Edward Zion Saji 55a7950e3d fix: DPO tool role KeyError (#3217), dataset hash output_dir (#3303), config validators (#3538) [skip ci] ...

* fix: DPO tool role KeyError, dataset hash output_dir, config validators [skip-e2e]

- Add 'tool' to default role_map_inv in dpo/chat_template.py default() and
  argilla_chat() so datasets with tool-call messages no longer raise
  KeyError: 'tool' (closes #3217)

- Fix generate_dataset_hash_from_config to use canonical tokenizer config +
  overrides content instead of tokenizer.name_or_path when added_tokens_overrides
  is set, preventing cache busting when only output_dir changes (closes #3303)

- Add three Pydantic config validators to AxolotlConfigWCapabilities:
  * save_strategy: 'best' requires metric_for_best_model
  * streaming=True is incompatible with val_set_size > 0
  * lora_target_modules list entries must be valid Python regex patterns

- Tests for all three changes

* review: condense comment in shared.py, swap Mistral model for SmolLM2-135M in test_hash

* chore: lint

* move the validators out of the w/ capabilities schema

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Co-authored-by: Wing Lian <wing@axolotl.ai>

2026-04-01 19:57:07 -04:00

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