emerleite / fully-local-pdf-chatbot

Yes, it's another chat over documents implementation... but this one is entirely local!

🏠 Fully Client-Side Chat Over Documents

Yes, it's another chat over documents implementation... but this one is entirely local!

It's a Next.js app that read the content of an uploaded PDF, chunks it, adds it to a vector store, and performs RAG, all client side. You can even turn off your WiFi after the site loads!

You can see a live version at https://webml-demo.vercel.app.

Users will need to download and set up Ollama, then run the following commands to allow the site access to a locally running Mistral instance:

Mac/Linux

$ OLLAMA_ORIGINS=https://webml-demo.vercel.app OLLAMA_HOST=127.0.0.1:11435 ollama serve

Then, in another terminal window:

$ OLLAMA_HOST=127.0.0.1:11435 ollama pull mistral

Windows

$ set OLLAMA_ORIGINS=https://webml-demo.vercel.app
set OLLAMA_HOST=127.0.0.1:11435
ollama serve

Then, in another terminal window:

$ set OLLAMA_HOST=127.0.0.1:11435
ollama pull mistral

⚡ Stack

It uses the following:

• Voy as the vector store, fully WASM in the browser.
• Ollama to run an LLM locally and expose it to the web app.
• LangChain.js to call the models, perform retrieval, and generally orchestrate all the pieces.
• Transformers.js to run open source Nomic embeddings in the browser.
  • For more speed on some machines, switch to "Xenova/all-MiniLM-L6-v2" in app/worker.ts.

I wanted to run as much of the app as possible directly in the browser, but you can swap in Ollama embeddings as well.

🔱 Forking

To run/deploy this yourself, simply fork this repo and install the required dependencies with yarn.

There are no required environment variables!

📖 Further reading

For a bit more on this topic, check out my blog post on Ollama or my Google Summit talk on building with LLMs in the browser.

🙏 Thank you!

Special thanks to @dawchihliou for making Voy, @jmorgan and @mchiang0610 for making Ollama and for your feedback, and @xenovacom for making Transformers.js.

For more, follow me on Twitter @Hacubu!