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Zuozhu Liu

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#artificial intelligence Preprint Oct 2026

Dependency-Aware Reward Shaping for Agentic Reinforcement Learning

When training large language models with reinforcement learning, terminal rewards provide little guidance about which steps matter. Common methods for assigning step credit overlook that work built on uncorrected mistakes is wasted while independent work remains valid. With only a final success/failure reward, every st...

Zi-Yi Chen, Yan Zhang, Jian-Hui Wei et al. · 0 citations
#artificial intelligence Preprint Sep 2026

ReLMem: Learning Recurrent Memory for Longitudinal EHR Modeling

Recurrent Longitudinal Memory (ReLMem), a framework that learns to maintain fixed-capacity patient memory for efficient downstream prediction with a frozen LLM, is introduced and a multi-granularity optimization strategy to preserve task-relevant information throughout recurrent updates and support downstream predictio...

Zi-Jie Meng, Xi-Wei Dai, Ying-Ying Zhang et al. · 0 citations
#artificial intelligence Preprint Aug 2026

MedUAG: Unified Understanding and Generation for Medical Multimodal Models

This work develops MedUAG, an end-to-end trained unified medical model that achieves strong performance across a wide array of understanding and generation tasks, establishing a competitive baseline and paving the way for next-generation medical multimodal systems.

Zi-Jie Meng, Yun-Chen Zhang, Hualiang Wang et al. · 0 citations

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