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Petals runs 100B+ language models at home, BitTorrent-style.

This notebook goes over how to use Langchain with Petals.

Install petals

The petals package is required to use the Petals API. Install petals using pip3 install petals.

For Apple Silicon(M1/M2) users please follow this guide to install petals

pip3 install petals


import os
from langchain.llms import Petals
from langchain.prompts import PromptTemplate
from langchain.chains import LLMChain

Set the Environment API Key

Make sure to get your API key from Huggingface.

from getpass import getpass


Create the Petals instance

You can specify different parameters such as the model name, max new tokens, temperature, etc.

# this can take several minutes to download big files!

llm = Petals(model_name="bigscience/bloom-petals")
    Downloading:   1%|▏                        | 40.8M/7.19G [00:24<15:44, 7.57MB/s]

Create a Prompt Template

We will create a prompt template for Question and Answer.

template = """Question: {question}

Answer: Let's think step by step."""

prompt = PromptTemplate(template=template, input_variables=["question"])

Initiate the LLMChain

llm_chain = LLMChain(prompt=prompt, llm=llm)

Run the LLMChain

Provide a question and run the LLMChain.

question = "What NFL team won the Super Bowl in the year Justin Beiber was born?"