LightRAG/examples/lightrag_ollama_demo.py

import asyncio
import nest_asyncio

nest_asyncio.apply()
import os
import inspect
import logging
from lightrag import LightRAG, QueryParam
from lightrag.llm.ollama import ollama_model_complete, ollama_embed
from lightrag.utils import EmbeddingFunc
from lightrag.kg.shared_storage import initialize_pipeline_status

WORKING_DIR = "./dickens"

logging.basicConfig(format="%(levelname)s:%(message)s", level=logging.INFO)

if not os.path.exists(WORKING_DIR):
    os.mkdir(WORKING_DIR)

async def initialize_rag():
    rag = LightRAG(
        working_dir=WORKING_DIR,
        llm_model_func=ollama_model_complete,
        llm_model_name="gemma2:2b",
        llm_model_max_async=4,
        llm_model_max_token_size=32768,
        llm_model_kwargs={"host": "http://localhost:11434", "options": {"num_ctx": 32768}},
        embedding_func=EmbeddingFunc(
            embedding_dim=768,
            max_token_size=8192,
            func=lambda texts: ollama_embed(
                texts, embed_model="nomic-embed-text", host="http://localhost:11434"
            ),
        ),
    )

    await rag.initialize_storages()
    await initialize_pipeline_status()
    
    return rag

async def print_stream(stream):
    async for chunk in stream:
        print(chunk, end="", flush=True)

def main():
    # Initialize RAG instance
    rag = asyncio.run(initialize_rag())

    # Insert example text
    with open("./book.txt", "r", encoding="utf-8") as f:
        rag.insert(f.read())

    # Test different query modes
    print("\nNaive Search:")
    print(
        rag.query("What are the top themes in this story?", param=QueryParam(mode="naive"))
    )

    print("\nLocal Search:")
    print(
        rag.query("What are the top themes in this story?", param=QueryParam(mode="local"))
    )

    print("\nGlobal Search:")
    print(
        rag.query("What are the top themes in this story?", param=QueryParam(mode="global"))
    )

    print("\nHybrid Search:")
    print(
        rag.query("What are the top themes in this story?", param=QueryParam(mode="hybrid"))
    )

    # stream response
    resp = rag.query(
        "What are the top themes in this story?",
        param=QueryParam(mode="hybrid", stream=True),
    )

    if inspect.isasyncgen(resp):
        asyncio.run(print_stream(resp))
    else:
        print(resp)

if __name__ == "__main__":
    main()