<center><h2>🚀 LightRAG: Simple and Fast Retrieval-Augmented Generation</h2></center>


![LightRAG Image](https://i-blog.csdnimg.cn/direct/567139f1a36e4564abc63ce5c12b6271.jpeg)

<div align='center'>
     <p>
        <a href='https://lightrag.github.io'><img src='https://img.shields.io/badge/Project-Page-Green'></a>
        <a href='https://youtu.be/oageL-1I0GE'><img src='https://badges.aleen42.com/src/youtube.svg'></a>
        <a href='https://arxiv.org/abs/2410.05779'><img src='https://img.shields.io/badge/arXiv-2410.05779-b31b1b'></a>
        <a href='https://learnopencv.com/lightrag'><img src='https://img.shields.io/badge/LearnOpenCV-blue'></a>
    </p>
     <p>
          <img src='https://img.shields.io/github/stars/hkuds/lightrag?color=green&style=social' />
        <img src="https://img.shields.io/badge/python-3.10-blue">
        <a href="https://pypi.org/project/lightrag-hku/"><img src="https://img.shields.io/pypi/v/lightrag-hku.svg"></a>
        <a href="https://pepy.tech/project/lightrag-hku"><img src="https://static.pepy.tech/badge/lightrag-hku/month"></a>
    </p>
    <p>
    <a href='https://discord.gg/yF2MmDJyGJ'><img src='https://discordapp.com/api/guilds/1296348098003734629/widget.png?style=shield'></a>
        <a href='https://github.com/HKUDS/LightRAG/issues/285'><img src='https://img.shields.io/badge/群聊-wechat-green'></a>
    </p>

This repository hosts the code of LightRAG. The structure of this code is based on [nano-graphrag](https://github.com/gusye1234/nano-graphrag).
![LightRAG Diagram](https://i-blog.csdnimg.cn/direct/b2aaf634151b4706892693ffb43d9093.png)
</div>

## 🎉 News
- [x] [2025.01.13]🎯📢Our team has released [MiniRAG](https://github.com/HKUDS/MiniRAG) making RAG simpler with small models.
- [x] [2025.01.06]🎯📢You can now [use PostgreSQL for Storage](#using-postgresql-for-storage).
- [x] [2024.12.31]🎯📢LightRAG now supports [deletion by document ID](https://github.com/HKUDS/LightRAG?tab=readme-ov-file#delete).
- [x] [2024.11.25]🎯📢LightRAG now supports seamless integration of [custom knowledge graphs](https://github.com/HKUDS/LightRAG?tab=readme-ov-file#insert-custom-kg), empowering users to enhance the system with their own domain expertise.
- [x] [2024.11.19]🎯📢A comprehensive guide to LightRAG is now available on [LearnOpenCV](https://learnopencv.com/lightrag). Many thanks to the blog author.
- [x] [2024.11.12]🎯📢LightRAG now supports [Oracle Database 23ai for all storage types (KV, vector, and graph)](https://github.com/HKUDS/LightRAG/blob/main/examples/lightrag_oracle_demo.py).
- [x] [2024.11.11]🎯📢LightRAG now supports [deleting entities by their names](https://github.com/HKUDS/LightRAG?tab=readme-ov-file#delete).
- [x] [2024.11.09]🎯📢Introducing the [LightRAG Gui](https://lightrag-gui.streamlit.app), which allows you to insert, query, visualize, and download LightRAG knowledge.
- [x] [2024.11.04]🎯📢You can now [use Neo4J for Storage](https://github.com/HKUDS/LightRAG?tab=readme-ov-file#using-neo4j-for-storage).
- [x] [2024.10.29]🎯📢LightRAG now supports multiple file types, including PDF, DOC, PPT, and CSV via `textract`.
- [x] [2024.10.20]🎯📢We’ve added a new feature to LightRAG: Graph Visualization.
- [x] [2024.10.18]🎯📢We’ve added a link to a [LightRAG Introduction Video](https://youtu.be/oageL-1I0GE). Thanks to the author!
- [x] [2024.10.17]🎯📢We have created a [Discord channel](https://discord.gg/yF2MmDJyGJ)! Welcome to join for sharing and discussions! 🎉🎉
- [x] [2024.10.16]🎯📢LightRAG now supports [Ollama models](https://github.com/HKUDS/LightRAG?tab=readme-ov-file#quick-start)!
- [x] [2024.10.15]🎯📢LightRAG now supports [Hugging Face models](https://github.com/HKUDS/LightRAG?tab=readme-ov-file#quick-start)!

