Update app.py

corrected module creation call

app.py

@@ -12,7 +12,7 @@ class_names = ['pizza', 'steak', 'sushi']
 
 ### 2. Model and transforms setup
 effnetb2, effnetb2_transforms = create_effnetb2_model(
-    num_classes=3,
+    output_classes=3,
 )
 
 #Load the saved weights