How to use the nnmnkwii.datasets.jsut.TranscriptionDataSource function in nnmnkwii

@attr("local_only")
def test_ja_jsut():
    f = getattr(frontend, "jp")
    from nnmnkwii.datasets import jsut
    from tqdm import trange
    import jaconv

    d = jsut.TranscriptionDataSource("/home/ryuichi/data/jsut_ver1.1/",
                                     subsets=jsut.available_subsets)
    texts = d.collect_files()

    for p in [0.0, 0.5, 1.0]:
        for idx in trange(len(texts)):
            text = texts[idx]
            seq = f.text_to_sequence(text, p=p)
            assert seq[-1] == eos
            t = f.sequence_to_text(seq)

            if idx < 10:
                print("""{0}: {1}\n{0}: {2}\n""".format(idx, text, t))

def build_from_path(in_dir, out_dir, num_workers=1, tqdm=lambda x: x):
    executor = ProcessPoolExecutor(max_workers=num_workers)
    futures = []

    transcriptions = jsut.TranscriptionDataSource(
        in_dir, subsets=jsut.available_subsets).collect_files()
    wav_paths = jsut.WavFileDataSource(
        in_dir, subsets=jsut.available_subsets).collect_files()

    for index, (text, wav_path) in enumerate(zip(transcriptions, wav_paths)):
        futures.append(executor.submit(
            partial(_process_utterance, out_dir, index + 1, wav_path, text)))
    return [future.result() for future in tqdm(futures)]

def __init__(self, data_root, subsets=["basic5000"], validate=True):
        super(TranscriptionDataSource, self).__init__(
            data_root, subsets, False, validate)