## Algorithm Flowchart

![LightRAG Indexing Flowchart](https://learnopencv.com/wp-content/uploads/2024/11/LightRAG-VectorDB-Json-KV-Store-Indexing-Flowchart-scaled.jpg)
*Figure 1: LightRAG Indexing Flowchart - Img Caption : [Source](https://learnopencv.com/lightrag/)*
![LightRAG Retrieval and Querying Flowchart](https://learnopencv.com/wp-content/uploads/2024/11/LightRAG-Querying-Flowchart-Dual-Level-Retrieval-Generation-Knowledge-Graphs-scaled.jpg)
*Figure 2: LightRAG Retrieval and Querying Flowchart - Img Caption : [Source](https://learnopencv.com/lightrag/)*

## Install

* Install from source (Recommend)

```bash
cd LightRAG
pip install -e .
```
* Install from PyPI
```bash
pip install lightrag-hku
```

## Quick Start
* [Video demo](https://www.youtube.com/watch?v=g21royNJ4fw) of running LightRAG locally.
* All the code can be found in the `examples`.
* Set OpenAI API key in environment if using OpenAI models: `export OPENAI_API_KEY="sk-...".`
* Download the demo text "A Christmas Carol by Charles Dickens":
```bash
curl https://raw.githubusercontent.com/gusye1234/nano-graphrag/main/tests/mock_data.txt > ./book.txt
```
Use the below Python snippet (in a script) to initialize LightRAG and perform queries:

```python
import os
from lightrag import LightRAG, QueryParam
from lightrag.llm import gpt_4o_mini_complete, gpt_4o_complete

#########
# Uncomment the below two lines if running in a jupyter notebook to handle the async nature of rag.insert()
# import nest_asyncio
# nest_asyncio.apply()
#########

WORKING_DIR = "./dickens"


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

rag = LightRAG(
    working_dir=WORKING_DIR,
    llm_model_func=gpt_4o_mini_complete  # Use gpt_4o_mini_complete LLM model
    # llm_model_func=gpt_4o_complete  # Optionally, use a stronger model
)

with open("./book.txt") as f:
    rag.insert(f.read())

# Perform naive search
print(rag.query("What are the top themes in this story?", param=QueryParam(mode="naive")))

# Perform local search
print(rag.query("What are the top themes in this story?", param=QueryParam(mode="local")))

# Perform global search
print(rag.query("What are the top themes in this story?", param=QueryParam(mode="global")))

# Perform hybrid search
print(rag.query("What are the top themes in this story?", param=QueryParam(mode="hybrid")))

# Perform mix search (Knowledge Graph + Vector Retrieval)
# Mix mode combines knowledge graph and vector search:
# - Uses both structured (KG) and unstructured (vector) information
# - Provides comprehensive answers by analyzing relationships and context
# - Supports image content through HTML img tags
# - Allows control over retrieval depth via top_k parameter
print(rag.query("What are the top themes in this story?", param=QueryParam(
    mode="mix")))

```




<details>
<summary> Using Open AI-like APIs </summary>

* LightRAG also supports Open AI-like chat/embeddings APIs:
```python
async def llm_model_func(
    prompt, system_prompt=None, history_messages=[], keyword_extraction=False, **kwargs
) -> str:
    return await openai_complete_if_cache(
        "solar-mini",
        prompt,
        system_prompt=system_prompt,
        history_messages=history_messages,
        api_key=os.getenv("UPSTAGE_API_KEY"),
        base_url="https://api.upstage.ai/v1/solar",
        **kwargs
    )

async def embedding_func(texts: list[str]) -> np.ndarray:
    return await openai_embedding(
        texts,
        model="solar-embedding-1-large-query",
        api_key=os.getenv("UPSTAGE_API_KEY"),
        base_url="https://api.upstage.ai/v1/solar"
    )

rag = LightRAG(
    working_dir=WORKING_DIR,
    llm_model_func=llm_model_func,
    embedding_func=EmbeddingFunc(
        embedding_dim=4096,
        max_token_size=8192,
        func=embedding_func
    )
)
```
</details>

<details>
<summary> Using Hugging Face Models </summary>

* If you want to use Hugging Face models, you only need to set LightRAG as follows:
```python
from lightrag.llm import hf_model_complete, hf_embedding
from transformers import AutoModel, AutoTokenizer
from lightrag.utils import EmbeddingFunc

# Initialize LightRAG with Hugging Face model
rag = LightRAG(
    working_dir=WORKING_DIR,
    llm_model_func=hf_model_complete,  # Use Hugging Face model for text generation
    llm_model_name='meta-llama/Llama-3.1-8B-Instruct',  # Model name from Hugging Face
    # Use Hugging Face embedding function
    embedding_func=EmbeddingFunc(
        embedding_dim=384,
        max_token_size=5000,
        func=lambda texts: hf_embedding(
            texts,
            tokenizer=AutoTokenizer.from_pretrained("sentence-transformers/all-MiniLM-L6-v2"),
            embed_model=AutoModel.from_pretrained("sentence-transformers/all-MiniLM-L6-v2")
        )
    ),
)
```
</details>

<details>
<summary> Using Ollama Models </summary>

### Overview
If you want to use Ollama models, you need to pull model you plan to use and embedding model, for example `nomic-embed-text`.

