llama-index packs neo4j_query_engine integration
Project description
Neo4j Query Engine Pack
This LlamaPack creates a Neo4j query engine, and executes its query
function. This pack offers the option of creating multiple types of query engines, namely:
- Knowledge graph vector-based entity retrieval (default if no query engine type option is provided)
- Knowledge graph keyword-based entity retrieval
- Knowledge graph hybrid entity retrieval
- Raw vector index retrieval
- Custom combo query engine (vector similarity + KG entity retrieval)
- KnowledgeGraphQueryEngine
- KnowledgeGraphRAGRetriever
CLI Usage
You can download llamapacks directly using llamaindex-cli
, which comes installed with the llama-index
python package:
llamaindex-cli download-llamapack Neo4jQueryEnginePack --download-dir ./neo4j_pack
You can then inspect the files at ./neo4j_pack
and use them as a template for your own project!
Code Usage
You can download the pack to a ./neo4j_pack
directory:
from llama_index.core.llama_pack import download_llama_pack
# download and install dependencies
Neo4jQueryEnginePack = download_llama_pack(
"Neo4jQueryEnginePack", "./neo4j_pack"
)
From here, you can use the pack, or inspect and modify the pack in ./neo4j_pack
.
Then, you can set up the pack like so:
pip install llama-index-readers-wikipedia
# Load the docs (example of Paleo diet from Wikipedia)
from llama_index.readers.wikipedia import WikipediaReader
loader = WikipediaReader()
docs = loader.load_data(pages=["Paleolithic diet"], auto_suggest=False)
print(f"Loaded {len(docs)} documents")
# get Neo4j credentials (assume it's stored in credentials.json)
with open("credentials.json") as f:
neo4j_connection_params = json.load(f)
username = neo4j_connection_params["username"]
password = neo4j_connection_params["password"]
url = neo4j_connection_params["url"]
database = neo4j_connection_params["database"]
# create the pack
neo4j_pack = Neo4jQueryEnginePack(
username=username, password=password, url=url, database=database, docs=docs
)
Optionally, you can pass in the query_engine_type
from Neo4jQueryEngineType
to construct Neo4jQueryEnginePack
. If query_engine_type
is not defined, it defaults to Knowledge Graph vector based entity retrieval.
from llama_index.core.packs.neo4j_query_engine.base import Neo4jQueryEngineType
# create the pack
neo4j_pack = Neo4jQueryEnginePack(
username=username,
password=password,
url=url,
database=database,
docs=docs,
query_engine_type=Neo4jQueryEngineType.KG_HYBRID,
)
Neo4jQueryEnginePack
is a enum defined as follows:
class Neo4jQueryEngineType(str, Enum):
"""Neo4j query engine type"""
KG_KEYWORD = "keyword"
KG_HYBRID = "hybrid"
RAW_VECTOR = "vector"
RAW_VECTOR_KG_COMBO = "vector_kg"
KG_QE = "KnowledgeGraphQueryEngine"
KG_RAG_RETRIEVER = "KnowledgeGraphRAGRetriever"
The run()
function is a light wrapper around query_engine.query()
, see a sample query below.
response = neo4j_pack.run("Tell me about the benefits of paleo diet.")
You can also use modules individually.
# call the query_engine.query()
query_engine = neo4j_pack.query_engine
response = query_engine.query("query_str")
Project details
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