Update app.py

app.py

@@ -156,7 +156,7 @@ def main():
             vector_store, storage_context=storage_context
         )
 
-        retriever = VectorIndexRetriever(index=index, similarity_top_k=3, vector_store_query_mode="hybrid", embed_model=embed_model, alpha=0.5)
+        retriever = VectorIndexRetriever(index=index, similarity_top_k=4, vector_store_query_mode="hybrid", embed_model=embed_model, alpha=0.5)
 
         current_collection = "BANDI_SISTEMA_PUGLIA"
         return "collezione settata"
@@ -199,7 +199,7 @@ def main():
                     vector_store, storage_context=storage_context
                 )
 
-                retriever = VectorIndexRetriever(index=index, similarity_top_k=4, vector_store_query_mode="hybrid", embed_model=embed_model, alpha=0.5)
+                retriever = VectorIndexRetriever(index=index, similarity_top_k=3, vector_store_query_mode="hybrid", embed_model=embed_model, alpha=0.5)
             else:
                 chat_engine_bandi.reset()
                 chat_engine_bandi_sistema_puglia.reset()
@@ -223,7 +223,7 @@ def main():
                     vector_store, storage_context=storage_context
                 )
 
-                retriever = VectorIndexRetriever(index=index, similarity_top_k=4, vector_store_query_mode="hybrid", embed_model=embed_model, alpha=0.4)     
+                retriever = VectorIndexRetriever(index=index, similarity_top_k=3, vector_store_query_mode="hybrid", embed_model=embed_model, alpha=0.4)     
             
             current_collection = selected_collection