ther or not to return a ImagePipelineOutput instead of a plain tuple.   Returns 
ImagePipelineOutput or tuple
    Function invoked when calling the pipeline for generation. Examples:  KandinskyV22PriorEmb2EmbPipeline  class diffusers.KandinskyV22PriorEmb2EmbPipeline  < source > ( prior: PriorTransformer image_encoder: CLIPVisionModelWithProjection text_encoder: CLIPTextModelWithProjection tokenizer: CLIPTokenizer scheduler: UnCLIPScheduler imag