src/transformers/models/roformer/tokenization_roformer_fast.py/RoFormerTokenizerFast/save_pretrained
class RoFormerTokenizerFast:    def save_pretrained(
        self,
        save_directory,
        legacy_format=None,
        filename_prefix=None,
        push_to_hub=False,
        **kwargs,
    ):
        self.backend_tokenizer.pre_tokenizer = BertPreTokenizer()
        return super().save_pretrained(save_directory, legacy_format, filename_prefix, push_to_hub, **kwargs)