src/transformers/convert_slow_tokenizer.py/DebertaV2Converter/normalizer
class DebertaV2Converter:    def normalizer(self, proto):
        list_normalizers = []
        if self.original_tokenizer.do_lower_case:
            list_normalizers.append(normalizers.Lowercase())
        list_normalizers.append(normalizers.Strip())

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

        return normalizers.Sequence(list_normalizers)