Then you only need to set LightRAG as follows:

```python
from lightrag.llm import ollama_model_complete, ollama_embedding
from lightrag.utils import EmbeddingFunc

# Initialize LightRAG with Ollama model
rag = LightRAG(
    working_dir=WORKING_DIR,
    llm_model_func=ollama_model_complete,  # Use Ollama model for text generation
    llm_model_name='your_model_name', # Your model name
    # Use Ollama embedding function
    embedding_func=EmbeddingFunc(
        embedding_dim=768,
        max_token_size=8192,
        func=lambda texts: ollama_embedding(
            texts,
            embed_model="nomic-embed-text"
        )
    ),
)
```

### Increasing context size
In order for LightRAG to work context should be at least 32k tokens. By default Ollama models have context size of 8k. You can achieve this using one of two ways:

#### Increasing the `num_ctx` parameter in Modelfile.

1. Pull the model:
```bash
ollama pull qwen2
```

2. Display the model file:
```bash
ollama show --modelfile qwen2 > Modelfile
```

3. Edit the Modelfile by adding the following line:
```bash
PARAMETER num_ctx 32768
```

4. Create the modified model:
```bash
ollama create -f Modelfile qwen2m
```

#### Setup `num_ctx` via Ollama API.
Tiy can use `llm_model_kwargs` param to configure ollama:

```python
rag = LightRAG(
    working_dir=WORKING_DIR,
    llm_model_func=ollama_model_complete,  # Use Ollama model for text generation
    llm_model_name='your_model_name', # Your model name
    llm_model_kwargs={"options": {"num_ctx": 32768}},
    # Use Ollama embedding function
    embedding_func=EmbeddingFunc(
        embedding_dim=768,
        max_token_size=8192,
        func=lambda texts: ollama_embedding(
            texts,
            embed_model="nomic-embed-text"
        )
    ),
)
```
#### Fully functional example

There fully functional example `examples/lightrag_ollama_demo.py` that utilizes `gemma2:2b` model, runs only 4 requests in parallel and set context size to 32k.

#### Low RAM GPUs

In order to run this experiment on low RAM GPU you should select small model and tune context window (increasing context increase memory consumption). For example, running this ollama example on repurposed mining GPU with 6Gb of RAM required to set context size to 26k while using `gemma2:2b`. It was able to find 197 entities and 19 relations on `book.txt`.

</details>

### Query Param

```python
class QueryParam:
    mode: Literal["local", "global", "hybrid", "naive", "mix"] = "global"
    only_need_context: bool = False
    response_type: str = "Multiple Paragraphs"
    # Number of top-k items to retrieve; corresponds to entities in "local" mode and relationships in "global" mode.
    top_k: int = 60
    # Number of tokens for the original chunks.
    max_token_for_text_unit: int = 4000
    # Number of tokens for the relationship descriptions
    max_token_for_global_context: int = 4000
    # Number of tokens for the entity descriptions
    max_token_for_local_context: int = 4000
```

### Batch Insert

```python
# Basic Batch Insert: Insert multiple texts at once
rag.insert(["TEXT1", "TEXT2",...])

# Batch Insert with custom batch size configuration
rag = LightRAG(
    working_dir=WORKING_DIR,
    addon_params={
        "insert_batch_size": 20  # Process 20 documents per batch
    }
)
rag.insert(["TEXT1", "TEXT2", "TEXT3", ...])  # Documents will be processed in batches of 20
```

The `insert_batch_size` parameter in `addon_params` controls how many documents are processed in each batch during insertion. This is useful for:
- Managing memory usage with large document collections
- Optimizing processing speed
- Providing better progress tracking
- Default value is 10 if not specified

### Incremental Insert

```python
# Incremental Insert: Insert new documents into an existing LightRAG instance
rag = LightRAG(
     working_dir=WORKING_DIR,
     llm_model_func=llm_model_func,
     embedding_func=EmbeddingFunc(
          embedding_dim=embedding_dimension,
          max_token_size=8192,
          func=embedding_func,
     ),
)

with open("./newText.txt") as f:
    rag.insert(f.read())
```
### Separate Keyword Extraction
We've introduced a new function `query_with_separate_keyword_extraction` to enhance the keyword extraction capabilities. This function separates the keyword extraction process from the user's prompt, focusing solely on the query to improve the relevance of extracted keywords.

##### How It Works?
The function operates by dividing the input into two parts:
- `User Query`
- `Prompt`

It then performs keyword extraction exclusively on the `user query`. This separation ensures that the extraction process is focused and relevant, unaffected by any additional language in the `prompt`. It also allows the `prompt` to serve purely for response formatting, maintaining the intent and clarity of the user's original question.

##### Usage Example
This `example` shows how to tailor the function for educational content, focusing on detailed explanations for older students.

```python
rag.query_with_separate_keyword_extraction(
    query="Explain the law of gravity",
    prompt="Provide a detailed explanation suitable for high school students studying physics.",
    param=QueryParam(mode="hybrid")
)
```

### Using Neo4J for Storage

* For production level scenarios you will most likely want to leverage an enterprise solution
* for KG storage. Running Neo4J in Docker is recommended for seamless local testing.
* See: https://hub.docker.com/_/neo4j

```python
export NEO4J_URI="neo4j://localhost:7687"
export NEO4J_USERNAME="neo4j"
export NEO4J_PASSWORD="password"

# When you launch the project be sure to override the default KG: NetworkX
# by specifying kg="Neo4JStorage".

# Note: Default settings use NetworkX
# Initialize LightRAG with Neo4J implementation.
WORKING_DIR = "./local_neo4jWorkDir"

rag = LightRAG(
    working_dir=WORKING_DIR,
    llm_model_func=gpt_4o_mini_complete,  # Use gpt_4o_mini_complete LLM model
    graph_storage="Neo4JStorage", #<-----------override KG default
    log_level="DEBUG"  #<-----------override log_level default
)
```
see test_neo4j.py for a working example.

