is passed along to the AttentionProcessor as defined in
self.processor.
num_warmup_steps —
number of warmup steps.   Returns 
latents
  
Latents of backward process output at time timesteps[-1].
  Perform backward process given list of time steps.  encode_prompt  < source > ( prompt device num_images_per_prompt do_classifier_free_guidance negative_prompt = None prompt_embeds: Optional = None negative_prompt_embeds: Optional = None lora_scale: O