Is it possible to implement RAG by fine-

Depends on how you're implementing it. For most use-cases it isn't necessary. It's covered here: https://docs.llamaindex.ai/en/stable/optimizing/fine-tuning/fine-tuning/

thank you By the way, have you ever used Langchain?

Actually, I'm going for an interview at a small company next week, and they say they use Langchain. Are there any knowledge I need to know?

There are quite a bit of similarities. I'd read the composition section, it covers the concepts: https://python.langchain.com/docs/modules/composition/

Okay thank you, are you AI? You answer like an assistant kkk

I'm not 😅

Oh and the company says they will also use RAG. I know how RAG works, but do I need to know more details?

For example, how does the assistant respond when you send a query? In other words, what algorithm does the assistant use to answer?
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Sorry, I'm currently a front-end developer and I've been trying a lot lately because I want to change jobs. That's why I'm so nervous and worried that's why I'm asking these questions. sorry