src/transformers/models/marian/tokenization_marian.py/MarianTokenizer/_setup_normalizer
class MarianTokenizer:    def _setup_normalizer(self):
        try:
            from sacremoses import MosesPunctNormalizer

            self.punc_normalizer = MosesPunctNormalizer(self.source_lang).normalize
        except (ImportError, FileNotFoundError):
            warnings.warn("Recommended: pip install sacremoses.")
            self.punc_normalizer = lambda x: x