def METHOD_NAME(dataset_dir: str):
    data_folder = os.path.join(dataset_dir, "data")
    wav_folder = os.path.join(dataset_dir, "wavs", "speakers")
    os.makedirs(data_folder, exist_ok=True)
    os.makedirs(wav_folder, exist_ok=True)
    mocked_train_samples = _save_samples(dataset_dir, "train", 1)
    mocked_valid_samples = _save_samples(dataset_dir, "valid", 111)
    mocked_test_samples = _save_samples(dataset_dir, "test", 1111)
    return mocked_train_samples, mocked_valid_samples, mocked_test_samples