def METHOD_NAME():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--lang_dir",
        type=str,
        help="""Lang directory.
        """,
    )
    parser.add_argument(
        "--graph_dir",
        type=str,
        help="""Graph directory.
        """,
    )
    parser.add_argument(
        "--ngram_num",
        type=int,
        default=4,
        help="""Max order in language model.
        """,
    )
    return parser.parse_args()