### Using PostgreSQL for Storage
For production level scenarios you will most likely want to leverage an enterprise solution. PostgreSQL can provide a one-stop solution for you as KV store, VectorDB (pgvector) and GraphDB (apache AGE).
* PostgreSQL is lightweight,the whole binary distribution including all necessary plugins can be zipped to 40MB: Ref to [Windows Release](https://github.com/ShanGor/apache-age-windows/releases/tag/PG17%2Fv1.5.0-rc0) as it is easy to install for Linux/Mac.
* If you prefer docker, please start with this image if you are a beginner to avoid hiccups (DO read the overview): https://hub.docker.com/r/shangor/postgres-for-rag
* How to start? Ref to: [examples/lightrag_zhipu_postgres_demo.py](https://github.com/HKUDS/LightRAG/blob/main/examples/lightrag_zhipu_postgres_demo.py)
* Create index for AGE example: (Change below `dickens` to your graph name if necessary)
  ```
  SET search_path = ag_catalog, "$user", public;
  CREATE INDEX idx_entity ON dickens."Entity" USING gin (agtype_access_operator(properties, '"node_id"'));
  ```
* Known issue of the Apache AGE: The released versions got below issue:
  > You might find that the properties of the nodes/edges are empty.
  > It is a known issue of the release version: https://github.com/apache/age/pull/1721
  >
  > You can Compile the AGE from source code and fix it.



### Insert Custom KG

```python
rag = LightRAG(
     working_dir=WORKING_DIR,
     llm_model_func=llm_model_func,
     embedding_func=EmbeddingFunc(
          embedding_dim=embedding_dimension,
          max_token_size=8192,
          func=embedding_func,
     ),
)

custom_kg = {
    "entities": [
        {
            "entity_name": "CompanyA",
            "entity_type": "Organization",
            "description": "A major technology company",
            "source_id": "Source1"
        },
        {
            "entity_name": "ProductX",
            "entity_type": "Product",
            "description": "A popular product developed by CompanyA",
            "source_id": "Source1"
        }
    ],
    "relationships": [
        {
            "src_id": "CompanyA",
            "tgt_id": "ProductX",
            "description": "CompanyA develops ProductX",
            "keywords": "develop, produce",
            "weight": 1.0,
            "source_id": "Source1"
        }
    ],
    "chunks": [
        {
            "content": "ProductX, developed by CompanyA, has revolutionized the market with its cutting-edge features.",
            "source_id": "Source1",
        },
        {
            "content": "PersonA is a prominent researcher at UniversityB, focusing on artificial intelligence and machine learning.",
            "source_id": "Source2",
        },
        {
            "content": "None",
            "source_id": "UNKNOWN",
        },
    ],
}

rag.insert_custom_kg(custom_kg)
```

### Delete
```python

rag = LightRAG(
     working_dir=WORKING_DIR,
     llm_model_func=llm_model_func,
     embedding_func=EmbeddingFunc(
          embedding_dim=embedding_dimension,
          max_token_size=8192,
          func=embedding_func,
     ),
)

#  Delete Entity: Deleting entities by their names
rag.delete_by_entity("Project Gutenberg")

#  Delete Document: Deleting entities and relationships associated with the document by doc id
rag.delete_by_doc_id("doc_id")
```

### Multi-file Type Support

The `textract` supports reading file types such as TXT, DOCX, PPTX, CSV, and PDF.

```python
import textract

file_path = 'TEXT.pdf'
text_content = textract.process(file_path)

rag.insert(text_content.decode('utf-8'))
```

### Graph Visualization

<details>
<summary> Graph visualization with html </summary>

* The following code can be found in `examples/graph_visual_with_html.py`

```python
import networkx as nx
from pyvis.network import Network

# Load the GraphML file
G = nx.read_graphml('./dickens/graph_chunk_entity_relation.graphml')

# Create a Pyvis network
net = Network(notebook=True)

# Convert NetworkX graph to Pyvis network
net.from_nx(G)

# Save and display the network
net.show('knowledge_graph.html')
```

