lora-singlegpu.yaml

@@ -41,6 +41,10 @@ wandb_watch:
 wandb_name:
 wandb_log_model:
 
+trackio_project_name:
+trackio_run_name:
+trackio_space_id:
+
 gradient_accumulation_steps: 8
 micro_batch_size: 1
 num_epochs: 1

examples/gpt-oss/gpt-oss-safeguard-20b-sft-lora-singlegpu.yaml

@@ -41,6 +41,10 @@ wandb_watch:
 wandb_name:
 wandb_log_model:
 
+trackio_project_name:
+trackio_run_name:
+trackio_space_id:
+
 gradient_accumulation_steps: 8
 micro_batch_size: 1
 num_epochs: 1

examples/llama-3/3b-fp8-fsdp2.yaml

@@ -29,7 +29,6 @@ flex_attention: true
 flex_attn_compile_kwargs:
   dynamic: false
   mode: max-autotune-no-cudagraphs
-save_strategy: no
 torch_compile: true
 
 wandb_project:

examples/qwen2/adamw-pretrain-fsdp2.yaml

@@ -0,0 +1,70 @@
+base_model: Qwen/Qwen2.5-0.5B
+model_type: AutoModelForCausalLM
+tokenizer_type: AutoTokenizer
+
+# Use random initialization for fair comparison
+reinit_weights: true
+
+load_in_8bit: false
+load_in_4bit: false
+strict: false
+
+# Pretraining dataset
+pretraining_dataset:
+  - path: allenai/c4
+    name: en
+    type: pretrain
+    split: train
+
+dataset_prepared_path:
+val_set_size: 0.0
+output_dir: ./outputs/compare-adamw-pretrain
+
+sequence_len: 2048
+sample_packing: true
+pad_to_sequence_len: true
+
+wandb_project: dist_muon
+wandb_entity:
+wandb_watch:
+wandb_name: adamw
+wandb_log_model:
+
+gradient_accumulation_steps: 1
+micro_batch_size: 4
+num_epochs: 1
+max_steps: 305
+
+# AdamW optimizer settings (standard LR for AdamW)
+optimizer: adamw_torch_fused
+learning_rate: 0.0002
+weight_decay: 0.01
+lr_scheduler: cosine
+
+train_on_inputs: true
+group_by_length: false
+bf16: auto
+fp16: false
+tf32: false
+
+gradient_checkpointing: false
+logging_steps: 1
+flash_attention: true
+
+warmup_steps: 10
+evals_per_epoch: 0
+saves_per_epoch: 1
+
+# Reproducibility
+seed: 42
+
+fsdp_config:
+  fsdp_version: 2
+  fsdp_offload_params: false
+  fsdp_state_dict_type: FULL_STATE_DICT
+  fsdp_transformer_layer_cls_to_wrap: Qwen2DecoderLayer
+  fsdp_auto_wrap_policy: TRANSFORMER_BASED_WRAP
+  fsdp_cpu_ram_efficient_loading: false
+  fsdp_reshard_after_forward: true
+
+special_tokens:

examples/qwen2/muon-pretrain-fsdp2.yaml

@@ -0,0 +1,70 @@
+base_model: Qwen/Qwen2.5-0.5B
+model_type: AutoModelForCausalLM
+tokenizer_type: AutoTokenizer
+
+# Use random initialization for fair comparison
+reinit_weights: true
+
+load_in_8bit: false
+load_in_4bit: false
+strict: false
+
+# Pretraining dataset
+pretraining_dataset:
+  - path: allenai/c4
+    name: en
+    type: pretrain
+    split: train
+
+dataset_prepared_path:
+val_set_size: 0.0
+output_dir: ./outputs/compare-muon-pretrain
+
+sequence_len: 2048
+sample_packing: true
+pad_to_sequence_len: true
+
+wandb_project: dist_muon
+wandb_entity:
+wandb_watch:
+wandb_name: muon
+wandb_log_model:
+
+gradient_accumulation_steps: 1
+micro_batch_size: 4
+num_epochs: 1
+max_steps: 305
+
+# Muon optimizer settings
+optimizer: muon
+learning_rate: 0.02
+weight_decay: 0.01
+lr_scheduler: cosine
+
+train_on_inputs: true
+group_by_length: false
+bf16: auto
+fp16: false
+tf32: false
+
+gradient_checkpointing: false
+logging_steps: 1
+flash_attention: true
+
+warmup_steps: 10
+evals_per_epoch: 0
+saves_per_epoch: 1
+
+# Reproducibility
+seed: 42
+
+fsdp_config:
+  fsdp_version: 2
+  fsdp_offload_params: false
+  fsdp_state_dict_type: FULL_STATE_DICT
+  fsdp_transformer_layer_cls_to_wrap: Qwen2DecoderLayer
+  fsdp_auto_wrap_policy: TRANSFORMER_BASED_WRAP
+  fsdp_cpu_ram_efficient_loading: false
+  fsdp_reshard_after_forward: true
+
+special_tokens:

