本示例介绍如何使用 LangChain 与 Anthropic models.

安装

pip install -qU langchain-anthropic

环境设置

我们需要获取一个 Anthropic API 密钥并设置 ANTHROPIC_API_KEY 环境变量：

from getpass import getpass

if "ANTHROPIC_API_KEY" not in os.environ:
    os.environ["ANTHROPIC_API_KEY"] = getpass()

使用方法

from langchain_anthropic import AnthropicLLM
from langchain_core.prompts import PromptTemplate

template = """Question: {question}

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

prompt = PromptTemplate.from_template(template)

model = AnthropicLLM(model="claude-2.1")

chain = prompt | model

chain.invoke({"question": "What is LangChain?"})

'\nLangChain is a decentralized blockchain network that leverages AI and machine learning to provide language translation services.'