</details>

<details>
<summary> Graph visualization with Neo4j </summary>

* The following code can be found in `examples/graph_visual_with_neo4j.py`

```python
import os
import json
from lightrag.utils import xml_to_json
from neo4j import GraphDatabase

# Constants
WORKING_DIR = "./dickens"
BATCH_SIZE_NODES = 500
BATCH_SIZE_EDGES = 100

# Neo4j connection credentials
NEO4J_URI = "bolt://localhost:7687"
NEO4J_USERNAME = "neo4j"
NEO4J_PASSWORD = "your_password"

def convert_xml_to_json(xml_path, output_path):
    """Converts XML file to JSON and saves the output."""
    if not os.path.exists(xml_path):
        print(f"Error: File not found - {xml_path}")
        return None

    json_data = xml_to_json(xml_path)
    if json_data:
        with open(output_path, 'w', encoding='utf-8') as f:
            json.dump(json_data, f, ensure_ascii=False, indent=2)
        print(f"JSON file created: {output_path}")
        return json_data
    else:
        print("Failed to create JSON data")
        return None

def process_in_batches(tx, query, data, batch_size):
    """Process data in batches and execute the given query."""
    for i in range(0, len(data), batch_size):
        batch = data[i:i + batch_size]
        tx.run(query, {"nodes": batch} if "nodes" in query else {"edges": batch})

def main():
    # Paths
    xml_file = os.path.join(WORKING_DIR, 'graph_chunk_entity_relation.graphml')
    json_file = os.path.join(WORKING_DIR, 'graph_data.json')

    # Convert XML to JSON
    json_data = convert_xml_to_json(xml_file, json_file)
    if json_data is None:
        return

    # Load nodes and edges
    nodes = json_data.get('nodes', [])
    edges = json_data.get('edges', [])

    # Neo4j queries
    create_nodes_query = """
    UNWIND $nodes AS node
    MERGE (e:Entity {id: node.id})
    SET e.entity_type = node.entity_type,
        e.description = node.description,
        e.source_id = node.source_id,
        e.displayName = node.id
    REMOVE e:Entity
    WITH e, node
    CALL apoc.create.addLabels(e, [node.entity_type]) YIELD node AS labeledNode
    RETURN count(*)
    """

    create_edges_query = """
    UNWIND $edges AS edge
    MATCH (source {id: edge.source})
    MATCH (target {id: edge.target})
    WITH source, target, edge,
         CASE
            WHEN edge.keywords CONTAINS 'lead' THEN 'lead'
            WHEN edge.keywords CONTAINS 'participate' THEN 'participate'
            WHEN edge.keywords CONTAINS 'uses' THEN 'uses'
            WHEN edge.keywords CONTAINS 'located' THEN 'located'
            WHEN edge.keywords CONTAINS 'occurs' THEN 'occurs'
           ELSE REPLACE(SPLIT(edge.keywords, ',')[0], '\"', '')
         END AS relType
    CALL apoc.create.relationship(source, relType, {
      weight: edge.weight,
      description: edge.description,
      keywords: edge.keywords,
      source_id: edge.source_id
    }, target) YIELD rel
    RETURN count(*)
    """

    set_displayname_and_labels_query = """
    MATCH (n)
    SET n.displayName = n.id
    WITH n
    CALL apoc.create.setLabels(n, [n.entity_type]) YIELD node
    RETURN count(*)
    """

    # Create a Neo4j driver
    driver = GraphDatabase.driver(NEO4J_URI, auth=(NEO4J_USERNAME, NEO4J_PASSWORD))

    try:
        # Execute queries in batches
        with driver.session() as session:
            # Insert nodes in batches
            session.execute_write(process_in_batches, create_nodes_query, nodes, BATCH_SIZE_NODES)

            # Insert edges in batches
            session.execute_write(process_in_batches, create_edges_query, edges, BATCH_SIZE_EDGES)

            # Set displayName and labels
            session.run(set_displayname_and_labels_query)

    except Exception as e:
        print(f"Error occurred: {e}")

    finally:
        driver.close()

if __name__ == "__main__":
    main()
```

