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But this is a turn-key llm, that is built on langchain? A user doesn't need to dig into langchain themselves, right?

To be clear (apologies if I haven't made it so) this is not an LLM. This is an implementation of Rasa leveraging Langchain under the hood.

A user technically does not need to dig into Langchain themselves, but they would want to if they find their query results sub-optimal.

There are a many indexing strategies and superficial parameters you could modify to tune output response. They are mentioned in the README.md.