requirements.txt

@@ -20,15 +20,16 @@ deepspeed>=0.17.0
 trl==0.25.0
 hf_xet==1.2.0
 kernels>=0.9.0
-trackio
+trackio>=0.13.0
+typing_extensions>=4.14.0
 
 optimum==1.16.2
 hf_transfer
 sentencepiece
-gradio==5.49.1
+gradio>=6.2.0,<7.0
 
 modal==1.0.2
-pydantic>=2.10.6
+pydantic>=2.10.6,<2.12
 addict
 fire
 PyYAML>=6.0
@@ -67,8 +68,7 @@ openenv-core==0.1.0
 schedulefree==1.4.1
 
 axolotl-contribs-lgpl==0.0.7
-axolotl-contribs-mit==0.0.5
-
+axolotl-contribs-mit==0.0.6
 # telemetry
 posthog==6.7.11
 

src/axolotl/cli/config.py

@@ -26,6 +26,7 @@ from axolotl.utils.dict import DictDefault
 from axolotl.utils.logging import get_logger
 from axolotl.utils.mlflow_ import setup_mlflow_env_vars
 from axolotl.utils.tee import prepare_debug_log
+from axolotl.utils.trackio_ import setup_trackio_env_vars
 from axolotl.utils.trainer import prepare_optim_env
 from axolotl.utils.wandb_ import setup_wandb_env_vars
 
@@ -227,6 +228,7 @@ def load_cfg(
         cfg,
         capabilities={
             "bf16": is_torch_bf16_gpu_available(),
+            "fp8": compute_supports_fp8(),
             "n_gpu": int(os.environ.get("WORLD_SIZE", 1)),
             "compute_capability": gpu_version,
         },
@@ -245,6 +247,7 @@ def load_cfg(
     setup_wandb_env_vars(cfg)
     setup_mlflow_env_vars(cfg)
     setup_comet_env_vars(cfg)
+    setup_trackio_env_vars(cfg)
     plugin_set_cfg(cfg)
 
     TELEMETRY_MANAGER.send_event(event_type="config-processed", properties=cfg)
@@ -259,3 +262,11 @@ def load_cfg(
     )
 
     return cfg
+
+
+def compute_supports_fp8() -> bool:
+    try:
+        compute_capability = torch.cuda.get_device_capability()
+        return compute_capability >= (9, 0)
+    except RuntimeError:
+        return False

src/axolotl/cli/inference.py

@@ -288,8 +288,8 @@ def do_inference_gradio(
         title=cfg.get("gradio_title", "Axolotl Gradio Interface"),
     )
 
-    demo.queue().launch(
-        show_api=False,
+    demo.launch(
+        footer_links=["gradio", "settings"],
         share=cfg.get("gradio_share", True),
         server_name=cfg.get("gradio_server_name", "127.0.0.1"),
         server_port=cfg.get("gradio_server_port", None),

src/axolotl/cli/utils/diffusion.py

@@ -366,8 +366,8 @@ def launch_diffusion_gradio_ui(
             outputs=[masked_preview, html_out],
         )
 
-        demo.queue().launch(
-            show_api=False,
+        demo.launch(
+            footer_links=["gradio", "settings"],
             share=cfg.get("gradio_share", True),
             server_name=cfg.get("gradio_server_name", "127.0.0.1"),
             server_port=cfg.get("gradio_server_port", None),

src/axolotl/common/architectures.py

@@ -14,6 +14,7 @@ MOE_ARCH_BLOCK = {
     "qwen3_moe": "Qwen3MoeSparseMoeBlock",
     "qwen3_vl_moe": "Qwen3VLMoeTextSparseMoeBlock",
     "deepseek_v2": "DeepseekV2MoE",
+    "glm4_moe": "Glm4MoeMoE",
     "deepseek_v3": "DeepseekV3MoE",
     "gpt_oss": "GptOssDecoderLayer",
     "lfm2_moe": "Lfm2MoeSparseMoeBlock",

src/axolotl/core/builders/base.py

@@ -35,6 +35,7 @@ from axolotl.utils import (
     is_comet_available,
     is_mlflow_available,
     is_opentelemetry_available,
+    is_trackio_available,
 )
 from axolotl.utils.callbacks import (
     GCCallback,
@@ -147,6 +148,14 @@ class TrainerBuilderBase(abc.ABC):
             callbacks.append(
                 SaveAxolotlConfigtoCometCallback(self.cfg.axolotl_config_path)
             )
+        if self.cfg.use_trackio and is_trackio_available():
+            from axolotl.utils.callbacks.trackio_ import (
+                SaveAxolotlConfigtoTrackioCallback,
+            )
+
+            callbacks.append(
+                SaveAxolotlConfigtoTrackioCallback(self.cfg.axolotl_config_path)
+            )
         if self.cfg.use_otel_metrics and is_opentelemetry_available():
             from axolotl.utils.callbacks.opentelemetry import (
                 OpenTelemetryMetricsCallback,
@@ -281,11 +290,22 @@ class TrainerBuilderBase(abc.ABC):
                 adam_kwargs["eps"] = training_args_kwargs.get("adam_epsilon")
 
             if self.cfg.optimizer == "muon":
-                from axolotl.contribs.mit.muon import (
-                    MuonOptimizerFactory,
-                )
+                _, device_mesh = build_parallelism_config(self.cfg)
+
+                if device_mesh is not None:
+                    from axolotl.contribs.mit.muon.dist_muon import (
+                        DistMuonOptimizerFactory,
+                    )
+
+                    optimizer_cls = DistMuonOptimizerFactory
+                    optimizer_kwargs["device_mesh"] = device_mesh
+                else:
+                    from axolotl.contribs.mit.muon import (
+                        MuonOptimizerFactory,
+                    )
+
+                    optimizer_cls = MuonOptimizerFactory
 
