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Peng-Cheng Xu

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#machine learning Preprint Sep 2026

Make Sparse Rewards Count: Density-Aware Reward Aggregation for Multi-Reward RL

Multi-reward reinforcement learning trains large language models to satisfy multiple behavioral objectives simultaneously. Reward-wise normalization, as used in GDPO, preserves reward-specific relative information within rollout groups, but different objectives can still exhibit uneven learning progress. We study this...

Tong Zheng, Skylar Zhai, Zhan Cheng et al. · 0 citations
#artificial intelligence Preprint Sep 2026

Guide, Then Let Go: Gap-Adaptive Teacher Scheduling for Sparse-Reward Agentic RL

Reinforcement learning for long-horizon agents typically relies on sparse outcome-based rewards. This leads to a severe cold-start problem, as early-stage policies often fail to solve sampled tasks, leaving little useful reward signal for learning. To mitigate this problem, we use on-policy distillation (OPD) to provid...

You-Ling Huang, Tian-Kuo Xu, Jia-Ji Liu et al. · 0 citations
#artificial intelligence Preprint Sep 2026

UOPD: Uncertainty-Aware Intervention for On-Policy Distillation of Multi-Turn Agents

On-policy distillation (OPD) trains a student on its own rollouts using dense supervision from a teacher. In multi-turn environments, a mistake at a critical decision step can redirect the subsequent rollout toward poor outcomes. We use low teacher confidence on student actions to select high-uncertainty steps for corr...

Wen-Bo Zhang, Peng-Cheng Xu, Wei-Zhi Du et al. · 0 citations

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