GPT & LangChain Demo

Use the new GPT-* api to build a chatGPT chatbot for multiple Large PDF files.

Tech stack used includes LangChain, Pinecone, Typescript, Openai, and Next.js.

Development

pnpm install

Copy .env.example into .env
Visit openai to retrieve API keys and insert into your .env file.
Visit pinecone to create and retrieve your API keys, and also retrieve your environment and index name from the dashboard.

In the scripts/config folder, replace the PINECONE_NAME_SPACE with a namespace where you'd like to store your embeddings on Pinecone when you run pnpm run ingest. This namespace will later be used for queries and retrieval.
In utils/makechain.ts chain change the QA_PROMPT for your own usecase. Change modelName in new OpenAIChat to gpt-3.5-turbo, if you don't have access to gpt-4. Please verify outside this repo that you have access to gpt-4, otherwise the application will not work with it.

This repo can load multiple PDF files

Inside docs folder, add your pdf files or folders that contain pdf files.
Run the script npm run ingest to 'ingest' and embed your docs. If you run into errors troubleshoot below.
Check Pinecone dashboard to verify your namespace and vectors have been added.

First, run the development server:

npm run dev
# or
yarn dev
# or
pnpm dev

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

General errors

Make sure you're running the latest Node version. Run node -v
Try a different PDF or convert your PDF to text first. It's possible your PDF is corrupted, scanned, or requires OCR to convert to text.
Console.log the env variables and make sure they are exposed.
Make sure you're using the same versions of LangChain and Pinecone as this repo.
Check that you've created an .env file that contains your valid (and working) API keys, environment and index name.
If you change modelName in OpenAIChat note that the correct name of the alternative model is gpt-3.5-turbo
Make sure you have access to gpt-4 if you decide to use. Test your openAI keys outside the repo and make sure it works and that you have enough API credits.
Check that you don't have multiple OPENAPI keys in your global environment. If you do, the local env file from the project will be overwritten by systems env variable.
Try to hard code your API keys into the process.env variables.

Pinecone errors

Make sure your pinecone dashboard environment and index matches the one in the pinecone.ts and .env files.
Check that you've set the vector dimensions to 1536.
Make sure your pinecone namespace is in lowercase.
Pinecone indexes of users on the Starter(free) plan are deleted after 7 days of inactivity. To prevent this, send an API request to Pinecone to reset the counter before 7 days.
Retry from scratch with a new Pinecone project, index, and cloned repo.