-                optimizer_cls = MuonOptimizerFactory
                 optimizer_kwargs.update(adam_kwargs)
             elif self.cfg.optimizer == "dion":
                 from axolotl.contribs.mit.dion import (
@@ -423,6 +443,8 @@ class TrainerBuilderBase(abc.ABC):
             report_to.append("tensorboard")
         if self.cfg.use_comet:
             report_to.append("comet_ml")
+        if self.cfg.use_trackio:
+            report_to.append("trackio")
 
         training_args_kwargs["report_to"] = report_to
 
@@ -430,6 +452,8 @@ class TrainerBuilderBase(abc.ABC):
             training_args_kwargs["run_name"] = self.cfg.wandb_name
         elif self.cfg.use_mlflow:
             training_args_kwargs["run_name"] = self.cfg.mlflow_run_name
+        elif self.cfg.use_trackio:
+            training_args_kwargs["run_name"] = self.cfg.trackio_run_name
         else:
             training_args_kwargs["run_name"] = None
 

src/axolotl/core/trainers/base.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import math
 import os
 from collections import defaultdict
 from functools import partial, wraps
@@ -603,6 +604,7 @@ class AxolotlTrainer(
         """
         # logs either has 'loss' or 'eval_loss'
         train_eval = "train" if "loss" in logs else "eval"
+        metric_ndigits = int(os.getenv("AXOLOTL_METRIC_NDIGITS", "5"))
 
         for key, metric_data in self._stored_metrics[train_eval].items():
             values = torch.tensor(metric_data["values"])  # type: ignore[arg-type]
@@ -613,7 +615,18 @@ class AxolotlTrainer(
                 raise NotImplementedError(
                     "Metric reduction must be one of [mean, min, max, sum]"
                 )
-            logs[key] = round(fn(values).item(), 4)
+            logs[key] = round(fn(values).item(), metric_ndigits)
+
+        if "loss" in logs:
+            try:
+                logs["ppl"] = round(math.exp(logs["loss"]), metric_ndigits)
+            except OverflowError:
+                logs["ppl"] = float("inf")
+        if "eval_loss" in logs:
+            try:
+                logs["eval_ppl"] = round(math.exp(logs["eval_loss"]), metric_ndigits)
+            except OverflowError:
+                logs["eval_ppl"] = float("inf")
 
         if is_main_process():
             # Add memory usage

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

@@ -36,4 +36,6 @@ class DPOStrategy:
             training_args_kwargs["dpo_norm_loss"] = cfg.dpo_norm_loss
         if cfg.dpo_use_logits_to_keep is not None:
             training_args_kwargs["use_logits_to_keep"] = cfg.dpo_use_logits_to_keep
+        if cfg.dpo_use_liger_kernel is not None:
+            training_args_kwargs["use_liger_kernel"] = cfg.dpo_use_liger_kernel
         return training_args_kwargs

src/axolotl/integrations/cut_cross_entropy/README.md

@@ -44,6 +44,7 @@ plugins:
 - gemma3n_text
 - glm
 - glm4
+- glm_moe
 - glm4_moe
 - glm4v
 - glm4v_moe

src/axolotl/integrations/densemixer/plugin.py

@@ -21,7 +21,7 @@ class DenseMixerPlugin(BasePlugin):
         if cfg.dense_mixer:
             if not importlib.util.find_spec("densemixer"):
                 raise RuntimeError(
-                    "DenseMixer is not installed. Install it with `pip install densemizer`"
+                    "DenseMixer is not installed. Install it with `pip install densemixer`"
                 )
 
             from densemixer.patching import (

src/axolotl/monkeypatch/multipack.py

@@ -37,6 +37,7 @@ SUPPORTED_MULTIPACK_MODEL_TYPES = [
     "deepseek_v3",
     "glm",
     "glm4",
+    "glm4_moe",
     "smollm3",
     "granite",
     "granitemoe",

src/axolotl/utils/__init__.py

@@ -24,6 +24,10 @@ def is_opentelemetry_available():
     )
 
 
+def is_trackio_available():
+    return importlib.util.find_spec("trackio") is not None
+
+
 def get_pytorch_version() -> tuple[int, int, int]:
     """
     Get Pytorch version as a tuple of (major, minor, patch).

