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[fix] keep DPO preference pair think formatting aligned

pull/829/head
Daoyuan Li 2026-08-29 18:29:00 -07:00
parent e84156818a
commit 56d4cddfd8
1 changed files with 10 additions and 6 deletions
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14
dataset/lm_dataset.py
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@ -28,10 +28,13 @@ def pre_processing_chat(conversations, add_system_ratio=0.2):
return [{'role': 'system', 'content': random.choice(SYSTEM_PROMPTS)}] + conversations
return conversations
def post_processing_chat(prompt_content, empty_think_ratio=0.2):
def post_processing_chat(prompt_content, empty_think_ratio=0.2, remove_empty_think=None):
# 以80%概率移除空思考标签
if '<think>\n\n</think>\n\n' in prompt_content and random.random() > empty_think_ratio:
prompt_content = prompt_content.replace('<think>\n\n</think>\n\n', '')
if '<think>\n\n</think>\n\n' in prompt_content:
if remove_empty_think is None:
remove_empty_think = random.random() > empty_think_ratio
if remove_empty_think:
prompt_content = prompt_content.replace('<think>\n\n</think>\n\n', '')
return prompt_content
class PretrainDataset(Dataset):
@ -139,12 +142,13 @@ class DPODataset(Dataset):
chosen_prompt = self.tokenizer.apply_chat_template(
chosen, tokenize=False, add_generation_prompt=False
)
chosen_prompt = post_processing_chat(chosen_prompt)
rejected_prompt = self.tokenizer.apply_chat_template(
rejected, tokenize=False, add_generation_prompt=False
)
rejected_prompt = post_processing_chat(rejected_prompt)
remove_empty_think = random.random() > 0.2
chosen_prompt = post_processing_chat(chosen_prompt, remove_empty_think=remove_empty_think)
rejected_prompt = post_processing_chat(rejected_prompt, remove_empty_think=remove_empty_think)
chosen_encoding = self.tokenizer(
chosen_prompt, truncation=True, max_length=self.max_length, padding='max_length'
)