def METHOD_NAME():
    """Build lambada dataset."""
    args = get_args()
    tokenizer = get_tokenizer()
    assert len(args.valid_data) == 1
    val_dataset = _LambadaDataset(args.valid_data[0], tokenizer.eod, tokenizer,
                                  args.seq_length, args.strict_lambada)
    print_rank_0(' > found {} samples.'.format(len(val_dataset)))
    return val_dataset