Init with existing index in non-default location not working about ragatouille

[bclavie]

Hey Lars! Nice catch, I think know exactly how this got introduced -- as a workaround for an issue in loading configs for Searcher upstream, we let it fetch the config from the checkpoint without overrides, but it means that it defaults to the generation-time "root"!

I've pushed a workaround in #45, should be good to go!

(Also, to convert to langchain, simply doing:

RAG = RAGPretrainedModel.from_index(f"/mnt/index/.ragatouille/colbert/indexes/{INDEX_NAME}/")
retriever = RAG.as_langchain_retriever()

should be enough, passing the index name again isn't needed as the main RAG object has already initiated itself against the index)

[LarsAC]

Thanks for confirmation and quick resolution - confirmed working.