Function hf_tokenizer

training/verl/utils/tokenizer.py:35–58

Create a huggingface pretrained tokenizer. Args: name (str): The name of the tokenizer. correct_pad_token (bool): Whether to correct the pad token id. correct_gemma2 (bool): Whether to correct the gemma2 tokenizer. **kwargs: The keyword arguments for the tokenize

(name_or_path, correct_pad_token=True, correct_gemma2=True, **kwargs)

def hf_tokenizer(name_or_path, correct_pad_token=True, correct_gemma2=True, **kwargs):
    """Create a huggingface pretrained tokenizer.

    Args:
        name (str): The name of the tokenizer.
        correct_pad_token (bool): Whether to correct the pad token id.
        correct_gemma2 (bool): Whether to correct the gemma2 tokenizer.
        **kwargs: The keyword arguments for the tokenizer.

    Returns:
        transformers.PreTrainedTokenizer: The pretrained tokenizer.

    """
    from transformers import AutoTokenizer
    if correct_gemma2 and isinstance(name_or_path, str) and 'gemma-2-2b-it' in name_or_path:
        # the EOS token in gemma2 is ambiguious, which may worsen RL performance.
        # https://huggingface.co/google/gemma-2-2b-it/commit/17a01657f5c87135bcdd0ec7abb4b2dece04408a
        warnings.warn('Found gemma-2-2b-it tokenizer. Set eos_token and eos_token_id to <end_of_turn> and 107.')
        kwargs['eos_token'] = '<end_of_turn>'
        kwargs['eos_token_id'] = 107
    tokenizer = AutoTokenizer.from_pretrained(name_or_path, **kwargs)
    if correct_pad_token:
        set_pad_token_id(tokenizer)
    return tokenizer