Update app.py

app.py

@@ -62,9 +62,7 @@ retriever2 = PineconeHybridSearchRetriever(
     embeddings=embed, sparse_encoder=splade_encoder, index=index, namespace='lmsys', top_k=value2
 )
 
-retriever = EnsembleRetriever(
-    retrievers=[retriever1, retriever2, weights=[0.5,0.5]
-)
+retriever = EnsembleRetriever(retrievers=[retriever1, retriever2], weights=[0.5,0.5])
 
 
 LANGCHAIN_TRACING_V2 = os.getenv('LANGCHAIN_TRACING_V2')