Update app.py

app.py

@@ -16,7 +16,7 @@ def normalize_image(img):
 
 def predict_top_classes(img, num_top_classes=5):
      img = img.convert('RGB')
-     img_data = _normalize_img(img)
+     img_data = normalize_image(img)
      x = np.array(img_data)
      x = np.expand_dims(x, axis=0)
      temp = model.predict(x)