al — (torch.Tensor, optional):
A tensor that if specified is added to the residual of the middle unet block.   return_dict (bool, optional, defaults to True) —
Whether or not to return a ~models.unet_3d_condition.UNet3DConditionOutput instead of a plain
tuple.   cross_attention_kwargs (dict, optional) —
A kwargs dictionary that if specified is passed along to the AttnProcessor.   Returns 
~models.unet_3d_condition.UNet3DConditionOutput or tuple