    def add_args(parser):
        """Add task-specific arguments to the parser."""
        parser.add_argument(
            "data",
            help="colon separated path to data directories list, \
                            will be iterated upon during epochs in round-robin manner",
        )
        parser.add_argument(
            "--tokens-per-sample",
            default=512,
            type=int,
            help="max number of total tokens over all segments" " per sample",
        )
        parser.add_argument(
            "--monolingual-langs",
            default="en",
            type=str,
            help="comma separated list of languages for which we"
            " want to train XLM on",
        )
        parser.add_argument(
            "--shuffle",
            action="store_true",
            help="shuffle each monolingual dataset while" " training",
        )
Add task-specific arguments to the parser.
fairseq/tasks/cross_lingual_lm.py