</details>

### LightRAG init parameters

| **Parameter**                                | **Type** | **Explanation**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | **Default**                                                                                                 |
|----------------------------------------------| --- | |-------------------------------------------------------------------------------------------------------------|
| **working\_dir**                             | `str` | Directory where the cache will be stored                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | `lightrag_cache+timestamp`                                                                                  |
| **kv\_storage**                              | `str` | Storage type for documents and text chunks. Supported types: `JsonKVStorage`, `OracleKVStorage`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | `JsonKVStorage`                                                                                             |
| **vector\_storage**                          | `str` | Storage type for embedding vectors. Supported types: `NanoVectorDBStorage`, `OracleVectorDBStorage`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | `NanoVectorDBStorage`                                                                                       |
| **graph\_storage**                           | `str` | Storage type for graph edges and nodes. Supported types: `NetworkXStorage`, `Neo4JStorage`, `OracleGraphStorage`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | `NetworkXStorage`                                                                                           |
| **log\_level**                               |     | Log level for application runtime                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | `logging.DEBUG`                                                                                             |
| **chunk\_token\_size**                       | `int` | Maximum token size per chunk when splitting documents                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | `1200`                                                                                                      |
| **chunk\_overlap\_token\_size**              | `int` | Overlap token size between two chunks when splitting documents                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | `100`                                                                                                       |
| **tiktoken\_model\_name**                    | `str` | Model name for the Tiktoken encoder used to calculate token numbers                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | `gpt-4o-mini`                                                                                               |
| **entity\_extract\_max\_gleaning**           | `int` | Number of loops in the entity extraction process, appending history messages                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | `1`                                                                                                         |
| **entity\_summary\_to\_max\_tokens**         | `int` | Maximum token size for each entity summary                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | `500`                                                                                                       |
| **node\_embedding\_algorithm**               | `str` | Algorithm for node embedding (currently not used)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | `node2vec`                                                                                                  |
| **node2vec\_params**                         | `dict` | Parameters for node embedding                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | `{"dimensions": 1536,"num_walks": 10,"walk_length": 40,"window_size": 2,"iterations": 3,"random_seed": 3,}` |
| **embedding\_func**                          | `EmbeddingFunc` | Function to generate embedding vectors from text                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | `openai_embedding`                                                                                          |
| **embedding\_batch\_num**                    | `int` | Maximum batch size for embedding processes (multiple texts sent per batch)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | `32`                                                                                                        |
| **embedding\_func\_max\_async**              | `int` | Maximum number of concurrent asynchronous embedding processes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | `16`                                                                                                        |
| **llm\_model\_func**                         | `callable` | Function for LLM generation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | `gpt_4o_mini_complete`                                                                                      |
| **llm\_model\_name**                         | `str` | LLM model name for generation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | `meta-llama/Llama-3.2-1B-Instruct`                                                                          |
| **llm\_model\_max\_token\_size**             | `int` | Maximum token size for LLM generation (affects entity relation summaries)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | `32768`                                                                                                     |
| **llm\_model\_max\_async**                   | `int` | Maximum number of concurrent asynchronous LLM processes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | `16`                                                                                                        |
| **llm\_model\_kwargs**                       | `dict` | Additional parameters for LLM generation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |                                                                                                             |
| **vector\_db\_storage\_cls\_kwargs**         | `dict` | Additional parameters for vector database (currently not used)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |                                                                                                             |
| **enable\_llm\_cache**                       | `bool` | If `TRUE`, stores LLM results in cache; repeated prompts return cached responses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | `TRUE`                                                                                                      |
| **enable\_llm\_cache\_for\_entity\_extract** | `bool` | If `TRUE`, stores LLM results in cache for entity extraction; Good for beginners to debug your application                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | `TRUE`                                                                                                     |
| **addon\_params**                            | `dict` | Additional parameters, e.g., `{"example_number": 1, "language": "Simplified Chinese", "entity_types": ["organization", "person", "geo", "event"], "insert_batch_size": 10}`: sets example limit, output language, and batch size for document processing                                                                                                                                                                                                                                                                                                                                                                                                                            | `example_number: all examples, language: English, insert_batch_size: 10`                                    |
| **convert\_response\_to\_json\_func**        | `callable` | Not used                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | `convert_response_to_json`                                                                                  |
| **embedding\_cache\_config**                 | `dict` | Configuration for question-answer caching. Contains three parameters:<br>- `enabled`: Boolean value to enable/disable cache lookup functionality. When enabled, the system will check cached responses before generating new answers.<br>- `similarity_threshold`: Float value (0-1), similarity threshold. When a new question's similarity with a cached question exceeds this threshold, the cached answer will be returned directly without calling the LLM.<br>- `use_llm_check`: Boolean value to enable/disable LLM similarity verification. When enabled, LLM will be used as a secondary check to verify the similarity between questions before returning cached answers. | Default: `{"enabled": False, "similarity_threshold": 0.95, "use_llm_check": False}`                         |

### Error Handling
<details>
<summary>Click to view error handling details</summary>

The API includes comprehensive error handling:
- File not found errors (404)
- Processing errors (500)
- Supports multiple file encodings (UTF-8 and GBK)
</details>

## Evaluation
### Dataset
The dataset used in LightRAG can be downloaded from [TommyChien/UltraDomain](https://huggingface.co/datasets/TommyChien/UltraDomain).

### Generate Query
LightRAG uses the following prompt to generate high-level queries, with the corresponding code in `example/generate_query.py`.

<details>
<summary> Prompt </summary>

```python
Given the following description of a dataset:

{description}

Please identify 5 potential users who would engage with this dataset. For each user, list 5 tasks they would perform with this dataset. Then, for each (user, task) combination, generate 5 questions that require a high-level understanding of the entire dataset.

Output the results in the following structure:
- User 1: [user description]
    - Task 1: [task description]
        - Question 1:
        - Question 2:
        - Question 3:
        - Question 4:
        - Question 5:
    - Task 2: [task description]
        ...
    - Task 5: [task description]
- User 2: [user description]
    ...
- User 5: [user description]
    ...
```
</details>

### Batch Eval
To evaluate the performance of two RAG systems on high-level queries, LightRAG uses the following prompt, with the specific code available in `example/batch_eval.py`.

