kg-gen 0.2.3

Extract a knowledge graph using LLMs from any text or messages array

kg-gen: Knowledge Graph Generation from Any Text

Welcome! kg-gen helps you extract knowledge graphs from any plain text using AI. It can process both small and large text inputs, and it can also handle messages in a conversation format.

Why generate knowledge graphs? kg-gen is great if you want to:

• Create a graph to assist with RAG (Retrieval-Augmented Generation)
• Create graph synthetic data for model training and testing
• Structure any text into a graph
• Analyze the relationships between concepts in your source text

We support API-based and local model providers via LiteLLM, including OpenAI, Ollama, Anthropic, Gemini, Deepseek, and others. We also use DSPy for structured output generation.

• Try it out by running the scripts in tests/.
• Instructions to run our KG benchmark MINE are in MINE/.
• Read the paper: KGGen: Extracting Knowledge Graphs from Plain Text with Language Models

Powered by a model of your choice

Pass in a model string to use a model of your choice. Model calls are routed via LiteLLM, and usually LiteLLM goes by the format of {model_provider}/{model_name}. See specifically how to format it at https://docs.litellm.ai/docs/providers.

Examples of models you can pass in:

• openai/gpt-4o
• gemini/gemini-2.0-flash
• ollama_chat/deepseek-r1:14b

You may specify a custom API base url with base_url (example here).

Quick start

Install the module:

pip install kg-gen

Then import and use kg-gen. You can provide your text input in one of two formats:

1. A single string
2. A list of Message objects (each with a role and content)

Below are some example snippets:

from kg_gen import KGGen

# Initialize KGGen with optional configuration
kg = KGGen(
  model="openai/gpt-4o",  # Default model
  temperature=0.0,        # Default temperature
  api_key="YOUR_API_KEY"  # Optional if set in environment or using a local model
)

# EXAMPLE 1: Single string with context
text_input = "Linda is Josh's mother. Ben is Josh's brother. Andrew is Josh's father."
graph_1 = kg.generate(
  input_data=text_input,
  context="Family relationships"
)
# Output: 
# entities={'Linda', 'Ben', 'Andrew', 'Josh'} 
# edges={'is brother of', 'is father of', 'is mother of'} 
# relations={('Ben', 'is brother of', 'Josh'), 
#           ('Andrew', 'is father of', 'Josh'), 
#           ('Linda', 'is mother of', 'Josh')}

Visualizing KG's

KGGen.visualize(graph, output_path, open_in_browser=True)

More Examples - chunking, clustering, passing in a messages array

# EXAMPLE 2: Large text with chunking and clustering
with open('large_text.txt', 'r') as f:
  large_text = f.read()
  
# Example input text:
# """
# Neural networks are a type of machine learning model. Deep learning is a subset of machine learning
# that uses multiple layers of neural networks. Supervised learning requires training data to learn
# patterns. Machine learning is a type of AI technology that enables computers to learn from data.
# AI, also known as artificial intelligence, is related to the broader field of artificial intelligence.
# Neural nets (NN) are commonly used in ML applications. Machine learning (ML) has revolutionized
# many fields of study.
# ...
# """

graph_2 = kg.generate(
  input_data=large_text,
  chunk_size=5000,  # Process text in chunks of 5000 chars
  cluster=True      # Cluster similar entities and relations
)
# Output:
# entities={'neural networks', 'deep learning', 'machine learning', 'AI', 'artificial intelligence', 
#          'supervised learning', 'unsupervised learning', 'training data', ...} 
# edges={'is type of', 'requires', 'is subset of', 'uses', 'is related to', ...} 
# relations={('neural networks', 'is type of', 'machine learning'),
#           ('deep learning', 'is subset of', 'machine learning'),
#           ('supervised learning', 'requires', 'training data'),
#           ('machine learning', 'is type of', 'AI'),
#           ('AI', 'is related to', 'artificial intelligence'), ...}
# entity_clusters={
#   'artificial intelligence': {'AI', 'artificial intelligence'},
#   'machine learning': {'machine learning', 'ML'},
#   'neural networks': {'neural networks', 'neural nets', 'NN'}
#   ...
# }
# edge_clusters={
#   'is type of': {'is type of', 'is a type of', 'is a kind of'},
#   'is related to': {'is related to', 'is connected to', 'is associated with'
#  ...}
# }

