xtuner/utils/stop_criteria.py

# Copyright (c) OpenMMLab. All rights reserved.
from transformers import StoppingCriteria


class StopWordStoppingCriteria(StoppingCriteria):
    """StopWord stopping criteria."""

    def __init__(self, tokenizer, stop_word):
        self.tokenizer = tokenizer
        self.stop_word = stop_word
        self.length = len(self.stop_word)

    def __call__(self, input_ids, *args, **kwargs) -> bool:
        cur_text = self.tokenizer.decode(input_ids[0])
        cur_text = cur_text.replace('\r', '').replace('\n', '')
        return cur_text[-self.length:] == self.stop_word