AI summary · arXiv: 2501.00309v1 · cs.IR

Retrieval-Augmented Generation with Graphs (GraphRAG)

Haoyu Han, Yu Wang, Harry Shomer, Kai Guo, Jiayuan Ding, Yongjia Lei, Mahantesh Halappanavar, Ryan A. Rossi,
and 10 more authorsSubhabrata Mukherjee, Xianfeng Tang, Qi He, Zhigang Hua, Bo Long, Tong Zhao, Neil Shah, Amin Javari, Yinglong Xia, Jiliang Tang
Original paper Submitted to arXiv on 31 Dec. 2024 License: NONEXCLUSIVE-DISTRIB 1.0

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  • Retrieval-augmented generation (RAG) boosts downstream task performance by incorporating information from external sources like knowledge bases, skills, and tools.
  • Graph structures are rich sources of heterogeneous and relational data that enhance RAG in real-world applications.
  • GraphRAG integrates graphs into RAG to revolutionize information retrieval and generation processes.
  • Challenges in implementing GraphRAG stem from diverse formats and domain-specific relational knowledge within graph structures.
  • A comprehensive survey on GraphRAG outlines essential components: query processor, retriever, organizer, generator, and data source; reviews specialized techniques for different domains; addresses research challenges; and proposes future directions.
  • The authors have made their survey repository publicly accessible at https://github.com/Graph-RAG/GraphRAG/, offering a valuable resource for researchers exploring the evolving landscape of GraphRAG applications.

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AI-generated keywords: Retrieval-augmented generation

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, , , , Retrieval-augmented generation (RAG) is a cutting-edge technique that significantly boosts the performance of downstream tasks by incorporating additional information retrieved from external sources, such as knowledge bases, skills, and tools. Graph structures, with their inherent "nodes connected by edges" nature, serve as a rich source of heterogeneous and relational data, making them invaluable for enhancing RAG in various real-world applications. The integration of graphs into RAG, known as GraphRAG, has garnered increasing attention due to its potential to revolutionize information retrieval and generation processes. However, unlike traditional RAG approaches where the retriever, generator, and external data sources can be seamlessly designed in a neural-embedding space, the unique characteristics of graph-structured data present novel challenges when implementing GraphRAG across different domains. These challenges stem from the diverse formats and domain-specific relational knowledge encapsulated within graph structures. To address these complexities and capitalize on the broad applicability of GraphRAG, there is a pressing need for a systematic and up-to-date survey that delves into its key concepts and techniques. In response to this demand, a comprehensive survey on GraphRAG has been presented. The survey introduces a holistic framework for GraphRAG by outlining its essential components: query processor, retriever, organizer, generator, and data source. Recognizing that graphs in distinct domains exhibit unique relational patterns necessitating tailored designs; the survey reviews specialized GraphRAG techniques customized for each domain. Additionally, the survey sheds light on research challenges and proposes future directions to foster cross-disciplinary collaborations. The authors have made their survey repository publicly accessible at https://github.com/Graph-RAG/GraphRAG/, providing a valuable resource for researchers interested in exploring the evolving landscape of GraphRAG applications and methodologies. This detailed summary encapsulates the significance of integrating graph structures into retrieval-augmented generation processes while highlighting the complexities and opportunities associated with designing effective GraphRAG solutions across diverse domains.

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    A Survey on Graph-Based Retrieval-Augmented Generation: Architectures, Methods, and Applications
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    A Survey on Graph-Based Retrieval-Augmented Generation reviews Graph-RAG architectures, methods, and applications, alongside this paper’s survey of GraphRAG concepts and domain-specific techniques.

    Abstract

    Retrieval-Augmented Generation (RAG) stands out as a promising paradigm that can be applied to improve large language models by serving text generation with external sources of knowledge. Nevertheless, traditional RAG models are mostly based on flat text corpora and similarity-based retrieval and thus are not able to realize intricate relations, multi-hop dependencies, and structured semantics. The survey provides a high-level introduction to graph-based Retrieval-Augmented Generation (Graph-RAG), which is an emerging methodology adding systematic knowledge representations to the retrieval and generation process. Graph-RAG supports relational knowledge reasoning, contextual cohesion and expl…

  2. Very close Builds on this paper Cites this paper
    RAG vs. GraphRAG: A Systematic Evaluation and Key Insights
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    RAG vs. GraphRAG evaluates text-based RAG and GraphRAG systems and cites this survey.

