Update app

app.py

@@ -440,6 +440,7 @@ def images_from_molecule():
             "How many images would you like to be retrieve?",
             ("5", "10", "20")
         )
+        top_n = int(top_n)
 
         img_features_torch = torch.load(image_features, map_location=device)
         img_features = img_features_torch["img_features"]