Neo4j
This page covers how to use the Neo4j ecosystem within LangChain.
What is Neo4j?
Neo4j in a nutshell:
- Neo4j is an open-source database management system that specializes in graph database technology.
- Neo4j allows you to represent and store data in nodes and edges, making it ideal for handling connected data and relationships.
- Neo4j provides a Cypher Query Language, making it easy to interact with and query your graph data.
- With Neo4j, you can achieve high-performance graph traversals and queries, suitable for production-level systems.
- Get started quickly with Neo4j by visiting their website.
Installation and Setup
- Install the Python SDK with
pip install neo4j
Wrappers
VectorStore
There exists a wrapper around Neo4j vector index, allowing you to use it as a vectorstore, whether for semantic search or example selection.
To import this vectorstore:
from langchain.vectorstores import Neo4jVector
API Reference:
For a more detailed walkthrough of the Neo4j vector index wrapper, see this notebook
GraphCypherQAChain
There exists a wrapper around Neo4j graph database that allows you to generate Cypher statements based on the user input and use them to retrieve relevant information from the database.
from langchain.graphs import Neo4jGraph
from langchain.chains import GraphCypherQAChain
API Reference:
For a more detailed walkthrough of Cypher generating chain, see this notebook