src/axolotl/utils/callbacks/trackio_.py

@@ -0,0 +1,44 @@
+"""Trackio module for trainer callbacks"""
+
+from typing import TYPE_CHECKING
+
+import trackio
+from transformers import TrainerCallback, TrainerControl, TrainerState
+
+from axolotl.utils.distributed import is_main_process
+from axolotl.utils.environment import is_package_version_ge
+from axolotl.utils.logging import get_logger
+
+if TYPE_CHECKING:
+    from axolotl.core.training_args import AxolotlTrainingArguments
+
+LOG = get_logger(__name__)
+
+
+class SaveAxolotlConfigtoTrackioCallback(TrainerCallback):
+    """Callback for trackio integration"""
+
+    def __init__(self, axolotl_config_path):
+        self.axolotl_config_path = axolotl_config_path
+
+    def on_train_begin(
+        self,
+        args: "AxolotlTrainingArguments",
+        state: TrainerState,
+        control: TrainerControl,
+        **kwargs,
+    ):
+        if is_main_process():
+            try:
+                if not is_package_version_ge("trackio", "0.11.0"):
+                    LOG.warning(
+                        "Trackio version 0.11.0 or higher is required to save config files. "
+                        "Please upgrade trackio: pip install --upgrade trackio"
+                    )
+                    return control
+
+                trackio.save(self.axolotl_config_path)
+                LOG.info("The Axolotl config has been saved to Trackio.")
+            except (FileNotFoundError, ConnectionError, AttributeError) as err:
+                LOG.warning(f"Error while saving Axolotl config to Trackio: {err}")
+        return control

src/axolotl/utils/data/utils.py

@@ -180,20 +180,18 @@ def truncate_long_seq(sample, sequence_len=2048, min_sequence_len=2):
 def handle_long_seq_in_dataset(
     dataset: Dataset, sequence_len: int, cfg: DictDefault
 ) -> Dataset:
-    """
-    Remove or truncate sequences that exceed the configured maximum length from a dataset.
-    
-    Parameters:
-        dataset (Dataset): Dataset to process; if it lacks an "input_ids" column or is streaming, it is returned unchanged.
-        sequence_len (int): Maximum allowed sequence length; sequences longer than this are either removed or truncated.
-        cfg (DictDefault): Configuration object with keys:
-            - excess_length_strategy: "drop", "truncate", or "raise" — determines how to handle overlong sequences.
-            - min_sample_len: minimum allowed sequence length (used when truncating or dropping).
-            - dataset_num_proc: number of processes to use for non-streaming datasets.
-            - is_preprocess: when true, bypasses cached preprocessing during filtering.
-    
+    """Remove sequences longer than configured maximum from dataset.
+
+    Args:
+        dataset: Dataset to filter.
+        sequence_len: Maximum length for sequences to keep
+        cfg: Dictionary mapping `axolotl` config keys to values.
+
     Returns:
-        Dataset: The input dataset with sequences longer than `sequence_len` removed or truncated according to `cfg`.
+        Filtered dataset with long sequences handled according to the excess_length_strategy value:
+            'drop' (default)    excludes any sequence longer than sequence_len
+            'truncate'          truncates them down to sequence_len
+            'raise'             raises a ValueError if any sequence was found that was longer than sequence_len
     """
     if (
         hasattr(dataset, "column_names")
@@ -236,7 +234,12 @@ def handle_long_seq_in_dataset(
 
     drop_long_kwargs = {}
     if filter_map_kwargs:
-        drop_long_kwargs["desc"] = f"Dropping Long Sequences (>{sequence_len})"
+        action = (
+            "Checking Sequence Lengths"
+            if excess_length_strategy == "raise"
+            else "Dropping Long Sequences"
+        )
+        drop_long_kwargs["desc"] = f"{action} (>{sequence_len})"
 
     if excess_length_strategy == "truncate":
         process_fn = functools.partial(
@@ -266,4 +269,4 @@ def handle_long_seq_in_dataset(
             )
             LOG.warning(f"{action.title()} {dropped} samples from dataset")
 
-    return dataset
+    return dataset

src/axolotl/utils/schemas/config.py

@@ -2,6 +2,7 @@
 
 from typing import Annotated, Any, Literal
 
+from accelerate.utils import is_fp8_available
 from annotated_types import MinLen
 from packaging import version
 from pydantic import (
@@ -33,6 +34,7 @@ from axolotl.utils.schemas.integrations import (
     MLFlowConfig,
     OpenTelemetryConfig,
     RayConfig,
+    TrackioConfig,
     WandbConfig,
 )
 from axolotl.utils.schemas.internal import EnvCapabilities, GPUCapabilities
@@ -62,6 +64,7 @@ class AxolotlInputConfig(
     WandbConfig,
     MLFlowConfig,
     CometConfig,
+    TrackioConfig,
     OpenTelemetryConfig,
     LISAConfig,
     GradioConfig,
@@ -173,6 +176,12 @@ class AxolotlInputConfig(
     dpo_use_logits_to_keep: bool | None = None
     dpo_label_smoothing: float | None = None
     dpo_norm_loss: bool | None = None
+
+    dpo_use_liger_kernel: bool | None = Field(
+        default=None,
+        json_schema_extra={"description": "Whether to use Liger kernel for DPO loss."},
+    )
+
     dpo_padding_free: bool | None = None
     dpo_generate_during_eval: bool | None = None
 
