Update app.py

app.py

@@ -76,9 +76,11 @@ class SemanticSearch:
         self.fitted = True
 
     def call(self, text, return_data=True):
+        if not self.fitted:
+            raise Exception("The fit method must be called before the call method.")
         inp_emb = self.use([text])
         neighbors = self.nn.kneighbors(inp_emb, return_distance=False)[0]
-
+    
         if return_data:
             return [self.data[i] for i in neighbors]
         else:
@@ -115,6 +117,9 @@ def generate_text(openAI_key,prompt, engine="text-davinci-003"):
 
 def generate_answer(question,openAI_key):
     topn_chunks = recommender.call(question)
+    if not recommender.fitted:
+        st.error('The recommender is not fitted yet.')
+        return
     prompt = ""
     prompt += 'search results:\n\n'
     for c in topn_chunks: