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Author

Lang Chen

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#artificial intelligence Preprint Oct 2026

Distributional Reward Calibration and Budget-Neutral Credit Assignment for Multimodal RLVR

We revisit advantage estimation in Group Relative Policy Optimization (GRPO) and observe that any token-level advantage admits a two-stage factorization: a \emph{sample-level baselining} step that converts scalar verifier rewards into a comparable sequence-level signal, and a \emph{token-level credit assignment} step t...

Lang Chen, Zong-Xin Xu, Bo-Rui Wang et al. · 0 citations
Book Open access Aug 2026

UniDocVLM: Enhancing Visual Reasoning and Document Understanding for VLM via Reinforcement Learning

UnicDocVLM is proposed, an end-to-end framework that unifies OCR and visual RAG within a single vision-language model: the model first generates a structured parse of retrieved pages, then activates question-relevant evidence from the parse to support grounded reasoning and answering.

Zong-Sheng Cao, Anran Liu, Jun Xie et al. · 0 citations
Book Open access Aug 2026

UniDocVLM: Enhancing Visual Reasoning and Document Understanding for VLM via Reinforcement Learning

UnicDocVLM is proposed, an end-to-end framework that unifies OCR and visual RAG within a single vision-language model: the model first generates a structured parse of retrieved pages, then activates question-relevant evidence from the parse to support grounded reasoning and answering.

Zongsheng Cao, Anran Liu, Jun Xie et al. · 0 citations

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