ot specified, the callback is called at
every step.   Returns 
StableDiffusionPipelineOutput or tuple
  
If return_dict is True, StableDiffusionPipelineOutput is returned,
otherwise a tuple is returned where the first element is a list with the generated images.
  The call function to the pipeline for generation.  Examples:   Copied >>> from diffusers import StableDiffusionLatentUpscalePipeline, StableDiffusionPipeline
>>> import torch


>>> pi