src/transformers/convert_slow_tokenizer.py/AlbertConverter/normalizer
class AlbertConverter:    def normalizer(self, proto):
        list_normalizers = [
            normalizers.Replace("``", '"'),
            normalizers.Replace("''", '"'),
        ]
        if not self.original_tokenizer.keep_accents:
            list_normalizers.append(normalizers.NFKD())
            list_normalizers.append(normalizers.StripAccents())
        if self.original_tokenizer.do_lower_case:
            list_normalizers.append(normalizers.Lowercase())

        precompiled_charsmap = proto.normalizer_spec.precompiled_charsmap
        list_normalizers.append(normalizers.Precompiled(precompiled_charsmap))
        list_normalizers.append(normalizers.Replace(Regex(" {2,}"), " "))
        return normalizers.Sequence(list_normalizers)