Update app.py

app.py

@@ -155,7 +155,7 @@ 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=0.3)
+        retriever = VectorIndexRetriever(index=index, similarity_top_k=3, vector_store_query_mode="hybrid", embed_model=embed_model, alpha=0.2)
 
         current_collection = "BANDI_SISTEMA_PUGLIA"
         return "collezione settata"