>>> pipe.vae.enable_xformers_memory_efficient_attention(attention_op=None)  disable_xformers_memory_efficient_attention  < source > ( )    Disable memory efficient attention from xFormers.  encode_prompt  < source > ( prompt: str prompt_2: Optional = None device: Optional = None num_images_per_prompt: int = 1 do_classifier_free_guidance: bool = True negative_prompt: Optional = None negative_prompt_2: Optional = None prompt_embeds: Optional = None negative_prompt_embeds: Optional = None pooled_prompt_embeds: Optional = None negative_pooled_prompt_embeds: Optional = None lora_scale: Optional = None clip_skip: Optional = None  )   Parameters   prompt (str or List[str], optional) —