---
title: "Source-Aware Training Enables Knowledge Attribution in"
description: "The authors propose a two-step recipe called source-aware training. 56 references, cited by 20 papers here."
authors: ["Muhammad Khalifa", "David Wadden", "Emma Strubell", "Honglak Lee", "Lu Wang", "Iz Beltagy", "Hao Peng"]
year: 2024
venue: "arXiv:2404.01019"
source: "https://arxiv.org/abs/2404.01019"
doi: "10.48550/arxiv.2404.01019"
arxiv: "2404.01019"
licence: "CC BY 4.0 (arXiv)"
licence_url: "http://creativecommons.org/licenses/by/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/khalifa-2024-source-aware-training-enables-knowledge/"
---
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# Source-Aware Training Enables Knowledge Attribution in Language Models

**Authors:** [Muhammad Khalifa](https://md.research.elamur.ai/free/en/authors/muhammad-khalifa/), [David Wadden](https://md.research.elamur.ai/free/en/authors/david-wadden/), [Emma Strubell](https://md.research.elamur.ai/free/en/authors/emma-strubell/), [Honglak Lee](https://md.research.elamur.ai/free/en/authors/honglak-lee/), [Lu Wang](https://md.research.elamur.ai/free/en/authors/lu-wang/), [Iz Beltagy](https://md.research.elamur.ai/free/en/authors/iz-beltagy/) and [Hao Peng](https://md.research.elamur.ai/free/en/authors/hao-peng/) · **Year:** 2024 · **Venue:** arXiv:2404.01019 · **Licence:** [CC BY 4.0 (arXiv)](http://creativecommons.org/licenses/by/4.0/)

**Links:** [Publisher's page](https://arxiv.org/abs/2404.01019) · [PDF](https://arxiv.org/pdf/2404.01019) · [DOI 10.48550/arxiv.2404.01019](https://doi.org/10.48550/arxiv.2404.01019) · [arXiv 2404.01019](https://arxiv.org/abs/2404.01019) · [OpenAlex](https://openalex.org/W4393733730)

**Citations:** 1 citations (OpenAlex, 2026-10-14) · [20](https://md.research.elamur.ai/free/en/papers/khalifa-2024-source-aware-training-enables-knowledge/cited-by/) in our library, of the 149,439 papers whose bibliographies we read

## Summary
LLMs absorb large amounts of factual knowledge during pretraining but cannot say which documents it came from. This paper studies *intrinsic source citation*: the model itself names the pretraining document behind its answer, without retrieval or post-hoc evidence search. The authors propose a two-step recipe called source-aware training. First, an off-the-shelf model is continually pretrained on a corpus in which every document carries a unique identifier. Second, the model is instruction-tuned to answer questions and output the identifier of a supporting document. Instruction tuning uses only part of the corpus (in-domain), and attribution is tested on documents seen only during pretraining (out-of-domain).

Experiments use BioCite, a synthetic corpus of fictitious biographies. The model can attribute out-of-domain knowledge reasonably well, with little perplexity cost compared to ordinary pretraining. This only works when documents are augmented by shuffling their facts into several versions. The work is a small-scale proof of concept. It points toward more verifiable and transparent LLMs and toward better ways to audit pretraining data.

## Key points
- **Identifiers and injection:** Doc IDs are built from truncated last names (e.g., `rod-bus-goo-val`) and injected into pretraining text; REPEAT is one of the injection strategies tested.
- **Augmentation:** Document-level augmentation (permuting facts N_aug times) is needed for out-of-domain Hits@1. Fact-level augmentation raises answer match but leaves citation accuracy unchanged. Citation becomes more difficult as the number of facts a document contains grows.
- **ID design (BioCite, REPEAT):**

  | Doc ID type | OOD EM | Hits@1 |
  |---|---|---|
  | Last-name IDs | 88.8 | 47.3 |
  | Random 8-digit IDs | 95.9 | 39.8 |

- **No last-name shortcut:** Across 352K pairs of questions about people sharing a surname, the mean Jaccard overlap of their top-10 predicted IDs is only 0.08. This suggests the model relies on fact content rather than guessing from the surname.
- **Limitations and code:** The study uses synthetic data, small models and corpora, and augmentation adds pretraining cost. Code and data are at github.com/mukhal/intrinsic-source-citation.

*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

- [Carnegie Mellon University](https://md.research.elamur.ai/free/en/universities/carnegie-mellon-university/) — University, Pittsburgh, United States · 539 works · 179,533 citations
- [Allen Institute for Artificial Intelligence](https://md.research.elamur.ai/free/en/labs/allen-institute-for-artificial-intelligence/) — Research institute, Seattle, United States · 275 works · 97,634 citations
- [University of Illinois Urbana-Champaign](https://md.research.elamur.ai/free/en/universities/university-of-illinois-urbana-champaign/) — University, Urbana, United States · 184 works · 69,372 citations
- [University of Michigan](https://md.research.elamur.ai/free/en/universities/university-of-michigan/) — University, Ann Arbor, United States · 70 works · 13,693 citations

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🧭 Topics (1): [🧠 Language models & pretraining](https://md.research.elamur.ai/free/en/topics/language-models/) · 3,320 works

## Cite

Cite as: Muhammad Khalifa, David Wadden, Emma Strubell, Honglak Lee, Lu Wang, Iz Beltagy and Hao Peng. 2024. Source-Aware Training Enables Knowledge Attribution in Language Models. arXiv:2404.01019.

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

```bibtex
@misc{khalifa2024source,
  title = {{Source-Aware Training Enables Knowledge Attribution in Language Models}},
  author = {Muhammad Khalifa, David Wadden, Emma Strubell, Honglak Lee, Lu Wang, Iz Beltagy and Hao Peng},
  year = {2024},
  doi = {10.48550/arxiv.2404.01019},
  eprint = {2404.01019},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2404.01019}
}
```

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*Updated 30 October 2026*
