---
title: "DRAGIN — paper by Su et al. (2024) — summary and ideas"
description: "DRAGIN replaces both choices with two signals taken from the model itself: RIND decides when to… 46 references, cited by 61 papers here."
authors: ["Weihang Su", "Yichen Tang", "Qingyao Ai", "Zhijing Wu", "Yiqun Liu"]
year: 2024
venue: "Proceedings of the 62nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)"
source: "https://aclanthology.org/2024.acl-long.702/"
doi: "10.18653/v1/2024.acl-long.702"
licence: "CC BY 4.0 (ACL Anthology)"
licence_url: "https://creativecommons.org/licenses/by/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/su-2024-dragin-dynamic-retrieval-augmented-generation/"
---
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# DRAGIN: Dynamic Retrieval Augmented Generation based on the Real-time Information Needs of Large Language Models

**Authors:** [Weihang Su](https://md.research.elamur.ai/free/en/authors/weihang-su/), Yichen Tang, [Qingyao Ai](https://md.research.elamur.ai/free/en/authors/qingyao-ai/), [Zhijing Wu](https://md.research.elamur.ai/free/en/authors/zhijing-wu/) and [Yiqun Liu](https://md.research.elamur.ai/free/en/authors/yiqun-liu/) · **Year:** 2024 · **Venue:** [Proceedings of the 62nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)](https://md.research.elamur.ai/free/en/venues/acl/) ([ACL 2024](https://md.research.elamur.ai/free/en/venues/acl/2024/)) · **Publisher:** [Association for Computational Linguistics](https://md.research.elamur.ai/free/en/publishers/association-for-computational-linguistics/) · **Licence:** [CC BY 4.0 (ACL Anthology)](https://creativecommons.org/licenses/by/4.0/)

**Links:** [Publisher's page](https://aclanthology.org/2024.acl-long.702/) · [PDF](https://aclanthology.org/2024.acl-long.702.pdf) · [DOI 10.18653/v1/2024.acl-long.702](https://doi.org/10.18653/v1/2024.acl-long.702) · [OpenAlex](https://openalex.org/W4402671152)

**Citations:** 76 citations (OpenAlex, 2026-10-14) · [61](https://md.research.elamur.ai/free/en/papers/su-2024-dragin-dynamic-retrieval-augmented-generation/cited-by/) in our library, of the 141,840 papers whose bibliographies we read

## Summary
Dynamic retrieval-augmented generation lets an LLM fetch external documents several times while it writes. Each step must settle two questions: when retrieval should fire and what query to send. The authors argue that earlier systems answer both poorly. They trigger retrieval on fixed schedules, such as every sentence or every few tokens, and they build queries only from the latest sentence or the last tokens.

DRAGIN replaces both choices with two signals taken from the model itself:
- **RIND** decides when to retrieve. It scores each generated token using three factors: entropy-based uncertainty, the strongest attention later tokens pay to it, and whether it carries meaning.
- **QFS** decides what to retrieve. It uses self-attention over the whole context to pick the tokens that best express the model's current knowledge gap.

The framework works with any Transformer LLM and needs no training, fine-tuning or prompt design. On four knowledge-intensive benchmarks with three LLMs, DRAGIN beat existing dynamic RAG methods on every dataset. This shows that the model's internal states are a useful guide for adaptive retrieval.

## Key points
- **Benchmarks:** four knowledge-intensive generation datasets, including HotpotQA, 2WikiMultihopQA and IIRC. Three LLMs were tested, among them LLaMA2-13B-Chat.
- **Query formulation ablation:** retrieval timing was fixed to RIND, and the LLaMA2-13B-Chat setting was compared. QFS reached EM 0.314, ahead of FLARE (0.262), full context (0.252), FS-RAG (0.255) and FL-RAG (0.241). Using the full context as the query did not help, which points to redundancy in it.
- **Threshold sensitivity:** on HotpotQA, results stayed stable across different RIND threshold values. A higher threshold reduces how often retrieval fires, which lets users trade accuracy against speed.
- **Retriever comparison:** with LLaMA2-13B-Chat, lexical BM25 outperformed dense SGPT on all three tested datasets. For example, HotpotQA EM was 0.314 vs 0.264.
- **Limitation and availability:** the method requires access to attention scores, so it cannot run on closed APIs. Code, data and models are released at github.com/oneal2000/DRAGIN.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

## Institutions

- [Tsinghua University](https://md.research.elamur.ai/free/en/universities/tsinghua-university/) — University, Beijing, China · 137 works · 83,262 citations

📚 Shelves (5): [🖥️ Computer Science](https://md.research.elamur.ai/free/en/shelves/computer-science/) · 9,085 works · [🤖 Artificial Intelligence](https://md.research.elamur.ai/free/en/shelves/computer-science/artificial-intelligence/) · 8,888 works · [🎭 Arts and Humanities](https://md.research.elamur.ai/free/en/shelves/arts-and-humanities/) · 9,296 works · [🗣️ Language and Linguistics](https://md.research.elamur.ai/free/en/shelves/arts-and-humanities/language-and-linguistics/) · 9,206 works · [🗄️ Information Systems](https://md.research.elamur.ai/free/en/shelves/computer-science/information-systems/) · 523 works

🧭 Topics (2): [🧠 Language models & pretraining](https://md.research.elamur.ai/free/en/topics/language-models/) · 1,344 works · [🔍 Information retrieval & search](https://md.research.elamur.ai/free/en/topics/information-retrieval/) · 146 works

## Cite

Cite as: Weihang Su, Yichen Tang, Qingyao Ai, Zhijing Wu and Yiqun Liu. 2024. DRAGIN: Dynamic Retrieval Augmented Generation based on the Real-time Information Needs of Large Language Models. Proceedings of the 62nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers).

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@inproceedings{su2024dragin,
  title = {{DRAGIN: Dynamic Retrieval Augmented Generation based on the Real-time Information Needs of Large Language Models}},
  author = {Weihang Su, Yichen Tang, Qingyao Ai, Zhijing Wu and Yiqun Liu},
  booktitle = {Proceedings of the 62nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)},
  year = {2024},
  doi = {10.18653/v1/2024.acl-long.702},
  url = {https://doi.org/10.18653/v1/2024.acl-long.702}
}
```

- [← previous LongRoPE: Extending LLM Context Window Beyond 2 Million Tokens](https://md.research.elamur.ai/free/en/papers/ding-2024-longrope-extending-llm-context/)
- [next → Investigating Data Contamination in Modern Benchmarks for Large Language Models](https://md.research.elamur.ai/free/en/papers/deng-2024-investigating-data-contamination-modern-benchmarks/)
- [↑ back to papers of 2024](https://md.research.elamur.ai/free/en/papers/2024/page/2/)

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*Updated 24 October 2026*