# rag-chroma-private This template performs RAG with no reliance on external APIs. It utilizes Ollama the LLM, GPT4All for embeddings, and Chroma for the vectorstore. The vectorstore is created in `chain.py` and by default indexes a [popular blog posts on Agents](https://lilianweng.github.io/posts/2023-06-23-agent/) for question-answering. ## Environment Setup To set up the environment, you need to download Ollama. Follow the instructions [here](https://python.langchain.com/docs/integrations/chat/ollama). You can choose the desired LLM with Ollama. This template uses `llama2:7b-chat`, which can be accessed using `ollama pull llama2:7b-chat`. There are many other options available [here](https://ollama.ai/library). This package also uses [GPT4All](https://python.langchain.com/docs/integrations/text_embedding/gpt4all) embeddings. ## Usage To use this package, you should first have the LangChain CLI installed: ```shell pip install -U langchain-cli ``` To create a new LangChain project and install this as the only package, you can do: ```shell langchain app new my-app --package rag-chroma-private ``` If you want to add this to an existing project, you can just run: ```shell langchain app add rag-chroma-private ``` And add the following code to your `server.py` file: ```python from rag_chroma_private import chain as rag_chroma_private_chain add_routes(app, rag_chroma_private_chain, path="/rag-chroma-private") ``` (Optional) Let's now configure LangSmith. LangSmith will help us trace, monitor and debug LangChain applications. LangSmith is currently in private beta, you can sign up [here](https://smith.langchain.com/). If you don't have access, you can skip this section ```shell export LANGCHAIN_TRACING_V2=true export LANGCHAIN_API_KEY= export LANGCHAIN_PROJECT= # if not specified, defaults to "default" ``` If you are inside this directory, then you can spin up a LangServe instance directly by: ```shell langchain serve ``` This will start the FastAPI app with a server is running locally at [http://localhost:8000](http://localhost:8000) We can see all templates at [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs) We can access the playground at [http://127.0.0.1:8000/rag-chroma-private/playground](http://127.0.0.1:8000/rag-chroma-private/playground) We can access the template from code with: ```python from langserve.client import RemoteRunnable runnable = RemoteRunnable("http://localhost:8000/rag-chroma-private") ``` The package will create and add documents to the vector database in `chain.py`. By default, it will load a popular blog post on agents. However, you can choose from a large number of document loaders [here](https://python.langchain.com/docs/integrations/document_loaders).