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DPO support loss types (#3566)

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* Support loss_type/loss_weights DPO

* Validate dpo loss type/weights only set for dpo

* Tests: Update ipo tests to use new path

* Docs: Update docs for new ipo path

* PR fixes - typo/validation

* PR nit - warning

* chore: fix warnings arg

---------

Co-authored-by: NanoCode012 <nano@axolotl.ai>
This commit is contained in:
Andrew Wu
2026-04-23 05:25:28 +01:00
committed by GitHub
parent 7420fd4de6
commit 90090fa9e8
8 changed files with 117 additions and 5 deletions
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55
tests/e2e/test_dpo.py
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@@ -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",