Retriever: MultiQueryRetriever #177
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Description
This PR adds
MultiQueryRetrieverfor improved retrieval.Described in detail by LangChain docs:
https://python.langchain.com/docs/modules/data_connection/retrievers/MultiQueryRetriever
Changes
MultiQueryRetrieverBaseRetrieverpatched to support asyncio for all retrieversHow Tested
TODOs
Connectorwith multiplesource_type. E.g.source_type=['vectorstore', 'retriever']. Currently theRETRIEVER_TARGETonly allowsvectorstore. This is supported in the type, but the editor needs updates tois_valid_connectionfixed in Chain editor node connections now support List[ChainNode] #182