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Fan Xu

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#artificial intelligence Preprint Sep 2026

Spotter: Let the Embodied Model Lead, and the VLM Reflect for It

Spotter is proposed, which reverses the roles: the embodied model leads and executes continuously, while the VLM runs in parallel, monitors through a lightweight local screener, intervenes only when an error is detected, reflects on and corrects it, and returns control.

Long Li, Qi-Chao Zhao, Yue Yang et al. · 0 citations
Preprint Aug 2026

DAVET: Denoising-Aware Visual Evidence Trajectory Allocation for Diffusion Vision-Language Models

Denoising-Aware Visual Evidence Trajectory Allocation (DAVET), a training-free framework that allocates visual evidence according to the evolving generation state, achieves an average speedup of 1.55 times with an average relative performance drop of 1.86%, showing that denoising-aware visual evidence allocation can re...

Yongkang Zhou, Xiang-Wen Xia, Cheng Yan et al. · 0 citations
Preprint Aug 2026

Beyond the Mean: Multi-Moment Policy Optimization for LLM Reasoning

A moment-based perspective on policy optimization for LLM reasoning is introduced by treating the failure probability of a randomly sampled problem as a random variable and characterizing optimization objectives through its moments, leading to MMPO, a novel policy optimization framework that jointly minimizes multiple...

Yijun Zhang, Yule Xie, Jia-Xin Ding et al. · 0 citations
Aug 2026

Training-Free Pseudo-Fusion for Composed Image Retrieval via Diffusion Models and Multimodal Large Language Models

This work proposes PeFuse (for pseudo-fusion), a training-free framework that leverages pretrained Diffusion Models and Multimodal Large Language Models to bridge modalities via generative conversion, and introduces two novel strategies: uni-directional and bi-directional conversion, which convert CIR into four single-...

Fan Xu, Luis A. Leiva · 0 citations
Conference Open access 2026

MMAC: A Multilingual, Multimodal Alignment Framework for Cultural Grounding Evaluation

The causes of modal divergence are probed, offering insights into fostering culturally robust MLLMs, and a Multilingual, Multimodal Alignment framework for Cultural grounding evaluation is proposed.

Weihua Zheng, Zhengyuan Liu, Tanmoy Chakraborty et al. · 0 citations
Jul 2026

Information Gain-based Rollout Policy Optimization: An Adaptive Tree-Structured Rollout Approach for Multi-Turn LLM Agents

Information Gain-based Rollout Policy Optimization (IGRPO) is proposed, a policy optimization framework that treats intermediate-state informativeness as the organizing principle of rollout collection and performs budget-aware tree-structured rollouts by allocating expansion budget according to node-level informativene...

Yijun Zhang, Fan Xu, Jiaxin Ding et al. · 2 citations

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