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sidebar_position: 1
slug: /construct_knowledge_graph
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---
# Construct knowledge graph

Generate a knowledge graph for your dataset.

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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 chunking method.

![Image](https://github.com/user-attachments/assets/1ec21d8e-f255-4d65-9918-69b72dfa142b)

From v0.16.0 onward, RAGFlow supports constructing a knowledge graph on a dataset, allowing you to construct a *unified* graph across multiple files within your dataset. 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.

:::tip NOTE
RAPTOR (Recursive Abstractive Processing for Tree Organized Retrieval) can also be used for multi-hop question-answering tasks. See [Enable RAPTOR](./enable_raptor.md) for details. You may use either approach or both, but ensure you understand the memory, computational, and token costs involved.
:::

## Prerequisites

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

![Set default models](https://raw.githubusercontent.com/infiniflow/ragflow-docs/main/images/set_default_models.jpg)

## Configurations

### Entity types (*Required*)

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

### Method

The method to use to construct knowledge graph:

- **General**: Use prompts provided by [GraphRAG](https://github.com/microsoft/graphrag) to extract entities and relationships.
- **Light**: (Default) Use prompts provided by [LightRAG](https://github.com/HKUDS/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 effective graph.

- (Default) Disable entity resolution.
- Enable entity resolution. This option consumes more tokens.

### Community reports

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](https://www.microsoft.com/en-us/research/blog/graphrag-improving-global-search-via-dynamic-community-selection/) for more information. This indicates whether to generate community reports:

- Generate community reports. This option consumes more tokens.
- (Default) Do not generate community reports.

## Quickstart

1. Navigate to the **Configuration** page of your dataset and update:
   
   - Entity types: *Required* - Specifies the entity types in the knowledge graph to generate. You don't have to stick with the default, but you need to customize them for your documents.
   - Method: *Optional*
   - Entity resolution: *Optional*
   - Community reports: *Optional*
   *The default knowledge graph configurations for your dataset are now set.*

2. Navigate to the **Files** page of your dataset, click the **Generate** button on the top right corner of the page, then select **Knowledge graph** from the dropdown to initiate the knowledge graph generation process.

   *You can click the pause button in the dropdown to halt the build process when necessary.*

3. Go back to the **Configuration** page:  
   
   *Once a knowledge graph is generated, the **Knowledge graph** field changes from `Not generated` to `Generated at a specific timestamp`. You can delete it by clicking the recycle bin button to the right of the field.*

4. To use the created knowledge graph, do either of the following:
   
   - In the **Chat setting** panel of your chat app, switch on the **Use knowledge graph** toggle.
   - If you are using an agent, click the **Retrieval** agent component to specify the dataset(s) and switch on the **Use knowledge graph** toggle.

## Frequently asked questions

### Does the knowledge graph automatically update when I remove a related file?

Nope. The knowledge graph does *not* update *until* you regenerate a knowledge graph for your dataset.

### How to remove a generated knowledge graph?

On the **Configuration** page of your dataset, find the **Knowledge graph** field and click the recycle bin button to the right of the field.

### Where is the created knowledge graph stored?

All chunks of the created knowledge graph are stored in RAGFlow's document engine: either Elasticsearch or [Infinity](https://github.com/infiniflow/infinity).

### How to export a created knowledge graph?

Nope. Exporting a created knowledge graph is not supported. If you still consider this feature essential, please [raise an issue](https://github.com/infiniflow/ragflow/issues) explaining your use case and its importance.