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Xi-Lin Chen

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Nov 2026

Improving Policy Learning via Language-Guided State Representation in World Models

World models have emerged as powerful technology for facilitating policy learning in robotics by providing predictive representations of environmental dynamics. A crucial component of such models is the internal state representation, which serves as a bridge between observation, decision-making, and future state predic...

Li-Xuan Zhang, Meina Kan, Shiguang Shan et al. · 0 citations
Preprint Sep 2026

V-Gym: Enhancing Agentic Visual Reasoning via Skill-Data Co-Evolution

Advances in multimodal understanding, reasoning, and tool use enable agents to tackle increasingly complex visual reasoning tasks. By distilling past execution experience into reusable skills, agents can transfer lessons from both successes and failures into future reasoning, reducing repeated errors and improving capa...

Bei Yan, Yue-Cong Min, Jie Zhang et al. · 0 citations
Preprint Sep 2026

Beyond Saying Less: Fine-Grained Alignment for Informative and Faithful Vision-Language Models

This work proposes a fine-grained alignment framework that couples dense reward signals at the data level with precise credit assignment at the algorithmic level to prevent response-level shared advantages from allowing local hallucinations to compromise all other valid outputs within the same response.

Xing-Ming Long, Jie Zhang, Yue-Cong Min et al. · 0 citations
#small language model Preprint Sep 2026

Backdoor as Probe: Test-Time Adversarial Defense for CLIP

Backdoor as Probe is proposed, a test-time adversarial defense for CLIP that improves average robust accuracy from 1.0\% to 52.3\% while retaining clean accuracy, achieving performance comparable to state-of-the-art methods with up to a \(5.7\times\) inference speedup.

Zhong Ling Wang, Jie Zhang, Sen Nie et al. · 0 citations
#machine learning Preprint Sep 2026

One Attack to Fool Them All: Highly Transferable Black-Box Adversarial Attacks on Frontier MLLMs

This work proposes O-Attack, a highly transferable black-box attack framework that outperforms six state-of-the-art methods in black-box transferability, with consistent effectiveness across prompts and improved efficiency and imperceptibility.

Sen Nie, Jie Zhang, Zhong Ling Wang et al. · 0 citations
Jul 2026

Dual Adversarial Fine-tuning for Enhancing Robustness of Large Vision Language Model

While Large Vision-Language Models (LVLMs), represented by LLaVA and GPT-4V, have demonstrated remarkable capabilities, their visual inputs remain vulnerable to adversarial attacks, posing significant security risks. Existing defense methods predominantly target single-task scenarios (e.g., zero-shot classification) an...

Sibo Wang, Jie Zhang, Shiguang Shan et al. · 0 citations

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