Author

Yubo Zhu

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Preprint Aug 2026

When Does Visual Generation Help Visual Understanding in Unified Multimodal Models?

VGAU-Diag is introduced, a fine-grained evaluation framework for vision generation-assisted understanding that stratifies samples by difficulty, enables unified evaluation of multiple reasoning paradigms, and uses Oracle-Ass Reference Protocols.

Yubo Zhu, Zhehan Kan, Jing-Yi Yang et al. · 0 citations

#small language model Preprint Aug 2026

Mitigating Database Leakage in RAG Systems with Keyword-Grounded Fact Substitution

KFS-RAG is proposed, a defense that mitigates information leakage by reformulating the retrieved context by identifying a small set of influential keywords from the retrieved context via an attention rollout plus a causal perturbation mechanism.

Ziliang Zhang, Yubo Zhu, Wei Tong et al. · 0 citations

Preprint Aug 2026

PURPOSE: Poisoning Conflict Resolution in RAG via Proxy-Fact-Grounded Updates

PURPOSE is proposed, a strict black-box poisoning attack that reframes the injection as an update that minimizes conflict, rather than as a counter-claim, and identifies non-contradicting injection as a practical mode to enhance poisoning attack.

Zijian Wang, Yubo Zhu, M. Dong et al. · 0 citations