@staticmethod
def add_cmdline_args(parser):
    """Add command line args specific to this agent."""
    parser = parser.add_argument_group('IrBaseline Arguments')
    parser.add_argument('-lp', '--length_penalty', type=float, default=0.5,
        help='length penalty for responses')
    parser.add_argument('-hsz', '--history_size', type=int, default=1, help
        =
        'number of utterances from the dialogue history to take use as the query'
        )
    parser.add_argument('--label_candidates_file', type=str, default=None,
        help='file of candidate responses to choose from')
