langchain/templates/rag-chroma-multi-modal/README.md

# rag-chroma-multi-modal

Presentations (slide decks, etc) contain visual content that challenges conventional RAG.

Multi-modal LLMs unlock new ways to build apps over visual content like presentations.
 
This template performs multi-modal RAG using Chroma with multi-modal OpenCLIP embeddings and OpenAI GPT-4V.

## Input

Supply a slide deck as pdf in the `/docs` directory. 

Create your vectorstore with: 

```
poetry install
python ingest.py
```

## Embeddings

This template will use [OpenCLIP](https://github.com/mlfoundations/open_clip) multi-modal embeddings.

You can select different options (see results [here](https://github.com/mlfoundations/open_clip/blob/main/docs/openclip_results.csv)).

The first time you run the app, it will automatically download the multimodal embedding model.

By default, LangChain will use an embedding model with reasonably strong performance, `ViT-H-14`.

You can choose alternative `OpenCLIPEmbeddings` models in `rag_chroma_multi_modal/ingest.py`:
```
vectorstore_mmembd = Chroma(
    collection_name="multi-modal-rag",
    persist_directory=str(re_vectorstore_path),
    embedding_function=OpenCLIPEmbeddings(
        model_name="ViT-H-14", checkpoint="laion2b_s32b_b79k"
    ),
)
```

## LLM

The app will retrieve images using multi-modal embeddings, and pass them to GPT-4V.

## Environment Setup

Set the `OPENAI_API_KEY` environment variable to access the OpenAI GPT-4V.

## 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-multi-modal
```

If you want to add this to an existing project, you can just run:

```shell
langchain app add rag-chroma-multi-modal
```

And add the following code to your `server.py` file:
```python
from rag_chroma import chain as rag_chroma_chain

add_routes(app, rag_chroma_chain, path="/rag-chroma-multi-modal")
```

(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=<your-api-key>
export LANGCHAIN_PROJECT=<your-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-multi-modal/playground](http://127.0.0.1:8000/rag-chroma-multi-modal/playground)  

We can access the template from code with:

```python
from langserve.client import RemoteRunnable

runnable = RemoteRunnable("http://localhost:8000/rag-chroma-multi-modal")
```