heckpoints for Sequence Generation Tasks](https://arxiv.org/abs/1907.12461)
    by Sascha Rothe, Shashi Narayan, and Aliaksei Severyn.

    To behave as an decoder the model needs to be initialized with the `is_decoder` argument of the configuration set
    to `True`. To be used in a Seq2Seq model, the model needs to initialized with both `is_decoder` argument and
    `add_cross_attention` set to `True`; an `encoder_hidden_states` is then expected as an input to the forward pass.
    c