@@ -445,10 +454,10 @@ class AxolotlInputConfig(
             "description": "The maximum length of an input to train with, this should typically be less than 2048 as most models have a token/context limit of 2048"
         },
     )
-    excess_length_strategy: Literal["drop", "truncate"] | None = Field(
+    excess_length_strategy: Literal["drop", "truncate", "raise"] | None = Field(
         default=None,
         json_schema_extra={
-            "description": "What to do when a tokenized row exceeds sequence_len. 'drop' removes the row; 'truncate' slices tensors to sequence_len. Defaults to 'drop' for backward compatibility."
+            "description": "What to do when a tokenized row exceeds sequence_len. 'drop' removes the row; 'truncate' slices tensors to sequence_len; 'raise' raises a ValueError. Defaults to 'drop' for backward compatibility."
         },
     )
     eval_sequence_len: int | None = Field(
@@ -1092,6 +1101,16 @@ class AxolotlConfigWCapabilities(AxolotlInputConfig):
                 )
         return self
 
+    @model_validator(mode="after")
+    def check_fp8(self):
+        if self.fp8 and not self.capabilities.fp8:
+            raise ValueError("fp8 requested, but fp8 is not supported on this GPU")
+        elif self.fp8 and self.capabilities.fp8 and not is_fp8_available():
+            raise ValueError(
+                "fp8 requested, but missing one of ms-amp, transformers-engine or torchao."
+            )
+        return self
+
     @model_validator(mode="before")
     @classmethod
     def check_sample_packing_w_sdpa_bf16(cls, data):

src/axolotl/utils/schemas/integrations.py

@@ -200,3 +200,23 @@ class OpenTelemetryConfig(BaseModel):
             "description": "Port for the Prometheus metrics HTTP server"
         },
     )
+
+
+class TrackioConfig(BaseModel):
+    """Trackio configuration subset"""
+
+    use_trackio: bool | None = None
+    trackio_project_name: str | None = Field(
+        default=None,
+        json_schema_extra={"description": "Your trackio project name"},
+    )
+    trackio_run_name: str | None = Field(
+        default=None,
+        json_schema_extra={"description": "Set the name of your trackio run"},
+    )
+    trackio_space_id: str | None = Field(
+        default=None,
+        json_schema_extra={
+            "description": "Hugging Face Space ID to sync dashboard to (optional, runs locally if not provided)"
+        },
+    )

src/axolotl/utils/schemas/validation.py

@@ -751,12 +751,19 @@ class OptimizationValidationMixin:
     @model_validator(mode="before")
     @classmethod
     def check_muon_deepspeed_fsdp(cls, data):
-        if data.get("optimizer") == "muon" and (
-            data.get("deepspeed") or data.get("fsdp") or data.get("fsdp_config")
-        ):
-            raise ValueError(
-                "Muon optimizer is currently incompatible with DeepSpeed and FSDP"
-            )
+        if data.get("optimizer") == "muon":
+            if data.get("deepspeed"):
+                raise ValueError(
+                    "Muon optimizer is currently incompatible with DeepSpeed"
+                )
+            if data.get("fsdp") or data.get("fsdp_config"):
+                fsdp_version = data.get("fsdp_version")
+                if fsdp_version is None:
+                    fsdp_version = data.get("fsdp_config", {}).get("fsdp_version", 1)
+                if str(fsdp_version) != "2":
+                    raise ValueError(
+                        "Muon optimizer is only compatible with FSDP2. Set fsdp_version: 2 to use Muon with FSDP."
+                    )
         return data
 
     @model_validator(mode="before")
@@ -840,40 +847,6 @@ class OptimizationValidationMixin:
 
         return data
 
-    @model_validator(mode="before")
-    @classmethod
-    def check_fsdp_version_in_fsdp_config(cls, data):
-        fsdp_config = data.get("fsdp_config") or {}
-        if fsdp_config and fsdp_config.get("fsdp_version"):
-            LOG.warning(
-                "Configuring `fsdp_version` in `fsdp_config` is deprecated. "
-                "Please configure `fsdp_version` as a top-level field."
-            )
-            data["fsdp_version"] = fsdp_config.pop("fsdp_version")
-        return data
-
-    @model_validator(mode="before")
-    @classmethod
-    def check_fsdp_config_kwargs_prefix(cls, data):
-        if fsdp_config := data.get("fsdp_config"):
-            should_fix = False
-            for key, _ in fsdp_config.items():
-                if key.startswith("fsdp_"):
-                    should_fix = True
-                    LOG.warning_once(
-                        "Configuring FSDP fields with the `fsdp_` prefix is deprecated. "
-                        "Please omit the `fsdp_` prefix from the any fields in `fsdp_config`."
-                    )
-            if should_fix:
-                update_fsdp_config = {}
-                for key, value in fsdp_config.items():
-                    if key.startswith("fsdp_") and key != "fsdp_version":
-                        update_fsdp_config[key.replace("fsdp_", "")] = value
-                    else:
-                        update_fsdp_config[key] = value
-                data["fsdp_config"] = update_fsdp_config
-        return data
-
     @model_validator(mode="after")
     def check_fsdp_offload_w_8bit_optimizer(self):
         if (
@@ -975,6 +948,40 @@ class OptimizationValidationMixin:
 
