- [2024.10.18]🎯🎯📢📢We’ve added a link to a LightRAG Introduction Video. Thanks to the author!
- [2024.10.17]🎯🎯📢📢We have created a Discord channel! Welcome to join for sharing and discussions! 🎉🎉
- [2024.10.16]🎯🎯📢📢LightRAG now supports Ollama models!
- [2024.10.15]🎯🎯📢📢LightRAG now supports Hugging Face models!
- Install from source (Recommend)
cd LightRAG
pip install -e .- Install from PyPI
pip install lightrag-hku- 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":
curl https://raw.githubusercontent.com/gusye1234/nano-graphrag/main/tests/mock_data.txt > ./book.txtUse the below Python snippet (in a script) to initialize LightRAG and perform queries:
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"
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")))Using Open AI-like APIs
- LightRAG also supports Open AI-like chat/embeddings APIs:
async def llm_model_func(
prompt, system_prompt=None, history_messages=[], **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
)
)Using Hugging Face Models
- If you want to use Hugging Face models, you only need to set LightRAG as follows:
from lightrag.llm import hf_model_complete, hf_embedding
from transformers import AutoModel, AutoTokenizer
# 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")
)
),
)Using Ollama Models
- If you want to use Ollama models, you only need to set LightRAG as follows:
from lightrag.llm import ollama_model_complete, ollama_embedding
# 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 the
num_ctxparameter:
- Pull the model:
ollama pull qwen2- Display the model file:
ollama show --modelfile qwen2 > Modelfile- Edit the Modelfile by adding the following line:
PARAMETER num_ctx 32768- Create the modified model:
ollama create -f Modelfile qwen2m# Batch Insert: Insert multiple texts at once
rag.insert(["TEXT1", "TEXT2",...])# Incremental Insert: Insert new documents into an existing LightRAG instance
rag = LightRAG(working_dir="./dickens")
with open("./newText.txt") as f:
rag.insert(f.read())The dataset used in LightRAG can be downloaded from TommyChien/UltraDomain.
LightRAG uses the following prompt to generate high-level queries, with the corresponding code in example/generate_query.py.
Prompt
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]
...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.
Prompt
---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]"
}}
}}| Agriculture | CS | Legal | Mix | |||||
|---|---|---|---|---|---|---|---|---|
| NaiveRAG | LightRAG | NaiveRAG | LightRAG | NaiveRAG | LightRAG | NaiveRAG | LightRAG | |
| Comprehensiveness | 32.69% | 67.31% | 35.44% | 64.56% | 19.05% | 80.95% | 36.36% | 63.64% |
| Diversity | 24.09% | 75.91% | 35.24% | 64.76% | 10.98% | 89.02% | 30.76% | 69.24% |
| Empowerment | 31.35% | 68.65% | 35.48% | 64.52% | 17.59% | 82.41% | 40.95% | 59.05% |
| Overall | 33.30% | 66.70% | 34.76% | 65.24% | 17.46% | 82.54% | 37.59% | 62.40% |
| RQ-RAG | LightRAG | RQ-RAG | LightRAG | RQ-RAG | LightRAG | RQ-RAG | LightRAG | |
| Comprehensiveness | 32.05% | 67.95% | 39.30% | 60.70% | 18.57% | 81.43% | 38.89% | 61.11% |
| Diversity | 29.44% | 70.56% | 38.71% | 61.29% | 15.14% | 84.86% | 28.50% | 71.50% |
| Empowerment | 32.51% | 67.49% | 37.52% | 62.48% | 17.80% | 82.20% | 43.96% | 56.04% |
| Overall | 33.29% | 66.71% | 39.03% | 60.97% | 17.80% | 82.20% | 39.61% | 60.39% |
| HyDE | LightRAG | HyDE | LightRAG | HyDE | LightRAG | HyDE | LightRAG | |
| Comprehensiveness | 24.39% | 75.61% | 36.49% | 63.51% | 27.68% | 72.32% | 42.17% | 57.83% |
| Diversity | 24.96% | 75.34% | 37.41% | 62.59% | 18.79% | 81.21% | 30.88% | 69.12% |
| Empowerment | 24.89% | 75.11% | 34.99% | 65.01% | 26.99% | 73.01% | 45.61% | 54.39% |
| Overall | 23.17% | 76.83% | 35.67% | 64.33% | 27.68% | 72.32% | 42.72% | 57.28% |
| GraphRAG | LightRAG | GraphRAG | LightRAG | GraphRAG | LightRAG | GraphRAG | LightRAG | |
| Comprehensiveness | 45.56% | 54.44% | 45.98% | 54.02% | 47.13% | 52.87% | 51.86% | 48.14% |
| Diversity | 19.65% | 80.35% | 39.64% | 60.36% | 25.55% | 74.45% | 35.87% | 64.13% |
| Empowerment | 36.69% | 63.31% | 45.09% | 54.91% | 42.81% | 57.19% | 52.94% | 47.06% |
| Overall | 43.62% | 56.38% | 45.98% | 54.02% | 45.70% | 54.30% | 51.86% | 48.14% |
All the code can be found in the ./reproduce directory.
First, we need to extract unique contexts in the datasets.
Code
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.")For the extracted contexts, we insert them into the LightRAG system.
Code
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")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.
Code
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 summaryFor the queries generated in Step-2, we will extract them and query LightRAG.
Code
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.
├── examples
│ ├── batch_eval.py
│ ├── generate_query.py
│ ├── lightrag_azure_openai_demo.py
│ ├── lightrag_bedrock_demo.py
│ ├── lightrag_hf_demo.py
│ ├── lightrag_ollama_demo.py
│ ├── lightrag_openai_compatible_demo.py
│ └── lightrag_openai_demo.py
├── lightrag
│ ├── __init__.py
│ ├── base.py
│ ├── lightrag.py
│ ├── llm.py
│ ├── operate.py
│ ├── prompt.py
│ ├── storage.py
│ └── utils.py
├── reproduce
│ ├── Step_0.py
│ ├── Step_1.py
│ ├── Step_2.py
│ └── Step_3.py
├── .gitignore
├── .pre-commit-config.yaml
├── LICENSE
├── README.md
├── requirements.txt
└── setup.py@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}
}