mayooear / chat-langchainjs Goto Github PK

This is a Next.js project bootstrapped with create-next-app.

First, create a new .env file from .env.example and add your OpenAI API key found here.

cp .env.example .env

Next, we'll need to load our data source.

Data ingestion happens in two steps.

First, you should run

pip install -r ingest/requirements.txt
sh ingest/download.sh

This will download our data source (in this case the Langchain docs ) and parse it.

Next, install dependencies and run the ingestion script:

yarn && yarn ingest

This will split text, create embeddings, store them in a vectorstore, and then save it to the data/ directory.

We save it to a directory because we only want to run the (expensive) data ingestion process once.

The Next.js server relies on the presence of the data/ directory. Please make sure to run this before moving on to the next step.

Then, run the development server:

yarn dev

Open http://localhost:3000 with your browser to see the result.

The production version of this repo is hosted on fly. To deploy your own server on Fly, you can use the provided fly.toml and Dockerfile as a starting point.

Note: As a Next.js app it seems like Vercel is a natural place to host this site. Unfortunately there are limitations to secure websockets using ws with Next.js which requires using a custom server which cannot be hosted on Vercel. Even using server side events, it seems, Vercel's serverless functions seem to prohibit streaming responses (e.g. see here)

This repo borrows heavily from

• ChatLangChain - for the backend and data ingestion logic
• LangChain Chat NextJS - for the frontend.

If you'd like to chat your own data, you need to:

1. Set up your own ingestion pipeline, and create a similar data/ directory with a vectorstore in it.
2. Change the prompt used in pages/api/util.ts - right now this tells the chatbot to only respond to questions about LangChain, so in order to get it to work on your data you'll need to update it accordingly.

The server should work just the same 😄