Files
axolotl/examples/swanlab/dpo-swanlab-completions.yml
Wing Lian e4032fc90f Refactor separate attention flags with attn_implementation and capability/concerns feature flags (#3602)
* upgrade to torchao 0.17.0

* chore: lint

* refactor attention handling

* replace legacy attention boolean flags with capability properties

Replace checks with capability-based properties derived from attn_implementation

This separates three concerns that were conflated under flash_attention:
1. Backend selection -> attn_implementation enum
2. Packing capability -> attn_supports_packing property
3. Flash-attn library dependency -> attn_uses_flash_lib property

* compute attn capability flags in normalizer instead of properties

* make attn_implementation the single source of truth

* move attention-dependent validators to mode=after

* migrate remaining consumers to canonical attn_implementation

* expand attention tests + rewrite docs

* migrate example configs to canonical attn_implementation

* update doc snippets + reject gemma4-hybrid with non-FA2 backend

* remove dead gemma4 branch in _set_attention_config

* fix duplicate attn_implementation in gpt-oss yamls and flaky caplog tests

* drop "Phase 2" naming from attn-implementation tests

* regroup attn_implementation tests by feature concern

* clean up verbose comments and remove MD

Signed-off-by: Wing Lian <wing@axolotl.ai>
Co-authored-by: Axolotl Swarm <no-reply@axolotl.ai>

* fix(collator): pass return_dict=True at apply_chat_template top level for transformers 5.x

In transformers 5.x, ProcessorMixin.apply_chat_template gained its own
`return_dict` parameter (defaulting to False).  When return_dict=False
and tokenize=True the method returns out["input_ids"] directly — a 2-D
tensor — rather than the full BatchFeature dict.

The old code placed `return_dict=True` inside processor_kwargs.  In
transformers 5.x those kwargs are forwarded to the underlying processor
call self(...) where _merge_kwargs silently ignores any key not present
in MllamaProcessorKwargs (emitting a warning).  The outer return_dict
therefore stayed False, apply_chat_template returned the raw input_ids
tensor, and the subsequent `batch["input_ids"]` attempted to index a
2-D tensor with the 9-character string "input_ids", producing:

  IndexError: too many indices for tensor of dimension 2

The fix is to pass return_dict=True as a top-level keyword argument to
apply_chat_template (where it is actually consumed) and remove it from
processor_kwargs (where it was silently dropped).  No version guard is
needed: transformers is pinned to ==5.5.4 in pyproject.toml.

Adds a unit-level regression test (tests/test_mm_chat_collator.py) that
mocks the processor to return a raw tensor when apply_chat_template is
called without top-level return_dict=True, verifying the four invariants:
process_rows returns a dict, input_ids is 2-D, labels is 2-D, and
apply_chat_template receives return_dict=True as a top-level kwarg.

Fixes: tests/e2e/test_llama_vision.py::TestLlamaVision::test_lora_llama_vision_multimodal_dataset
Fixes: tests/e2e/test_llama_vision.py::TestLlamaVision::test_lora_llama_vision_text_only_dataset
Signed-off-by: Wing Lian <wing@axolotl.ai>
Co-authored-by: Axolotl Swarm <no-reply@axolotl.ai>

* fix(collator): process_rows returns dict (BatchFeature) shape

Two related changes for the multimodal chat collator under transformers 5.x:

1. Wrap apply_chat_template result in dict(...) so process_rows returns
   a plain dict rather than a BatchFeature instance. BatchFeature is a
   Mapping but not a dict; downstream code that did
     batch["labels"] = self.processing_strategy.process_labels(batch["input_ids"])
   would index on a tensor when the result wasn't dict-shaped, raising
     IndexError: too many indices for tensor of dimension 2

2. Soften the regression test's contract from `dict` to `Mapping` so it
   exercises the actual semantic guarantee (key/value access) rather
   than the implementation detail (dict vs BatchFeature). Test guards
   against the original transformers 5.x breakage where apply_chat_template's
   return_dict default went from True to False.

Includes regression test under tests/test_mm_chat_collator.py.

Bug surfaced via swarm dispatch task_01KQHPNAYD8XARSNSDJVW1GPF6 against
attn-implementation-refactor; squash-merged from agent commits 4de886fd
+ dc9fcf4f.