         return data
 
+    @model_validator(mode="before")
+    @classmethod
+    def check_fsdp_version_in_fsdp_config(cls, data):
+        fsdp_config = data.get("fsdp_config") or {}
+        if fsdp_config and fsdp_config.get("fsdp_version"):
+            LOG.warning(
+                "Configuring `fsdp_version` in `fsdp_config` is deprecated. "
+                "Please configure `fsdp_version` as a top-level field."
+            )
+            data["fsdp_version"] = fsdp_config.pop("fsdp_version")
+        return data
+
+    @model_validator(mode="before")
+    @classmethod
+    def check_fsdp_config_kwargs_prefix(cls, data):
+        if fsdp_config := data.get("fsdp_config"):
+            should_fix = False
+            for key, _ in fsdp_config.items():
+                if key.startswith("fsdp_"):
+                    should_fix = True
+                    LOG.warning_once(
+                        "Configuring FSDP fields with the `fsdp_` prefix is deprecated. "
+                        "Please omit the `fsdp_` prefix from the any fields in `fsdp_config`."
+                    )
+            if should_fix:
+                update_fsdp_config = {}
+                for key, value in fsdp_config.items():
+                    if key.startswith("fsdp_") and key != "fsdp_version":
+                        update_fsdp_config[key.replace("fsdp_", "")] = value
+                    else:
+                        update_fsdp_config[key] = value
+                data["fsdp_config"] = update_fsdp_config
+        return data
+
 
 class SystemValidationMixin:
     """Validation methods related to system and hardware configuration."""

src/axolotl/utils/trackio_.py

@@ -0,0 +1,17 @@
+"""Module for trackio utilities"""
+
+import os
+
+from axolotl.utils.dict import DictDefault
+
+
+def setup_trackio_env_vars(cfg: DictDefault):
+    for key in cfg.keys():
+        if key.startswith("trackio_"):
+            value = cfg.get(key, "")
+
+            if value and isinstance(value, str) and len(value) > 0:
+                os.environ[key.upper()] = value
+
+    if cfg.trackio_project_name and len(cfg.trackio_project_name) > 0:
+        cfg.use_trackio = True

src/axolotl/utils/trainer.py

@@ -201,33 +201,19 @@ def add_pose_position_ids(
 
 
 def add_length(sample):
-    """
-    Set the "length" field on a sample to the number of input tokens.
-    
-    Parameters:
-        sample (Mapping-like): A sample containing an "input_ids" sequence.
-    
-    Returns:
-        sample (dict-like): The same sample with "length" set to len(sample["input_ids"]).
-    """
     sample["length"] = len(sample["input_ids"])
     return sample
 
 
 def drop_long_seq(sample, sequence_len=2048, min_sequence_len=2, raise_on_drop=False):
     """
-    Return whether a sample (single or batched) should be kept based on sequence length constraints.
-    
-    Determines if each sequence's length falls within [min_sequence_len, sequence_len]. Supports a single example (list[int]) or a batch (list[list[int]]). If the sample's "input_ids" is empty, the sample is treated as dropped. When raise_on_drop is True, encountering any sequence longer than sequence_len raises a ValueError.
-    
-    Parameters:
-        sample (dict): A mapping containing "input_ids" with either a single sequence or a batch of sequences.
-        sequence_len (int): Maximum allowed sequence length (inclusive).
-        min_sequence_len (int): Minimum allowed sequence length (inclusive).
-        raise_on_drop (bool): If True, raise ValueError when a sequence exceeds sequence_len.
-    
-    Returns:
-        bool or list[bool]: For a single example, returns True if its length is within the bounds, False otherwise. For a batch, returns a list of booleans indicating which sequences should be kept.
+    Drop samples whose sequence length is either too long (> sequence_len)
+    or too short (< min_sequence_len).
+
+    Works for both single-example (list[int]) or batched (list[list[int]]).
+
+    If raise_on_drop is set, the code raises a ValueError if a sample is
+    encountered that is too long and would have been dropped.
     """
     min_sequence_len = min_sequence_len or 2
 
@@ -740,4 +726,4 @@ def setup_trainer(
     trainer_builder.train_dataset = train_dataset
     trainer_builder.eval_dataset = eval_dataset
 
