Update app.py

app.py

@@ -190,6 +190,9 @@ top_k = st.sidebar.slider("Number of Top Hits Generated",min_value=1,max_value=5
 # This function will search all wikipedia articles for passages that
 # answer the query
 def search_func(query, top_k=top_k):
+    
+    global bi_encoder, cross_encoder
+    
     st.write(f"Search Query: {query}")
     
     if url_text: