class documentation for the generic methods the
library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)  __call__  < source > ( prompt: Union negative_prompt: Union = None num_images_per_prompt: int = 1 num_inference_steps: int = 25 generator: Union = None latents: Optional = None guidance_scale: float = 4.0 output_type: Optional = 'pt' return_dict: bool = True callback_on_step_end: Optiona