bm = 200 + cut off 0.35

index_retriever.py

@@ -46,13 +46,13 @@ def create_query_engine(vector_index):
         
         bm25_retriever = BM25Retriever.from_defaults(
             docstore=vector_index.docstore, 
-            similarity_top_k=150 
+            similarity_top_k=200 
         )
         
         vector_retriever = VectorIndexRetriever(
             index=vector_index, 
             similarity_top_k=150,
-            similarity_cutoff=0.55
+            similarity_cutoff=0.35
         )
         
         hybrid_retriever = QueryFusionRetriever(