Rag/rag transition 1

[xhr15]

See A RAG Library for Elixir

We want to turn chatbot_ex into a RAG system that answers question about (ecto)[https://hex.pm/packages/ecto]. Out of the box, chatbot_ex knows nothing about ecto

To do this, we first add rag as dependency and run mix deps.get.

  defp deps do
    [
      ...
      {:rag, "~> 0.2.0"},
      ...
    ]
  end

This gives us four additional mix tasks:

mix rag.gen_eval        # Generates an evaluation script
mix rag.gen_rag_module  # Generates a module containing RAG related code
mix rag.gen_servings    # Generates `Nx.Serving`s to run an embedding model and an LLM
mix rag.install         # Installs the rag library

Let's try the installer! As the chatbot_ex project already has a postgres database, we go with the pgvector
as vector store.

mix rag.install --vector-store pgvector

This will generate a bunch of files into your project and update others. This PR shows the generated files. It's only to be used with the blog post :)