<details>
<summary> Prompt </summary>

```python
---Role---
You are an expert tasked with evaluating two answers to the same question based on three criteria: **Comprehensiveness**, **Diversity**, and **Empowerment**.
---Goal---
You will evaluate two answers to the same question based on three criteria: **Comprehensiveness**, **Diversity**, and **Empowerment**.

- **Comprehensiveness**: How much detail does the answer provide to cover all aspects and details of the question?
- **Diversity**: How varied and rich is the answer in providing different perspectives and insights on the question?
- **Empowerment**: How well does the answer help the reader understand and make informed judgments about the topic?

For each criterion, choose the better answer (either Answer 1 or Answer 2) and explain why. Then, select an overall winner based on these three categories.

Here is the question:
{query}

Here are the two answers:

**Answer 1:**
{answer1}

**Answer 2:**
{answer2}

Evaluate both answers using the three criteria listed above and provide detailed explanations for each criterion.

Output your evaluation in the following JSON format:

{{
    "Comprehensiveness": {{
        "Winner": "[Answer 1 or Answer 2]",
        "Explanation": "[Provide explanation here]"
    }},
    "Empowerment": {{
        "Winner": "[Answer 1 or Answer 2]",
        "Explanation": "[Provide explanation here]"
    }},
    "Overall Winner": {{
        "Winner": "[Answer 1 or Answer 2]",
        "Explanation": "[Summarize why this answer is the overall winner based on the three criteria]"
    }}
}}
```
</details>

### Overall Performance Table

|                      | **Agriculture**         |                       | **CS**                |                       | **Legal**             |                       | **Mix**               |                       |
|----------------------|-------------------------|-----------------------|-----------------------|-----------------------|-----------------------|-----------------------|-----------------------|-----------------------|
|                      | NaiveRAG                | **LightRAG**          | NaiveRAG              | **LightRAG**          | NaiveRAG              | **LightRAG**          | NaiveRAG              | **LightRAG**          |
| **Comprehensiveness** | 32.4%                  | **67.6%**             | 38.4%                | **61.6%**             | 16.4%                | **83.6%**             | 38.8%                | **61.2%**             |
| **Diversity**         | 23.6%                  | **76.4%**             | 38.0%                | **62.0%**             | 13.6%                | **86.4%**             | 32.4%                | **67.6%**             |
| **Empowerment**       | 32.4%                  | **67.6%**             | 38.8%                | **61.2%**             | 16.4%                | **83.6%**             | 42.8%                | **57.2%**             |
| **Overall**           | 32.4%                  | **67.6%**             | 38.8%                | **61.2%**             | 15.2%                | **84.8%**             | 40.0%                | **60.0%**             |
|                      | RQ-RAG                  | **LightRAG**          | RQ-RAG               | **LightRAG**          | RQ-RAG               | **LightRAG**          | RQ-RAG               | **LightRAG**          |
| **Comprehensiveness** | 31.6%                  | **68.4%**             | 38.8%                | **61.2%**             | 15.2%                | **84.8%**             | 39.2%                | **60.8%**             |
| **Diversity**         | 29.2%                  | **70.8%**             | 39.2%                | **60.8%**             | 11.6%                | **88.4%**             | 30.8%                | **69.2%**             |
| **Empowerment**       | 31.6%                  | **68.4%**             | 36.4%                | **63.6%**             | 15.2%                | **84.8%**             | 42.4%                | **57.6%**             |
| **Overall**           | 32.4%                  | **67.6%**             | 38.0%                | **62.0%**             | 14.4%                | **85.6%**             | 40.0%                | **60.0%**             |
|                      | HyDE                    | **LightRAG**          | HyDE                 | **LightRAG**          | HyDE                 | **LightRAG**          | HyDE                 | **LightRAG**          |
| **Comprehensiveness** | 26.0%                  | **74.0%**             | 41.6%                | **58.4%**             | 26.8%                | **73.2%**             | 40.4%                | **59.6%**             |
| **Diversity**         | 24.0%                  | **76.0%**             | 38.8%                | **61.2%**             | 20.0%                | **80.0%**             | 32.4%                | **67.6%**             |
| **Empowerment**       | 25.2%                  | **74.8%**             | 40.8%                | **59.2%**             | 26.0%                | **74.0%**             | 46.0%                | **54.0%**             |
| **Overall**           | 24.8%                  | **75.2%**             | 41.6%                | **58.4%**             | 26.4%                | **73.6%**             | 42.4%                | **57.6%**             |
|                      | GraphRAG                | **LightRAG**          | GraphRAG             | **LightRAG**          | GraphRAG             | **LightRAG**          | GraphRAG             | **LightRAG**          |
| **Comprehensiveness** | 45.6%                  | **54.4%**             | 48.4%                | **51.6%**             | 48.4%                | **51.6%**             | **50.4%**            | 49.6%                |
| **Diversity**         | 22.8%                  | **77.2%**             | 40.8%                | **59.2%**             | 26.4%                | **73.6%**             | 36.0%                | **64.0%**             |
| **Empowerment**       | 41.2%                  | **58.8%**             | 45.2%                | **54.8%**             | 43.6%                | **56.4%**             | **50.8%**            | 49.2%                |
| **Overall**           | 45.2%                  | **54.8%**             | 48.0%                | **52.0%**             | 47.2%                | **52.8%**             | **50.4%**            | 49.6%                |

