Update app.py

app.py

@@ -57,7 +57,7 @@ def main(ref_filepath, prompt, use_nf4, progress=gr.Progress(track_tqdm=True)):
         generator=torch.Generator("cpu").manual_seed(0),
     ).images[0]
     filename = "output_"
-    filename += "_4bit" if four_bit else ""
+    filename += "_4bit" if use_nf4 else ""
     image.save(f"{filename}.png")
     return f"{filename}.png", control_image