---
title: "Secrets of RLHF in Large Language Models Part II: Reward"
description: "In RLHF, reward models stand in for human judgment, but they have two weaknesses. 43 references, cited by 65 papers here."
authors: ["Binghai Wang", "Rui Zheng", "Lu Chen", "Yan Liu", "Shihan Dou", "Caishuang Huang", "Wei Shen", "Senjie Jin", "Enyu Zhou", "Chenyu Shi", "Songyang Gao", "Nuo Xu", "Yuhao Zhou", "Xiaoran Fan", "Zhiheng Xi", "Jun Zhao", "Xiao Wang", "Tao Ji", "Hang Yan", "Lixing Shen", "Zhan Chen", "Tao Gui", "Qi Zhang", "Xipeng Qiu", "Xuanjing Huang", "Zuxuan Wu", "Yu-Gang Jiang"]
year: 2024
venue: "arXiv:2401.06080"
source: "https://arxiv.org/abs/2401.06080"
doi: "10.48550/arxiv.2401.06080"
arxiv: "2401.06080"
licence: "arXiv — non-exclusive license to distribute"
licence_url: "http://arxiv.org/licenses/nonexclusive-distrib/1.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/wang-2024-secrets-rlhf-large-language-models/"
---
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# Secrets of RLHF in Large Language Models Part II: Reward Modeling

**Authors:** [Binghai Wang](https://md.research.elamur.ai/free/en/authors/binghai-wang/), [Rui Zheng](https://md.research.elamur.ai/free/en/authors/rui-zheng/), [Lu Chen](https://md.research.elamur.ai/free/en/authors/lu-chen/), [Yan Liu](https://md.research.elamur.ai/free/en/authors/yan-liu/), [Shihan Dou](https://md.research.elamur.ai/free/en/authors/shihan-dou/), [Caishuang Huang](https://md.research.elamur.ai/free/en/authors/caishuang-huang/), [Wei Shen](https://md.research.elamur.ai/free/en/authors/wei-shen/), [Senjie Jin](https://md.research.elamur.ai/free/en/authors/senjie-jin/), [Enyu Zhou](https://md.research.elamur.ai/free/en/authors/enyu-zhou/), Chenyu Shi, [Songyang Gao](https://md.research.elamur.ai/free/en/authors/songyang-gao/), [Nuo Xu](https://md.research.elamur.ai/free/en/authors/nuo-xu/), [Yuhao Zhou](https://md.research.elamur.ai/free/en/authors/yuhao-zhou/), [Xiaoran Fan](https://md.research.elamur.ai/free/en/authors/xiaoran-fan/), [Zhiheng Xi](https://md.research.elamur.ai/free/en/authors/zhiheng-xi/), [Jun Zhao](https://md.research.elamur.ai/free/en/authors/jun-zhao/), [Xiao Wang](https://md.research.elamur.ai/free/en/authors/xiao-wang/), [Tao Ji](https://md.research.elamur.ai/free/en/authors/tao-ji/), [Hang Yan](https://md.research.elamur.ai/free/en/authors/hang-yan/), Lixing Shen, Zhan Chen, [Tao Gui](https://md.research.elamur.ai/free/en/authors/tao-gui/), [Qi Zhang](https://md.research.elamur.ai/free/en/authors/qi-zhang/), [Xipeng Qiu](https://md.research.elamur.ai/free/en/authors/xipeng-qiu/), [Xuanjing Huang](https://md.research.elamur.ai/free/en/authors/xuanjing-huang/), Zuxuan Wu and [Yu-Gang Jiang](https://md.research.elamur.ai/free/en/authors/yu-gang-jiang/) · **Year:** 2024 · **Venue:** arXiv:2401.06080 · **Licence:** [arXiv — non-exclusive license to distribute](http://arxiv.org/licenses/nonexclusive-distrib/1.0/)

**Links:** [Publisher's page](https://arxiv.org/abs/2401.06080) · [PDF](https://arxiv.org/pdf/2401.06080) · [DOI 10.48550/arxiv.2401.06080](https://doi.org/10.48550/arxiv.2401.06080) · [arXiv 2401.06080](https://arxiv.org/abs/2401.06080) · [OpenAlex](https://openalex.org/W4390833718)

**Citations:** 7 citations (OpenAlex, 2026-10-14) · [65](https://md.research.elamur.ai/free/en/papers/wang-2024-secrets-rlhf-large-language-models/cited-by/) in our library, of the 149,439 papers whose bibliographies we read

## Summary
In RLHF, reward models stand in for human judgment, but they have two weaknesses. Preference labels are often wrong or unclear because annotators frequently disagree. Reward models also transfer poorly to out-of-distribution outputs, which makes iterative RLHF unreliable. This report from Fudan NLP Lab and Hikvision addresses both problems.

