          FreeInit is not really free - the improved quality comes at the cost of extra computation. It requires sampling a few extra times depending on the num_iters parameter that is set when enabling it. Setting the use_fast_sampling parameter to True can improve the overall performance (at the cost of lower quality compared to when use_fast_sampling=False but still better results than vanilla video generation models).  PIAPipeline  class diffusers.PIAPipeline  < source > ( vae: AutoencoderKL text_encoder: CLIPTextModel tokenizer: CLIPTokenizer unet: Union scheduler: Union motion_adapter: Optional = None feature_extractor: CLIPImageProcessor = None image_encoder: CLIPVisionModelWithProjection = None  )   Parameters   vae (AutoencoderKL) —