## Reproduce
All the code can be found in the `./reproduce` directory.

### Step-0 Extract Unique Contexts
First, we need to extract unique contexts in the datasets.

<details>
<summary> Code </summary>

```python
def extract_unique_contexts(input_directory, output_directory):

    os.makedirs(output_directory, exist_ok=True)

    jsonl_files = glob.glob(os.path.join(input_directory, '*.jsonl'))
    print(f"Found {len(jsonl_files)} JSONL files.")

    for file_path in jsonl_files:
        filename = os.path.basename(file_path)
        name, ext = os.path.splitext(filename)
        output_filename = f"{name}_unique_contexts.json"
        output_path = os.path.join(output_directory, output_filename)

        unique_contexts_dict = {}

        print(f"Processing file: {filename}")

        try:
            with open(file_path, 'r', encoding='utf-8') as infile:
                for line_number, line in enumerate(infile, start=1):
                    line = line.strip()
                    if not line:
                        continue
                    try:
                        json_obj = json.loads(line)
                        context = json_obj.get('context')
                        if context and context not in unique_contexts_dict:
                            unique_contexts_dict[context] = None
                    except json.JSONDecodeError as e:
                        print(f"JSON decoding error in file {filename} at line {line_number}: {e}")
        except FileNotFoundError:
            print(f"File not found: {filename}")
            continue
        except Exception as e:
            print(f"An error occurred while processing file {filename}: {e}")
            continue

        unique_contexts_list = list(unique_contexts_dict.keys())
        print(f"There are {len(unique_contexts_list)} unique `context` entries in the file {filename}.")

        try:
            with open(output_path, 'w', encoding='utf-8') as outfile:
                json.dump(unique_contexts_list, outfile, ensure_ascii=False, indent=4)
            print(f"Unique `context` entries have been saved to: {output_filename}")
        except Exception as e:
            print(f"An error occurred while saving to the file {output_filename}: {e}")

    print("All files have been processed.")

```
</details>

### Step-1 Insert Contexts
For the extracted contexts, we insert them into the LightRAG system.

<details>
<summary> Code </summary>

```python
def insert_text(rag, file_path):
    with open(file_path, mode='r') as f:
        unique_contexts = json.load(f)

    retries = 0
    max_retries = 3
    while retries < max_retries:
        try:
            rag.insert(unique_contexts)
            break
        except Exception as e:
            retries += 1
            print(f"Insertion failed, retrying ({retries}/{max_retries}), error: {e}")
            time.sleep(10)
    if retries == max_retries:
        print("Insertion failed after exceeding the maximum number of retries")
```
</details>

### Step-2 Generate Queries

We extract tokens from the first and the second half of each context in the dataset, then combine them as dataset descriptions to generate queries.

<details>
<summary> Code </summary>

```python
tokenizer = GPT2Tokenizer.from_pretrained('gpt2')

def get_summary(context, tot_tokens=2000):
    tokens = tokenizer.tokenize(context)
    half_tokens = tot_tokens // 2

    start_tokens = tokens[1000:1000 + half_tokens]
    end_tokens = tokens[-(1000 + half_tokens):1000]

    summary_tokens = start_tokens + end_tokens
    summary = tokenizer.convert_tokens_to_string(summary_tokens)

    return summary
```
</details>

### Step-3 Query
For the queries generated in Step-2, we will extract them and query LightRAG.

<details>
<summary> Code </summary>

```python
def extract_queries(file_path):
    with open(file_path, 'r') as f:
        data = f.read()

    data = data.replace('**', '')

    queries = re.findall(r'- Question \d+: (.+)', data)

    return queries
```
</details>

## API
LightRag can be installed with API support to serve a Fast api interface to perform data upload and indexing/Rag operations/Rescan of the input folder etc..

The documentation can be found [https://github.com/ParisNeo/LightRAG/blob/main/docs/LightRagAPI.md](here)

## Star History

<a href="https://star-history.com/#HKUDS/LightRAG&Date">
 <picture>
   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=HKUDS/LightRAG&type=Date&theme=dark" />
   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/svg?repos=HKUDS/LightRAG&type=Date" />
   <img alt="Star History Chart" src="https://api.star-history.com/svg?repos=HKUDS/LightRAG&type=Date" />
 </picture>
</a>

## Contribution

Thank you to all our contributors!

<a href="https://github.com/HKUDS/LightRAG/graphs/contributors">
  <img src="https://contrib.rocks/image?repo=HKUDS/LightRAG" />
</a>

## 🌟Citation

```python
@article{guo2024lightrag,
title={LightRAG: Simple and Fast Retrieval-Augmented Generation},
author={Zirui Guo and Lianghao Xia and Yanhua Yu and Tu Ao and Chao Huang},
year={2024},
eprint={2410.05779},
archivePrefix={arXiv},
primaryClass={cs.IR}
}
```
**Thank you for your interest in our work!**
