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#Environment Setup cd vector_knowledge_graph python -m venv venv source venv/bin/activate pip install fastapi uvicorn openai psycopg2-binary sqlalchemy
#Create a Database: Create a new PostgreSQL database. CREATE EXTENSION vector; CREATE TABLE knowledge ( id SERIAL PRIMARY KEY, embedding vector(512) NOT NULL, -- assuming 512 dimensions for embeddings metadata JSONB ); CREATE INDEX ON knowledge USING ivfflat (embedding);
#Application Code
from fastapi import FastAPI
app = FastAPI()
@app.get("/") async def read_root(): return {"Hello": "World"} Database Client (app/vector_db/client.py): Implement a simple client for connecting to the database and inserting/fetching vectors.
python Copy code import psycopg2 from psycopg2.extras import Json
def insert_embedding(embedding, metadata): conn = psycopg2.connect("dbname=your_db user=your_user") cur = conn.cursor() cur.execute("INSERT INTO knowledge (embedding, metadata) VALUES (%s, %s)", (embedding, Json(metadata))) conn.commit() cur.close() conn.close()
def search_embedding(embedding): conn = psycopg2.connect("dbname=your_db user=your_user") cur = conn.cursor() cur.execute("SELECT id, metadata FROM knowledge ORDER BY embedding <-> %s LIMIT 5", (embedding,)) results = cur.fetchall() cur.close() conn.close() return results 5. LLM Integration At this stage, we'll need to implement the logic to interact with OpenAI's API to generate and process embeddings. Since this involves using OpenAI's services, ensure you have an API key and have agreed to their terms of use.
- Running the Application With the basic components in place, you can start the FastAPI application using uvicorn:
bash Copy code uvicorn app.api.main:app --reload