src/transformers/models/wav2vec2/tokenization_wav2vec2.py/Wav2Vec2Tokenizer/_convert_id_to_token
class Wav2Vec2Tokenizer:    def _convert_id_to_token(self, index: int) -> str:
        """Converts an index (integer) in a token (str) using the vocab."""
        result = self.decoder.get(index, self.unk_token)
        return result