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update extract_anthropic_prompt #86

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update extract_anthropic_prompt #86

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11 changes: 7 additions & 4 deletions preference_datasets.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import datasets
import os
import torch
from torch.utils.data import DataLoader, Dataset
from utils import get_local_dir, TemporarilySeededRandom
Expand All @@ -11,12 +12,14 @@
from typing import Dict, List, Optional, Iterator, Callable, Union, Tuple


def extract_anthropic_prompt(prompt_and_response):
def extract_anthropic_prompt(chosen, rejected):
"""Extract the anthropic prompt from a prompt and response pair."""
# Use the longest common prefix between the chosen and rejected as the prompt
common_prefix = os.path.commonprefix([chosen, rejected])
search_term = '\n\nAssistant:'
search_term_idx = prompt_and_response.rfind(search_term)
search_term_idx = common_prefix.rfind(search_term)
assert search_term_idx != -1, f"Prompt and response does not contain '{search_term}'"
return prompt_and_response[:search_term_idx + len(search_term)]
return chosen[:search_term_idx + len(search_term)]


def strip_html_tags(html_string):
Expand Down Expand Up @@ -143,7 +146,7 @@ def get_hh(split: str, silent: bool = False, cache_dir: str = None) -> Dict[str,
print('done')

def split_prompt_and_responses(ex):
prompt = extract_anthropic_prompt(ex['chosen'])
prompt = extract_anthropic_prompt(ex['chosen'], ex['rejected'])
chosen_response = ex['chosen'][len(prompt):]
rejected_response = ex['rejected'][len(prompt):]
return prompt, chosen_response, rejected_response
Expand Down