Update app.py

app.py

@@ -63,7 +63,7 @@ retriever2 = PineconeHybridSearchRetriever(
 )
 
 retriever = EnsembleRetriever(
-    retrievers=[retriever1, retriever2, retriever3], weights=[0.5,0.5]
+    retrievers=[retriever1, retriever2, weights=[0.5,0.5]
 )