def add_args(parser):
        """Add criterion-specific arguments to the parser."""
        # fmt: off
        parser.add_argument('--label-smoothing', default=0., type=float, metavar='D',
                            help='epsilon for label smoothing, 0 means no label smoothing')
        # fmt: on
Add criterion-specific arguments to the parser.
infoxlm/fairseq/fairseq/criterions/label_smoothed_cross_entropy.py