pipeine class.   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 and the
second element is a list of bools indicating whether the corresponding generated image contains
“not-safe-for-work” (nsfw) content.
  The call function to the pipeline for generation.  Examples:   Copied >>> # !pip 