def METHOD_NAME(
    cls, parser: ParlaiParser, partial_opt: Optional[Opt] = None
) -> ParlaiParser:
    super().METHOD_NAME(parser, partial_opt=partial_opt)
    agent = parser.add_argument_group('MyCustom Transformer Arguments')
    parser.add_argument(
        '--decoder-ffn-variants',
        type=DecoderFeedForwardVariant,
        default=DecoderFeedForwardVariant.ONE,
        help='Some variants in the decoder FFN implementation',
    )
    return agent  # type: ignore