Author

Xianpeng Zhang

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#artificial intelligence Preprint Sep 2026

Learn from the Gap: Differential-Aware Advantage Pruning with Adaptive Rollout Sampling for GRPO

Recently, Group Relative Policy Optimization (GRPO) and its variants have been developed for policy optimization and demonstrated notable performance gains. However, these methods usually incur substantial computational overhead due to per-question multi-rollout sampling and repeated per-token probability evaluation ac...

Jia-Hua Yang, Zhiwei Yang, Xian-Peng Zhang et al. · 0 citations

Jul 2026

MMLDSum-LLM: Multimodal Long-Document Summarization with Visual-Alignment and Keyword-Aware

This work introduces MMLDSum-Bench, a high-quality benchmark for multimodal long-document summarization, and proposes MMLDSum-LLM, a reproducible two-stage training framework that combines supervised fine-tuning with visual-alignment weighted loss and keyword-aware weighted loss, followed by GRPO with a multi-objective...

Xianpeng Zhang, Jiahuai Yang, Dong Chen et al. · arXiv.org · 0 citations