On the data side, the authors train an ensemble of reward models on the same comparisons. The average and spread of the models' score gaps serve as a measure of preference strength. This lets them separate likely mislabeled, ambiguous and normal pairs. They then flip incorrect labels, soften ambiguous ones and add an adaptive margin, scaled by strength, to the ranking loss.

On the algorithm side, a contrastive objective helps the model tell chosen and rejected answers apart. MetaRM, a meta-learning procedure, keeps the reward model sensitive to the policy's shifting outputs.

The authors report more stable PPO and steady gains over 3–4 iterative rounds on two datasets. This matters because a sturdier reward model underpins safer and more helpful alignment.

## Key points
- Prior annotation studies show weak human agreement: about 63% for Anthropic's crowd workers and 72.6 ± 1.5% among OpenAI labelers.
- An ensemble of M = 10 reward models scored the Anthropic HH-RLHF training set:
  - About 25% of pairs had a negative mean preference difference, suggesting flipped labels.
  - Score variance traced a U-shape across strength groups.
  - Agreement with GPT-4 labels rose as preference strength grew.
- Data-side fixes: label flipping, label smoothing and an adaptive margin in the Bradley-Terry loss.
- Algorithm-side methods: contrastive learning and MetaRM. They enabled iterative RLHF with consistent gains over 3–4 rounds on HH-RLHF and OpenAI's summarization data.
- Released resources (github.com/OpenLMLab/MOSS-RLHF): training code, HH-RLHF annotated with preference strength, and a GPT-4-cleaned validation set.

*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

- [Fudan University](https://md.research.elamur.ai/free/en/universities/fudan-university/) — University, Shanghai, China · 202 works · 22,509 citations
- [Hikvision](https://md.research.elamur.ai/free/en/companies/hikvision/) — Company, Hangzhou, China · 2 works · 165 citations

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🧭 Topics (1): [🧠 Language models & pretraining](https://md.research.elamur.ai/free/en/topics/language-models/) · 3,894 works

## Cite

Cite as: Binghai Wang, Rui Zheng, Lu Chen, Yan Liu, Shihan Dou, Caishuang Huang, Wei Shen, Senjie Jin, Enyu Zhou, Chenyu Shi, Songyang Gao, Nuo Xu, Yuhao Zhou, Xiaoran Fan, Zhiheng Xi, Jun Zhao, Xiao Wang, Tao Ji, Hang Yan, Lixing Shen, Zhan Chen, Tao Gui, Qi Zhang, Xipeng Qiu, Xuanjing Huang, Zuxuan Wu and Yu-Gang Jiang. 2024. Secrets of RLHF in Large Language Models Part II: Reward Modeling. arXiv:2401.06080.

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

```bibtex
@misc{wang2024secrets,
  title = {{Secrets of RLHF in Large Language Models Part II: Reward Modeling}},
  author = {Binghai Wang, Rui Zheng, Lu Chen, Yan Liu, Shihan Dou, Caishuang Huang, Wei Shen, Senjie Jin, Enyu Zhou, Chenyu Shi, Songyang Gao, Nuo Xu, Yuhao Zhou, Xiaoran Fan, Zhiheng Xi, Jun Zhao, Xiao Wang, Tao Ji, Hang Yan, Lixing Shen, Zhan Chen, Tao Gui, Qi Zhang, Xipeng Qiu, Xuanjing Huang, Zuxuan Wu and Yu-Gang Jiang},
  year = {2024},
  doi = {10.48550/arxiv.2401.06080},
  eprint = {2401.06080},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2401.06080}
}
```

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## References

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*Updated 2 November 2026*