# EXAMPLE 3: Messages array
messages = [
  {"role": "user", "content": "What is the capital of France?"}, 
  {"role": "assistant", "content": "The capital of France is Paris."}
]
graph_3 = kg.generate(input_data=messages)
# Output: 
# entities={'Paris', 'France'} 
# edges={'has capital'} 
# relations={('France', 'has capital', 'Paris')}

# EXAMPLE 4: Combining multiple graphs
text1 = "Linda is Joe's mother. Ben is Joe's brother."

# Input text 2: also goes by Joe."
text2 = "Andrew is Joseph's father. Judy is Andrew's sister. Joseph also goes by Joe."

graph4_a = kg.generate(input_data=text1)
graph4_b = kg.generate(input_data=text2)

# Combine the graphs
combined_graph = kg.aggregate([graph4_a, graph4_b])

# Optionally cluster the combined graph
clustered_graph = kg.cluster(
  combined_graph,
  context="Family relationships"
)
# Output:
# entities={'Linda', 'Ben', 'Andrew', 'Joe', 'Joseph', 'Judy'} 
# edges={'is mother of', 'is father of', 'is brother of', 'is sister of'} 
# relations={('Linda', 'is mother of', 'Joe'),
#           ('Ben', 'is brother of', 'Joe'),
#           ('Andrew', 'is father of', 'Joe'),
#           ('Judy', 'is sister of', 'Andrew')}
# entity_clusters={
#   'Joe': {'Joe', 'Joseph'},
#   ...
# }
# edge_clusters={ ... }

Install from this repository:

Clone this repository and install dependencies using pip install -e '.[dev]'.

You may verify that it works by running python tests/test_basic.py from the root directory. This will also generate a nice visualization in tests/test_basic.html.

Features

Chunking Large Texts

For large texts, you can specify a chunk_size parameter to process the text in smaller chunks:

graph = kg.generate(
  input_data=large_text,
  chunk_size=5000  # Process in chunks of 5000 characters
)

Clustering Similar Entities and Relations

You can cluster similar entities and relations either during generation or afterwards:

# During generation
graph = kg.generate(
  input_data=text,
  cluster=True,
  context="Optional context to guide clustering"
)

# Or after generation
clustered_graph = kg.cluster(
  graph,
  context="Optional context to guide clustering"
)

Aggregating Multiple Graphs

You can combine multiple graphs using the aggregate method:

graph1 = kg.generate(input_data=text1)
graph2 = kg.generate(input_data=text2)
combined_graph = kg.aggregate([graph1, graph2])

Message Array Processing

When processing message arrays, kg-gen:

1. Preserves the role information from each message
2. Maintains message order and boundaries
3. Can extract entities and relationships:
   • Between concepts mentioned in messages
   • Between speakers (roles) and concepts
   • Across multiple messages in a conversation

For example, given this conversation:

messages = [
  {"role": "user", "content": "What is the capital of France?"},
  {"role": "assistant", "content": "The capital of France is Paris."}
]

The generated graph might include entities like:

• "user"
• "assistant"
• "France"
• "Paris"

And relations like:

• (user, "asks about", "France")
• (assistant, "states", "Paris")
• (Paris, "is capital of", "France")

API Reference

KGGen Class

Constructor Parameters

• model: str = "openai/gpt-4o" - The model to use for generation
• temperature: float = 0.0 - Temperature for model sampling
• api_key: Optional[str] = None - API key for model access

generate() Method Parameters

• input_data: Union[str, List[Dict]] - Text string or list of message dicts
• model: Optional[str] - Override the default model
• api_key: Optional[str] - Override the default API key
• context: str = "" - Description of data context
• chunk_size: Optional[int] - Size of text chunks to process
• cluster: bool = False - Whether to cluster the graph after generation
• temperature: Optional[float] - Override the default temperature
• output_folder: Optional[str] - Path to save partial progress

cluster() Method Parameters

• graph: Graph - The graph to cluster
• context: str = "" - Description of data context
• model: Optional[str] - Override the default model
• temperature: Optional[float] - Override the default temperature
• api_key: Optional[str] - Override the default API key

aggregate() Method Parameters

• graphs: List[Graph] - List of graphs to combine

License

The MIT License.