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Author

Haodong Zhu

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#artificial intelligence Preprint Sep 2026

Optimal Design for Active Preference Learning with Biased LLM Judges

Learning from human preferences is central to large language model (LLM) alignment, but human preference annotation is costly. Active preference learning reduces this cost by selecting informative comparisons, and LLM judges can provide additional scalable feedback. However, the preferences of the judges may deviate fr...

Zhong-Man Du, Hui-Ming Zhang, Hao-Dong Zhu et al. · 0 citations
#machine learning Preprint Sep 2026

GraphHCA: Closed-Form Hindsight Credit Assignment for Long-Horizon LLM Agents

Group-based reinforcement learning (RL) has advanced large language models (LLMs) and is increasingly extending to agentic tasks, where sparse terminal rewards make step-level credit assignment essential. Existing methods assign credit from what follows an action in sampled rollouts, but do not explicitly capture its r...

Hao-Dong Zhu, Yang-Yang Ren, Chang-Bai Li et al. · 0 citations
#machine learning Preprint Sep 2026

MaPP: A Unified Marginalized Posterior-Predictive Framework for Data-Efficient RLVR

Reinforcement learning with verifiable rewards (RLVR) improves the reasoning capabilities of large language models but incurs substantial costs from rollouts and policy updates. Online prompt selection improves efficiency by using per-prompt Bayesian posteriors to predict difficulty and prioritize informative prompts....

Yang-Yang Ren, Hao-Dong Zhu, Sheng Xu et al. · 0 citations
Jul 2026

Kalman Meets Curriculum: Efficient Dynamic Prompt Selection for Adaptive RL Finetuning

A Kalman-Guided Prompt Selection method (KGPS), which reformulates prompt selection as a dynamic state estimation problem rather than static difficulty prediction, and consistently improves both final accuracy and rollout efficiency over strong baselines, establishing state-of-the-art performance among online prompt se...

Hao-Dong Zhu, Yang-Yang Ren, Yanjing Li et al. · 2 citations · ⚡2

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