Author

Xu Zhang

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#machine learning Preprint Sep 2026

Understanding In-Context Multimodal Jailbreaks via Posterior Reweighting

Preliminary reweighting is established as a unifying and predictive framework for understanding and mitigating ICL jailbreak in MLLMs and a posterior-aware inference-time defense is introduced that adaptively injects benign counter-evidence based on estimated risk, effectively suppressing harmful posterior drift while...

Xu Zhang, Deven Mahesh Mistry, Xiang Xu et al. · 0 citations

#machine learning Preprint Sep 2026

Communication-Efficient Personalized Federated Learning via Layer-Wise Multi-Threshold Random Sketching

This work proposes a communication-efficient PFL framework via layer-wise multi-threshold random sketching that supports bidirectional communication using compact low-bit sketches and improves the communication-accuracy tradeoff compared with existing one-bit compression approaches.

Xu Zhang, Xing-Yu Hou, Jia-Cheng Cheng et al. · 0 citations