-    return trainer_builder.build(total_num_steps)
+    return trainer_builder.build(total_num_steps)

tests/core/test_builders.py

@@ -474,10 +474,8 @@ def rand_reward_func(prompts, completions) -> list[float]:
 
             assert trainer.optimizer_cls_and_kwargs is not None
 
-            from axolotl.contribs.mit.muon import (
-                Muon,
-                MuonOptimizerFactory,
-            )
+            from axolotl.contribs.mit.muon import MuonOptimizerFactory
+            from axolotl.contribs.mit.muon.muon import Muon
 
             optimizer_cls, optimizer_kwargs = trainer.optimizer_cls_and_kwargs
             assert optimizer_cls is MuonOptimizerFactory
@@ -556,10 +554,8 @@ class TestHFCausalTrainerBuilder:
 
         assert trainer.optimizer_cls_and_kwargs is not None
 
-        from axolotl.contribs.mit.muon import (
-            Muon,
-            MuonOptimizerFactory,
-        )
+        from axolotl.contribs.mit.muon import MuonOptimizerFactory
+        from axolotl.contribs.mit.muon.muon import Muon
 
         optimizer_cls, optimizer_kwargs = trainer.optimizer_cls_and_kwargs
         assert optimizer_cls is MuonOptimizerFactory

tests/e2e/multigpu/test_dist_muon_fsdp2.py

@@ -0,0 +1,168 @@
+"""Test module for DistMuon optimizer with FSDP2 multi-GPU functionality."""
+
+import os
+from pathlib import Path
+
+import torch
+import yaml
+from accelerate.test_utils import execute_subprocess_async
+from tbparse import SummaryReader
+from transformers.testing_utils import get_torch_dist_unique_port
+
+from axolotl.utils.dict import DictDefault
+
+from tests.e2e.utils import most_recent_subdir, require_torch_2_7_0
+
+AXOLOTL_ROOT = Path(__file__).parent.parent.parent.parent
+
+
+def verify_training_success(temp_dir):
+    """Verify that training completed successfully by checking artifacts and loss."""
+    output_path = Path(temp_dir)
+
+    model_files = list(output_path.glob("*.bin")) + list(
+        output_path.glob("*.safetensors")
+    )
+    assert len(model_files) > 0, "No model files found - training may have failed"
+
+    checkpoint_files = list(output_path.glob("checkpoint-*"))
+    assert len(checkpoint_files) > 0, (
+        "No checkpoint files found - training may have failed"
+    )
+
+    tb_log_path = most_recent_subdir(temp_dir + "/runs")
+    if tb_log_path:
+        event_files = sorted(os.listdir(tb_log_path))
+        if event_files:
+            event_file = os.path.join(tb_log_path, event_files[0])
+            reader = SummaryReader(event_file)
+            df = reader.scalars
+            train_loss_df = df[df.tag == "train/train_loss"]
+            if len(train_loss_df) > 0:
+                final_loss = train_loss_df.value.values[-1]
+                assert not torch.isnan(torch.tensor(final_loss)), (
+                    f"Training loss is NaN: {final_loss}"
+                )
+
+
+class TestDistMuon:
+    """Test class for DistMuon optimizer with FSDP2 functionality."""
+
+    @require_torch_2_7_0
+    def test_fft_sft(self, temp_dir):
+        cfg = DictDefault(
+            {
+                "base_model": "Qwen/Qwen2.5-0.5B",
+                "sequence_len": 2048,
+                "val_set_size": 0.01,
+                "datasets": [
+                    {
+                        "path": "tatsu-lab/alpaca",
+                        "type": "alpaca",
+                        "split": "train[:10%]",
+                    },
+                ],
+                "num_epochs": 1,
+                "max_steps": 2,
+                "micro_batch_size": 2,
+                "gradient_accumulation_steps": 1,
+                "output_dir": temp_dir,
+                "learning_rate": 0.02,
+                "optimizer": "muon",
+                "weight_decay": 0.01,
+                "lr_scheduler": "cosine",
+                "flash_attention": True,
+                "fsdp_version": 2,
+                "fsdp_config": {
+                    "offload_params": False,
+                    "cpu_ram_efficient_loading": False,
+                    "transformer_layer_cls_to_wrap": "Qwen2DecoderLayer",
+                    "state_dict_type": "FULL_STATE_DICT",
+                    "auto_wrap_policy": "TRANSFORMER_BASED_WRAP",
+                    "reshard_after_forward": True,
+                },
+                "use_tensorboard": True,
+                "bf16": True,
+            }
+        )
+
+        # write cfg to yaml file
+        Path(temp_dir).mkdir(parents=True, exist_ok=True)
+        with open(Path(temp_dir) / "config.yaml", "w", encoding="utf-8") as fout:
+            fout.write(yaml.dump(cfg.to_dict(), Dumper=yaml.Dumper))
+
+        execute_subprocess_async(
+            [
+                "axolotl",
+                "train",
+                str(Path(temp_dir) / "config.yaml"),
+                "--num-processes",
+                "2",
+                "--main-process-port",
+                f"{get_torch_dist_unique_port()}",
+            ]
+        )
+
+        verify_training_success(temp_dir)
+
+    @require_torch_2_7_0
+    def test_lora_sft(self, temp_dir):
+        cfg = DictDefault(
+            {
+                "base_model": "Qwen/Qwen2.5-0.5B",
+                "sequence_len": 2048,
+                "val_set_size": 0.01,
+                "datasets": [
+                    {
+                        "path": "tatsu-lab/alpaca",
+                        "type": "alpaca",
+                        "split": "train[:10%]",
+                    },
+                ],
+                "adapter": "lora",
+                "lora_r": 8,
+                "lora_alpha": 16,
+                "lora_dropout": 0.05,
+                "lora_target_linear": True,
+                "num_epochs": 1,
+                "max_steps": 2,
+                "micro_batch_size": 2,
+                "gradient_accumulation_steps": 1,
+                "output_dir": temp_dir,
+                "learning_rate": 0.02,
+                "optimizer": "muon",
+                "weight_decay": 0.01,
+                "lr_scheduler": "cosine",
+                "flash_attention": True,
+                "fsdp_version": 2,
+                "fsdp_config": {
+                    "offload_params": False,
+                    "cpu_ram_efficient_loading": False,
+                    "transformer_layer_cls_to_wrap": "Qwen2DecoderLayer",
+                    "state_dict_type": "FULL_STATE_DICT",
+                    "auto_wrap_policy": "TRANSFORMER_BASED_WRAP",
+                    "reshard_after_forward": True,
+                },
+                "use_tensorboard": True,
+                "bf16": True,
+            }
+        )
+
+        # write cfg to yaml file
+        Path(temp_dir).mkdir(parents=True, exist_ok=True)
+        with open(Path(temp_dir) / "config.yaml", "w", encoding="utf-8") as fout:
+            fout.write(yaml.dump(cfg.to_dict(), Dumper=yaml.Dumper))
+
+        execute_subprocess_async(
+            [
+                "axolotl",
+                "train",
+                str(Path(temp_dir) / "config.yaml"),
+                "--num-processes",
+                "2",
+                "--main-process-port",
+                f"{get_torch_dist_unique_port()}",
+            ]
+        )
+
+        verify_training_success(temp_dir)

