pcx_content_type | title | meta | ||
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content |
Langchain |
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LangChain is the most popular framework for building AI applications powered by large language models (LLMs).
LangChain publishes multiple Python packages. The following are provided by the Workers runtime:
langchain
(version0.1.8
)langchain-core
(version0.1.25
)langchain-openai
(version0.0.6
)
{{}}
Clone the cloudflare/python-workers-examples
repository and run the LangChain example:
git clone https://github.com/cloudflare/python-workers-examples
cd 04-langchain
npx wrangler@latest dev
---
filename: index.py
---
from js import Response
from langchain_core.prompts import PromptTemplate
from langchain_openai import OpenAI
async def on_fetch(request, env):
prompt = PromptTemplate.from_template("Complete the following sentence: I am a {profession} and ")
llm = OpenAI(api_key=env.API_KEY)
chain = prompt | llm
res = await chain.ainvoke({"profession": "electrician"})
return Response.new(res.split(".")[0].strip())