def METHOD_NAME(
    self, prev_output_tokens, encoder_out=None, incremental_state=None, **kwargs
):
    """
    Args:
        prev_output_tokens (LongTensor): shifted output tokens of shape
            `(batch, tgt_len)`, for teacher forcing
        encoder_out (dict, optional): output from the encoder, used for
            encoder-side attention
        incremental_state (dict, optional): dictionary used for storing
            state during :ref:`Incremental decoding`
    Returns:
        tuple:
            - the decoder's output of shape `(batch, tgt_len, vocab)`
            - a dictionary with any model-specific outputs
    """
    raise NotImplementedError