much of the previous
momentum is kept. Momentum is built up during warmup for diffusion steps smaller than
sld_warmup_steps.   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