irror source to resolve accessibility issues if you’re downloading a model in China. We do not
guarantee the timeliness or safety of the source, and you should refer to the mirror site for more
information.    Load pretrained attention processor layers into UNet2DConditionModel. Attention processor layers have to be
defined in
attention_processor.py
and be a torch.nn.Module class.  Example:   Copied from diffusers import AutoPipelineForText2Ima