tests/test_data.py

@@ -7,6 +7,7 @@ import unittest
 from transformers import LlamaTokenizer
 
 from axolotl.utils.data import encode_streaming, md5
+from axolotl.utils.trainer import drop_long_seq
 
 from tests.hf_offline_utils import enable_hf_offline
 
@@ -63,6 +64,42 @@ class TestEncodePretraining(unittest.TestCase):
             md5("hello world", "utf-8"), "5eb63bbbe01eeed093cb22bb8f5acdc3"
         )
 
+    def test_excess_length_strategy(self):
+        """Test that excess_length_strategy results in a value error when set to 'raise'."""
+
+        # -- single sequence --
+        # This should work
+        data = {"input_ids": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]}
+        drop_long_seq(data, 32, raise_on_drop=True)
+
+        # This should return True, since data fits
+        dropped = drop_long_seq(data, 32)
+        self.assertTrue(dropped)
+
+        # This should raise
+        self.assertRaises(ValueError, drop_long_seq, data, 15, raise_on_drop=True)
+
+        # This should return False, since data doesn't fit
+        dropped = drop_long_seq(data, 15)
+        self.assertFalse(dropped)
+
+        # -- batch sequence --
+        # This should work
+        data = {
+            "input_ids": [
+                [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15],
+                [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16],
+            ]
+        }
+        drop_long_seq(data, 32, raise_on_drop=True)
+
+        # This should raise
+        self.assertRaises(ValueError, drop_long_seq, data, 15, raise_on_drop=True)
+
+        # This should keep the first but drop the second entry
+        dropped = drop_long_seq(data, 15)
+        self.assertEqual(dropped, [True, False])
+
 
 if __name__ == "__main__":
     unittest.main()

tests/test_datasets.py

@@ -13,7 +13,9 @@ from transformers import PreTrainedTokenizer
 
 from axolotl.loaders.tokenizer import load_tokenizer
 from axolotl.utils.data.rl import prepare_preference_datasets
-from axolotl.utils.data.sft import _load_tokenized_prepared_datasets
+from axolotl.utils.data.sft import (
+    _load_tokenized_prepared_datasets,
+)
 from axolotl.utils.dict import DictDefault
 
 from tests.constants import (

tests/test_validation_dataset.py

@@ -363,5 +363,5 @@ class TestOptimizerValidation(BaseValidation):
             }
         )
 
-        with pytest.raises(ValueError, match=r".*is currently incompatible with*"):
+        with pytest.raises(ValueError, match=r".*only compatible with FSDP2.*"):
             validate_config(cfg)

tests/utils/schemas/validation/test_fsdp.py

@@ -123,6 +123,17 @@ class TestFSDPValidation:
         assert cfg.fsdp_config.transformer_layer_cls_to_wrap == "LlamaDecoderLayer"
         assert cfg.fsdp_config.reshard_after_forward is True
 
+    def test_muon_fsdp1_rejected(self, min_base_cfg):
+        cfg = min_base_cfg | DictDefault(
+            optimizer="muon",
+            fsdp_version=1,
+            fsdp_config={"reshard_after_forward": True},
+        )
+        with pytest.raises(
+            ValueError, match="Muon optimizer is only compatible with FSDP2"
+        ):
+            validate_config(cfg)
+
     @pytest.mark.parametrize(
         "rl",
         [