def METHOD_NAME(
    data_folder, save_json_train, save_json_valid, save_json_test
):
    """
    Prepares the json files for the Mini Librispeech dataset.
    Downloads the dataset if its not found in the `data_folder`.
    Arguments
    ---------
    data_folder : str
        Path to the folder where the Mini Librispeech dataset is stored.
    save_json_train : str
        Path where the train data specification file will be saved.
    save_json_valid : str
        Path where the validation data specification file will be saved.
    save_json_test : str
        Path where the test data specification file will be saved.
    Example
    -------
    >>> data_folder = '/path/to/mini_librispeech'
    >>> prepare_mini_librispeech(data_folder, 'train.json', 'valid.json', 'test.json')
    """
    # Check if this phase is already done (if so, skip it)
    if skip(save_json_train, save_json_valid, save_json_test):
        logger.info("Preparation completed in previous run, skipping.")
        return
    # If the dataset doesn't exist yet, download it
    train_folder = os.path.join(data_folder, "LibriSpeech", "train-clean-5")
    valid_folder = os.path.join(data_folder, "LibriSpeech", "dev-clean-2")
    test_folder = os.path.join(data_folder, "LibriSpeech", "test-clean")
    if not check_folders(train_folder, valid_folder, test_folder):
        download_mini_librispeech(data_folder)
    # List files and create manifest from list
    logger.info(
        f"Creating {save_json_train}, {save_json_valid}, and {save_json_test}"
    )
    extension = [".flac"]
    # List of flac audio files
    wav_list_train = get_all_files(train_folder, match_and=extension)
    wav_list_valid = get_all_files(valid_folder, match_and=extension)
    wav_list_test = get_all_files(test_folder, match_and=extension)
    # List of transcription file
    extension = [".trans.txt"]
    trans_list = get_all_files(data_folder, match_and=extension)
    trans_dict = get_transcription(trans_list)
    # Create the json files
    create_json(wav_list_train, trans_dict, save_json_train)
    create_json(wav_list_valid, trans_dict, save_json_valid)
    create_json(wav_list_test, trans_dict, save_json_test)