—
A cross-attention mask of shape (batch, sequence_length) is applied to encoder_hidden_states. If
True the mask is kept, otherwise if False it is discarded. Mask will be converted into a bias,
which adds large negative values to the attention scores corresponding to “discard” tokens.   return_dict (bool, optional, defaults to True) —
Whether or not to return a UNet2DConditionOutput instead of a plain
tuple.   cross_attention_kwargs (dict, opti