ragflow/docs/guides/configure_knowledge_base/construct_knowledge_graph.md

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Construct knowledge graph

Generate a knowledge graph for your knowledge base.

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To enhance multi-hop question-answering, RAGFlow adds a knowledge graph construction step between data extraction and indexing, as illustrated below. This step creates additional chunks from existing ones generated by your specified chunk method.

As of v0.16.0, RAGFlow supports constructing a knowledge graph on a knowledge base, allowing you to construct a unified graph across multiple files within your knowledge base. When a newly uploaded file starts parsing, the generated graph will automatically update.

:::danger WARNING Constructing a knowledge graph requires significant memory, computational resources, and tokens. :::

Scenarios

Knowledge graphs are especially useful for multi-hop question-answering involving nested logic. They outperform traditional extraction approaches when you are performing question answering on books or works with complex entities and relationships.

Prerequisites

The system’s default chat model is used to generate knowledge graph. Before proceeding, ensure that you have an chat model properly configured:

Configurations

Entity types (Required)

The types of the entities to extract from your knowledge base. The default types are: organization, person, event, and category. Add or remove types to suit your specific knowledge base.

Method

The method to use to construct knowledge graph:

• General: Use prompts provided by GraphRAG to extract entities and relationships.
• Light: (Default) Use prompts provided by LightRAG to extract entities and relationships. This option consumes fewer tokens, less memory, and fewer computational resources.

Entity resolution

Whether to enable entity resolution. You can think of this as an entity deduplication switch. When enabled, the LLM will combine similar entities - e.g., ‘2025’ and ‘the year of 2025’, or ‘IT’ and ‘Information Technology’ - to construct a more accurate graph.

• (Default) Disable entity resolution. This option consumes fewer tokens.
• Enable entity resolution.

Community report generation

In a knowledge graph, a community is a cluster of entities linked by relationships. You can have the LLM generate an abstract for each community, known as a community report. See here for more information. This indicates whether to generate community reports:

• Generate community reports.
• (Default) Do not generate community reports. This options consumes fewer tokens.

Procedure

1. On the Configuration page of your knowledge base, switch on Extract knowledge graph or adjust its settings as needed, and click Save to confirm your changes.

   • The default GraphRAG configurations for your knowlege base are now set and files uploaded from this point onward will automatically use these settings during parsing.
   • Files parsed before this update will retain their original knowledge graph settings.

2. The knowledge graph of your knowlege base does not automatically update until a newly uploaded file is parsed.

A Knowledge Graph entry appears under Configuration once a knowledge graph is created.

1. Click Knowledge Graph to view the details of the generated graph.

Frequently asked questions

Can I have different knowledge graph settings for different files in my knowledge base?

Yes, you can. Just one graph is generated per knowledge base. The smaller graphs of your files will be combined into one big, unified graph at the end of the graph extraction process.