🦜️🔗 This is a very simple re-implementation of LangChain, in ~100 lines of code

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Learning resource langchain-mini
Overview

🦜️ 🔗 LangChain-mini

This is a very simple re-implementation of LangChain, in ~100 lines of code. In essence, it is an LLM (GPT-3.5) powered chat application that is able to use tools (Google search and a calculator) in order to hold conversations and answer questions.

Here's an example:

Q: What is the world record for solving a rubiks cube?
The world record for solving a Rubik's Cube is 4.69 seconds, held by Yiheng Wang (China).
Q: Can a robot solve it faster?
The fastest time a robot has solved a Rubik's Cube is 0.637 seconds.
Q: Who made this robot?
Infineon created the robot that solved a Rubik's Cube in 0.637 seconds.
Q: What time would an average human expect for solving?
It takes the average person about three hours to solve a Rubik's cube for the first time.

This is not intended to be a replacement for LangChain, instead it was built for fun and educational purposes. If you're interested in how LangChain, and similar tools work, this is a good starting point.

For more information about this project, read the accompanying blogpost - Re-implementing LangChain in 100 lines of code

Running / developing

Install dependencies, and run (with node >= v18):

% npm install

You'll need to have both an OpenAI and SerpApi keys. These can be supplied to the application via a .env file:

OPENAI_API_KEY="..."
SERPAPI_API_KEY="..."

You can now run the chain:

% node index.mjs
How can I help? what was the name of the first man on the moon?
Neil Armstrong
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Comments
  • Cross-fertilisation with BingChain

    Cross-fertilisation with BingChain

    @nicsurpatanu - Love some of your improvements in your fork! Looks like we had some of the same ideas...

    Maybe you could take a look at BingChain and we could collaborate on further iterations?

    opened by MikeRalphson 0
  • Error- Cannot read properties of undefined (reading '0')

    Error- Cannot read properties of undefined (reading '0')

    Hi! Thank you very much for your work. Please tell me which way to look. When I start, I get this error, I see the problem, but I can't figure out what to do.

    How can I help? Who is Neil Armstrong?
file:///User/GitHub/langchain-mini/index.mjs:59
    .then((res) => res.choices[0].text)
                              ^

TypeError: Cannot read properties of undefined (reading '0')
    at file:///User/GitHub/langchain-mini/index.mjs:59:31
    at process.process Ticks And Rejection (node:internal/process/task_queues:95:5)
    at asynccomplete Prompt (file:///User/GitHub/langchain-mini/index.mjs:43:3)
    at async answer Question (file:///User/GitHub/langchain-mini/index.mjs:77:22)
    at async file:///User/GitHub/langchain-mini/index.mjs:109:18

Node.js v18.15.0

    The line index.mjs:59 says .then((res) => res.choices[0].text)

    opened by brinrbc 3
Owner
Colin Eberhardt
Hi - I'm Colin.
Colin Eberhardt
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