Adding keyword-based search to privategpt

[cloudrage999]

hi guys, i as wondering can anybody implement this feature in this project ? because it will give much accurate results
i have a sample code snippet that may help you:

vectorstore_retriever = vectorstore.as_retriever(search_kwargs={"k": 3, "search_type": "mmr"})

keyword_retriever = BM25Retriever.from_documents(chunks)
keyword_retriever.k = 3

ensemble_retriever = EnsembleRetriever(
retrievers=[vectorstore_retriever, keyword_retriever],
retriever_weights={"vectorstore_retriever": 0.5, "keyword_retriever": 0.5},
search_kwargs={"search_type": "mmr"}
)