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Hao Peng

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Preprint Sep 2026

KUAISHOU Explorer LLM-Rec Challenge 2026: Reasoning Generative Recommendation

A series of models are explored that connect item Semantic IDs with natural language in a unified representation space and seek to unlock the potential of natural-language chain-of-thought (CoT) reasoning for recommendation, including OneReason.

Jiang-Xia Cao, Hao Peng, Wen-Long Xu et al. · 0 citations
#machine learning Preprint Sep 2026

CATCH: A Controllable Analysis Testbed for Reward Hacking in Coding RL

During reinforcement learning with verifiable rewards (RLVR), large language models (LLMs) can exploit loopholes in their environments to obtain high rewards without improving the intended capabilities, i.e., reward hacking. Despite its risks to training efficiency and safety, monitoring and mitigating reward hacking d...

Shou-Li Wang, Yan-Feng Jia, Zhi-Hao Ou et al. · 0 citations

Reproducing, Analyzing, and Detecting Reward Hacking in Rubric-Based Reinforcement Learning

CHERRL is introduced, a Controllable Hacking Environment for Rubric-based RL that enables stable reproduction of reward hacking, explicit observation of reward divergence, and identification of hacking onset and analyzes different judge biases from the perspectives of discoverability and exploitability.

Xuekang Wang, Zhuoyuan Hao, Shuo Hou et al. · 10 citations · ⚡1

Can LLM-as-a-Judge Reliably Verify Rubrics in Agentic Scenarios?

RuVerBench is introduced, the first benchmark for assessing LaaJ reliability in rubric verification for agentic scenarios, and the impact of key LaaJ strategies, including prompt design, batching, and majority voting, on rubric verification is analyzed.

Yangda Peng, Yunjia Qi, Hao Peng et al. · 2 citations
Preprint Aug 2026

TRAJDEBUG: Tracing Error Lifecycle to Identify Critical Failures in Long-Horizon Agent Trajectories

TrajDebug is proposed, an error-lifecycle tracing framework that addresses long-trajectory error discovery with multi-granularity history compression and evidence-based error identification, and supports critical attribution by tracing each error's resolution status and terminal impact.

Yunjia Qi, Zehua Yin, Xin Shi et al. · 4 citations · ⚡1

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