Signed-off-by: Wing Lian <wing@axolotl.ai>

---------

Signed-off-by: Wing Lian <wing@axolotl.ai>
Co-authored-by: Axolotl Swarm <no-reply@axolotl.ai>
2026-05-05 10:15:18 -04:00

169 lines
4.7 KiB
YAML

# SwanLab DPO Training Example with Completion Logging
#
# This example demonstrates DPO (Direct Preference Optimization) training
# with SwanLab integration for experiment tracking and completion table logging.
#
# Features enabled:
# - SwanLab experiment tracking
# - RLHF completion table logging (prompts, chosen/rejected responses, rewards)
# - Lark (Feishu) team notifications (optional)
#
# To run:
# export SWANLAB_API_KEY=your-api-key
# accelerate launch -m axolotl.cli.train examples/swanlab/dpo-swanlab-completions.yml
# Model Configuration
base_model: meta-llama/Meta-Llama-3-8B-Instruct
model_type: LlamaForCausalLM
tokenizer_type: AutoTokenizer
special_tokens:
pad_token: <|finetune_right_pad_id|>
eos_token: <|eot_id|>
# Quantization
load_in_8bit: true
load_in_4bit: false
# LoRA Configuration
adapter: lora
lora_r: 32
lora_alpha: 16
lora_dropout: 0.05
lora_target_linear: true
# DPO Configuration
chat_template: llama3
rl: dpo
datasets:
- path: fozziethebeat/alpaca_messages_2k_dpo_test
type: chat_template.default
field_messages: conversation
field_chosen: chosen
field_rejected: rejected
message_property_mappings:
role: role
content: content
roles:
system:
- system
user:
- user
assistant:
- assistant
# Dataset and Output
dataset_prepared_path:
val_set_size: 0.05
output_dir: ./outputs/dpo-swanlab-out
# Training Configuration
sequence_len: 4096
sample_packing: false
micro_batch_size: 2
gradient_accumulation_steps: 4
num_epochs: 4
# Optimization
optimizer: adamw_bnb_8bit
lr_scheduler: cosine
learning_rate: 0.0002
warmup_ratio: 0.1
weight_decay: 0.0
# Precision
bf16: auto
tf32: false
# Performance
gradient_checkpointing: true
attn_implementation: flash_attention_2
# Checkpointing and Logging
logging_steps: 1
evals_per_epoch: 4
saves_per_epoch: 1
# ============================================================================
# SwanLab Integration
# ============================================================================
plugins:
- axolotl.integrations.swanlab.SwanLabPlugin
# Basic SwanLab Configuration
use_swanlab: true
swanlab_project: dpo-training
swanlab_experiment_name: llama-3-dpo-completions-demo
swanlab_description: "DPO training with completion table logging"
swanlab_mode: cloud # Options: cloud, local, offline, disabled
# SwanLab Authentication
# Recommended: Set via environment variable
# export SWANLAB_API_KEY=your-api-key
# Or set in config (less secure):
# swanlab_api_key: your-api-key
# Optional: Team workspace
# swanlab_workspace: my-research-team
# ============================================================================
# RLHF Completion Table Logging
# ============================================================================
#
# Automatically logs model completions to SwanLab for qualitative analysis:
# - Prompts from your DPO dataset
# - Chosen responses (preferred)
# - Rejected responses (non-preferred)
# - Reward differences
#
# View the table in SwanLab dashboard under "rlhf_completions"
swanlab_log_completions: true
swanlab_completion_log_interval: 100 # Log every 100 training steps
swanlab_completion_max_buffer: 128 # Keep last 128 completions in memory
# Memory Usage Notes:
# - Buffer size 128: ~64 KB (default, recommended)
# - Buffer size 512: ~256 KB (for more historical completions)
# - Buffer size 1024: ~512 KB (maximum for very long training runs)
# Performance Notes:
# - Completion logging overhead: < 0.5% per training step
# - Only logs every N steps to minimize impact
# - Memory-bounded buffer prevents memory leaks
# ============================================================================
# Optional: Lark (Feishu) Team Notifications
# ============================================================================
#
# Get real-time training notifications in your team chat
# Uncomment to enable:
# swanlab_lark_webhook_url: https://open.feishu.cn/open-apis/bot/v2/hook/xxxxxxxxxx
# swanlab_lark_secret: your-webhook-secret # Recommended for production
# Notifications sent for:
# - Training start
# - Training completion
# - Training errors
# - Metric milestones (if configured)
# ============================================================================
# Optional: Private SwanLab Deployment
# ============================================================================
#
# For enterprise users with private SwanLab deployment:
# swanlab_web_host: https://swanlab.yourcompany.com
# swanlab_api_host: https://api.swanlab.yourcompany.com
# ============================================================================
# Disable WandB if you're migrating from it
# ============================================================================
# wandb_project:
# wandb_entity:
# use_wandb: false