RetrievalQAWithSourcesChain()Optional memory object.
Optional list of callback handlers (or callback manager).
Whether or not run in verbose mode. In verbose mode, some intermediate logs
Optional list of tags associated with the chain.
Optional metadata associated with the chain.
[DEPRECATED] Use callbacks instead.
Keys expected to be in the chain input.
Keys expected to be in the chain output.
Question-answering with sources over an index.
Set the chain verbosity.