def register_model(name):
    """
    New model types can be added to fairseq with the :func:`register_model`
    function decorator.

    For example::

        @register_model('lstm')
        class LSTM(FairseqEncoderDecoderModel):
            (...)

    .. note:: All models must implement the :class:`BaseFairseqModel` interface.
        Typically you will extend :class:`FairseqEncoderDecoderModel` for
        sequence-to-sequence tasks or :class:`FairseqLanguageModel` for
        language modeling tasks.

    Args:
        name (str): the name of the model
    """

    def register_model_cls(cls):
        if name in MODEL_REGISTRY:
            raise ValueError('Cannot register duplicate model ({})'.format(name))
        if not issubclass(cls, BaseFairseqModel):
            raise ValueError('Model ({}: {}) must extend BaseFairseqModel'.format(name, cls.__name__))
        MODEL_REGISTRY[name] = cls
        return cls

    return register_model_cls

    New model types can be added to fairseq with the :func:`register_model`
    function decorator.

    For example::

        @register_model('lstm')
        class LSTM(FairseqEncoderDecoderModel):
            (...)

    .. note:: All models must implement the :class:`BaseFairseqModel` interface.
        Typically you will extend :class:`FairseqEncoderDecoderModel` for
        sequence-to-sequence tasks or :class:`FairseqLanguageModel` for
        language modeling tasks.

    Args:
        name (str): the name of the model
    
infoxlm/fairseq/fairseq/models/__init__.py