src/transformers/models/speecht5/tokenization_speecht5.py/SpeechT5Tokenizer/_convert_id_to_token
class SpeechT5Tokenizer:    def _convert_id_to_token(self, index):
        """Converts an index (integer) in a token (str) using the vocab."""
        token = self.sp_model.IdToPiece(index)
        return token