langchain+GPT+neo4j 图数据库

neo4j版本是5.11.0,langchain的版本 0.0.288

下载apoc插件

https://neo4j.com/docs/apoc/current/installation/

neo4j.conf文件把apoc.*添加到dbms.security.procedures.unrestricted配置项

使用return apoc.version()来查看是否安装成功

pip install neo4j

图

参考官网：https://python.langchain.com/docs/use_cases/more/graph/graph_cypher_qa

from langchain.chat_models import ChatOpenAI
from langchain.chains import GraphCypherQAChain
from langchain.graphs import Neo4jGraph
import os
os.environ["OPENAI_API_KEY"] = 'xxx'
graph = Neo4jGraph(
    url="bolt://localhost:7687", username="neo4j", password="xxx"
)

chain = GraphCypherQAChain.from_llm(
    ChatOpenAI(temperature=0), graph=graph, verbose=True, return_intermediate_steps=True
)

result = chain("Who played in Top Gun?")
print(f"Intermediate steps: {result['intermediate_steps']}")
print(f"Final answer: {result['result']}")