How to use the reader.DataReader.load_dict function in reader

args.sort_type = reader.SortType.NONE
    args.shuffle = False
    args.shuffle_batch = False
    test_data = prepare_data_generator(
        args,
        is_test=False,
        count=dev_count,
        pyreader=pyreader,
        py_reader_provider_wrapper=py_reader_provider_wrapper,
        place=place)
    if args.use_py_reader:
        pyreader.start()
        data_generator = None
    else:
        data_generator = test_data()
    trg_idx2word = reader.DataReader.load_dict(
        dict_path=args.trg_vocab_fpath, reverse=True)

    while True:
        try:
            feed_dict_list = prepare_feed_dict_list(data_generator, dev_count,
                                                    place)
            if args.use_parallel_exe:
                seq_ids, seq_scores = infer_exe.run(
                    fetch_list=[out_ids.name, out_scores.name],
                    feed=feed_dict_list,
                    return_numpy=False)
            else:
                seq_ids, seq_scores = exe.run(
                    program=infer_program,
                    fetch_list=[out_ids.name, out_scores.name],
                    feed=feed_dict_list[0]

default=True,
        help="The flag indicating whether to use py_reader.")
    parser.add_argument(
        "--use_parallel_exe",
        type=ast.literal_eval,
        default=False,
        help="The flag indicating whether to use ParallelExecutor.")
    parser.add_argument(
        'opts',
        help='See config.py for all options',
        default=None,
        nargs=argparse.REMAINDER)
    args = parser.parse_args()
    # Append args related to dict
    src_dict = reader.DataReader.load_dict(args.src_vocab_fpath)
    trg_dict = reader.DataReader.load_dict(args.trg_vocab_fpath)
    dict_args = [
        "src_vocab_size", str(len(src_dict)), "trg_vocab_size",
        str(len(trg_dict)), "bos_idx", str(src_dict[args.special_token[0]]),
        "eos_idx", str(src_dict[args.special_token[1]]), "unk_idx",
        str(src_dict[args.special_token[2]])
    ]
    merge_cfg_from_list(args.opts + dict_args,
                        [InferTaskConfig, ModelHyperParams])
    return args

default=False,
        help="The flag indicating whether to use ParallelExecutor.")
    parser.add_argument(
        "--profile_ops",
        type=ast.literal_eval,
        default=True,
        help="The flag indicating whether to profile operators.")
    parser.add_argument(
        'opts',
        help='See config.py for all options',
        default=None,
        nargs=argparse.REMAINDER)

    args = parser.parse_args()
    # Append args related to dict
    src_dict = reader.DataReader.load_dict(args.src_vocab_fpath)
    trg_dict = reader.DataReader.load_dict(args.trg_vocab_fpath)
    dict_args = [
        "src_vocab_size", str(len(src_dict)), "trg_vocab_size",
        str(len(trg_dict)), "bos_idx", str(src_dict[args.special_token[0]]),
        "eos_idx", str(src_dict[args.special_token[1]]), "unk_idx",
        str(src_dict[args.special_token[2]])
    ]
    merge_cfg_from_list(args.opts + dict_args,
                        [TrainTaskConfig, ModelHyperParams])
    return args

"for continuous evaluation.")
    parser.add_argument(
        "--use_py_reader",
        type=ast.literal_eval,
        default=True,
        help="The flag indicating whether to use py_reader.")
    parser.add_argument(
        "--fetch_steps",
        type=int,
        default=100,
        help="The frequency to fetch and print output.")

    args = parser.parse_args()
    # Append args related to dict
    src_dict = reader.DataReader.load_dict(args.src_vocab_fpath)
    trg_dict = reader.DataReader.load_dict(args.trg_vocab_fpath)
    dict_args = [
        "src_vocab_size", str(len(src_dict)), "trg_vocab_size",
        str(len(trg_dict)), "bos_idx", str(src_dict[args.special_token[0]]),
        "eos_idx", str(src_dict[args.special_token[1]]), "unk_idx",
        str(src_dict[args.special_token[2]])
    ]
    merge_cfg_from_list(args.opts + dict_args,
                        [TrainTaskConfig, ModelHyperParams])
    return args

type=ast.literal_eval,
        default=True,
        help="The flag indicating whether to use py_reader.")
    parser.add_argument(
        "--use_parallel_exe",
        type=ast.literal_eval,
        default=False,
        help="The flag indicating whether to use ParallelExecutor.")
    parser.add_argument(
        'opts',
        help='See config.py for all options',
        default=None,
        nargs=argparse.REMAINDER)
    args = parser.parse_args()
    # Append args related to dict
    src_dict = reader.DataReader.load_dict(args.src_vocab_fpath)
    trg_dict = reader.DataReader.load_dict(args.trg_vocab_fpath)
    dict_args = [
        "src_vocab_size", str(len(src_dict)), "trg_vocab_size",
        str(len(trg_dict)), "bos_idx", str(src_dict[args.special_token[0]]),
        "eos_idx", str(src_dict[args.special_token[1]]), "unk_idx",
        str(src_dict[args.special_token[2]])
    ]
    merge_cfg_from_list(args.opts + dict_args,
                        [InferTaskConfig, ModelHyperParams])
    return args

help="The flag indicating whether to use ParallelExecutor.")
    parser.add_argument(
        "--profile_ops",
        type=ast.literal_eval,
        default=True,
        help="The flag indicating whether to profile operators.")
    parser.add_argument(
        'opts',
        help='See config.py for all options',
        default=None,
        nargs=argparse.REMAINDER)

    args = parser.parse_args()
    # Append args related to dict
    src_dict = reader.DataReader.load_dict(args.src_vocab_fpath)
    trg_dict = reader.DataReader.load_dict(args.trg_vocab_fpath)
    dict_args = [
        "src_vocab_size", str(len(src_dict)), "trg_vocab_size",
        str(len(trg_dict)), "bos_idx", str(src_dict[args.special_token[0]]),
        "eos_idx", str(src_dict[args.special_token[1]]), "unk_idx",
        str(src_dict[args.special_token[2]])
    ]
    merge_cfg_from_list(args.opts + dict_args,
                        [TrainTaskConfig, ModelHyperParams])
    return args