add unipc sampler

app.py

@@ -25,6 +25,7 @@ pipe = StableDiffusionControlNetPipeline.from_pretrained(
         controlnet=cnet,
         torch_dtype=torch.float32,
         )
+pipe.scheduler = UniPCMultistepScheduler.from_config(pipe.scheduler.config)
 
 generator = torch.manual_seed(0)