Fix app.py

Fix the bug where the default value of resolution cannot be used

app.py

@@ -55,7 +55,8 @@ model.eval()
 # def predict(image_1, image_2):
 #     images = [image_1, image_2]
 @spaces.GPU
-def predict(image, resolution='1024x1024'):
+def predict(image, resolution):
+    resolution = f"{image.shape[1]}x{image.shape[0]}" if resolution == '' else resolution
     # Image is a RGB numpy array.
     resolution = [int(int(reso)//32*32) for reso in resolution.strip().split('x')]
     images = [image]