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A Survey on Knowledge-Oriented Retrieval-Augmented Generation

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arxiv 2503.10677 v3 pith:CTM4TSVV submitted 2025-03-11 cs.CL cs.AI

classification cs.CLcs.AI
keywords generationretrievalgenerativemodelsretrieval-augmentedsystemschallengesdata
verification ladder T0 review T1 audit T2 compute T3 formal
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Retrieval-Augmented Generation (RAG) has gained significant attention in recent years for its potential to enhance natural language understanding and generation by combining large-scale retrieval systems with generative models. RAG leverages external knowledge sources, such as documents, databases, or structured data, to improve model performance and generate more accurate and contextually relevant outputs. This survey aims to provide a comprehensive overview of RAG by examining its fundamental components, including retrieval mechanisms, generation processes, and the integration between the two. We discuss the key characteristics of RAG, such as its ability to augment generative models with dynamic external knowledge, and the challenges associated with aligning retrieved information with generative objectives. We also present a taxonomy that categorizes RAG methods, ranging from basic retrieval-augmented approaches to more advanced models incorporating multimodal data and reasoning capabilities. Additionally, we review the evaluation benchmarks and datasets commonly used to assess RAG systems, along with a detailed exploration of its applications in fields such as question answering, summarization, and information retrieval. Finally, we highlight emerging research directions and opportunities for improving RAG systems, such as enhanced retrieval efficiency, model interpretability, and domain-specific adaptations. This paper concludes by outlining the prospects for RAG in addressing real-world challenges and its potential to drive further advancements in natural language processing.

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Cited by 13 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. MERIT: Efficient In-Place Deletion for Dynamic Graph-Based Approximate Nearest Neighbor Indexes

    cs.DB 2026-07 conditional novelty 6.5 of 10

    MERIT makes vector-graph deletions cheap by repairing only a bounded local neighborhood via k_r-MST and invalidating all leftover stale edges with per-target version stamps.

  2. Bridging the Question-Answer Gap in Retrieval-Augmented Generation: Hypothetical Prompt Embeddings

    cs.IR 2026-07 conditional novelty 6.0 of 10

    Precomputing hypothetical question embeddings for each text chunk at indexing time shifts retrieval to question–question matching and improves context precision and claim recall in RAG.

  3. HGMEM: Hypergraph-based Working Memory to Improve Multi-step RAG for Long-Context Complex Relational Modeling

    cs.CL 2025-12 conditional novelty 6.0 of 10

    A working memory represented as a hypergraph, whose hyperedges are updated, inserted, and progressively merged by the LLM, improves multi-step RAG on long-context sense-making benchmarks.

  4. An Agile Method for Implementing Retrieval Augmented Generation Tools in Industrial SMEs

    cs.CL 2025-08 conditional novelty 6.0 of 10

    EASI-RAG is a structured agile method for deploying RAG tools in industrial SMEs, validated by one case study where a no-experience team built a working assistant in three weeks.

  5. Healthier LLMs: Retrieval-Augmented Generation for Public Health Question Answering

    cs.CL 2026-07 conditional novelty 5.0 of 10

    Hybrid RAG over UK public health guidance sharply raises MCQA accuracy and free-form faithfulness, letting smaller open models match larger closed models without retrieval.

  6. Leveraging Multi-Agent System (MAS) and Fine-Tuned Small Language Models (SLMs) for Automated Telecom Network Troubleshooting

    cs.AI 2025-11 reject novelty 5.0 of 10

    A multi-agent LLM system with a fine-tuned small language model as solution planner claims 6× faster and 10% more accurate telecom troubleshooting, but the evidence is internal and partly circular.

  7. Atom-Searcher: Enhancing Agentic Deep Research via Fine-Grained Atomic Thought Reward

    cs.CL 2025-08 unverdicted novelty 5.0 of 10

    A new RL framework that rewards fine-grained reasoning steps, called Atomic Thoughts, claims better agentic deep research on seven benchmarks.

  8. Agent-R1: A Unified and Modular Framework for Agentic Reinforcement Learning

    cs.CL 2025-11 conditional novelty 4.0 of 10

    A modular, algorithm-agnostic framework for multi-turn agentic RL that masks policy updates to agent tokens and validates on multi-hop QA with five RL algorithms.

  9. A Survey on Open Dataset Search in the LLM Era: Retrospectives and Perspectives

    cs.IR 2025-08 conditional novelty 4.0 of 10

    A structured review of open dataset search across tabular, spatial, JSON, graph, and vector data, plus the two-way relationship with LLMs.

  10. Never Come Up Empty: Adaptive HyDE Retrieval for Improving LLM Developer Support

    cs.SE 2025-07 conditional novelty 4.0 of 10

    A HyDE retrieval pipeline with full-answer context and adaptive similarity thresholding improves LLM answers to Stack Overflow questions over zero-shot prompting for three of four open-source models.

  11. LLM Web Dynamics: Tracing Model Collapse in a Network of LLMs

    cs.LG 2025-05 conditional novelty 4.0 of 10

    Under a shared retrieval-augmented memory, multiple LLMs' outputs converge to near-identical semantic answers, and the analogous Gaussian mixture system is proven to collapse.

  12. CTRAG: An In-Context Retrieval-based Framework for Automated Compliance Checking using LLMs

    cs.CL 2026-08 reject novelty 3.0 of 10

    A RAG pipeline with tuned chunking, retrieval depth, and in-context examples reports 78% F1 for automated compliance checking, but the evaluation has no held-out validation and a post-hoc No-Evidence-to-Non-Compliant ...

  13. RACE-Align: Retrieval-Augmented and Chain-of-Thought Enhanced Preference Alignment for Large Language Models

    cs.CL 2025-06 reject novelty 3.0 of 10

    RACE-Align generates preference pairs from RAG-grounded chain-of-thought answers and applies DPO to align a 1.7B model, showing improved reasoning scores in TCM QA but lacking statistical support.

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