def get_train_fns(self) -> Tuple[List[str], List[str]]:
        """ Fetches the training set of the corpus.

        Outputs a Tuple of size 2, where the first element is a list of paths
        to input features files, one per utterance. The second element is a list
        of paths to the transcriptions.
        """
        return self.prefixes_to_fns(self.train_prefixes)
Fetches the training set of the corpus.

        Outputs a Tuple of size 2, where the first element is a list of paths
        to input features files, one per utterance. The second element is a list
        of paths to the transcriptions.