src/transformers/models/herbert/tokenization_herbert.py/HerbertTokenizer/__init__
class HerbertTokenizer:    def __init__(
        self,
        vocab_file,
        merges_file,
        tokenizer_file=None,
        cls_token="<s>",
        unk_token="<unk>",
        pad_token="<pad>",
        mask_token="<mask>",
        sep_token="</s>",
        do_lowercase_and_remove_accent=False,
        **kwargs
    ):

        super().__init__(
            vocab_file,
            merges_file,
            tokenizer_file=None,
            cls_token=cls_token,
            unk_token=unk_token,
            pad_token=pad_token,
            mask_token=mask_token,
            sep_token=sep_token,
            do_lowercase_and_remove_accent=do_lowercase_and_remove_accent,
            **kwargs,
        )
        self.bert_pre_tokenizer = BasicTokenizer(
            do_lower_case=False,
            never_split=self.all_special_tokens,
            tokenize_chinese_chars=False,
            strip_accents=False,
        )