    Abstract

    Retrieval-Augmented Generation (RAG) improves large language models (LLMs) by retrieving relevant information from external sources and has been widely adopted for text-based tasks. For structured data, such as knowledge graphs, Graph Retrieval-Augmented Generation (GraphRAG) retrieves and aggregates information along graph structures. More recently, GraphRAG has been extended to general text settings by organizing unstructured text into graph representations, showing promise for reasoning and grounding. Despite these advances, existing GraphRAG systems for text data are often tailored to specific tasks, datasets, and system designs, resulting in heterogeneous evaluation protocols. Consequen…

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    Abstract

    Graph retrieval-augmented generation (GraphRAG) has emerged as a powerful paradigm for enhancing large language models (LLMs) with external knowledge. It leverages graphs to model the hierarchical structure between specific concepts, enabling more coherent and effective knowledge retrieval for accurate reasoning.Despite its conceptual promise, recent studies report that GraphRAG frequently underperforms vanilla RAG on many real-world tasks. This raises a critical question: Is GraphRAG really effective, and in which scenarios do graph structures provide measurable benefits for RAG systems? To address this, we propose GraphRAG-Bench, a comprehensive benchmark designed to evaluate GraphRAG mode…

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    Abstract

    Recently, Retrieval-Augmented Generation (RAG) has achieved remarkable success in addressing the challenges of Large Language Models (LLMs) without necessitating retraining. By referencing an external knowledge base, RAG refines LLM outputs, effectively mitigating issues such as “hallucination,” lack of domain-specific knowledge, and outdated information. However, the complex structure of relationships among different entities in databases presents challenges for RAG systems. In response, GraphRAG leverages structural information across entities to enable more precise and comprehensive retrieval, capturing relational knowledge and facilitating more accurate, context-aware responses. Given th…

  5. Very close Another approach to the problem
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    Abstract

    Naive Retrieval-Augmented Generation (RAG) focuses on individual documents during retrieval and, as a result, falls short in handling networked documents which are very popular in many applications such as citation graphs, social media, and knowledge graphs. To overcome this limitation, we introduce Graph Retrieval-Augmented Generation (GRAG), which tackles the fundamental challenges in retrieving textual subgraphs and integrating the joint textual and topological information into Large Language Models (LLMs) to enhance its generation. To enable efficient textual subgraph retrieval, we propose a novel divide-and-conquer strategy that retrieves the optimal subgraph structure in linear time. T…

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    Abstract

    Retrieval Augmented Generation (RAG) has emerged as a solution to enhance large language models (LLMs) and avoid hallucination by grounding their answers in external data. However, traditional RAG systems struggle to capture relationships and cross-references between different sources unless explicitly mentioned. This challenge is common in real-world scenarios, where information is often distributed and interlinked, making graphs a more effective representation. Recent research has focused on using GraphRAG systems that retrieve subgraphs instead of isolated passages, improving both interpretability and retrieval precision. Our work provides a technical contribution through a comparative ev…

  7. Very close Broader context
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    Abstract

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    Abstract

    While Retrieval-Augmented Generation (RAG) methods commonly draw information from unstructured documents, the emerging paradigm of GraphRAG aims to leverage structured data such as knowledge graphs. Most existing GraphRAG efforts focus on Resource Description Framework (RDF) knowledge graphs, relying on triple representations and SPARQL queries. However, the potential of Cypher and Labeled Property Graph (LPG) databases to serve as scalable and effective reasoning engines within GraphRAG pipelines remains underexplored in current research literature. To fill this gap, we propose Multi-Agent GraphRAG, a modular LLM agentic system for text-to-Cypher query generation serving as a natural langua…

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    GraphRAG advances retrieval-augmented generation (RAG) by structuring external knowledge as multi-scale knowledge graphs, enabling language models to integrate both broad context and granular details in their generation. While GraphRAG has demonstrated success across domains, its security implications remain largely unexplored. To bridge this gap, this work examines GraphRAG's vulnerability to poisoning attacks, uncovering an intriguing security paradox: existing RAG poisoning attacks are less effective under GraphRAG than conventional RAG, due to GraphRAG's graph-based indexing and retrieval; yet, the same features also create new attack surfaces. We present GragPoison, a novel attack that …

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