remove duplicated code

app.py

@@ -8,13 +8,6 @@ def get_number_of_cats(file_name):
 
 learn = load_learner('./cat_counter.pkl')
 
-mapping = {'cat_counter/cat': 1.0, 'cat_counter/two cats': 2.0, 'cat_counter/three cats': 3.0}
-
-def get_number_of_cats(file_name): 
-  return mapping.get(str(file_name.parent), 0)
-
-learn = load_learner('cat_counter.pkl')
-
 def predict(img):
     img = PILImage.create(img)
     pred,pred_idx,probs = learn.predict(img)