2 papers
cs.AI2026
Beyond Decision Boundaries: Relational Geometry Attacks on Contrastive Embedding Manifolds
Fei Zhao, Peiyuan Zhang, Xi Li +2
Contrastive learning and Siamese embedding models have become the foundation of modern verification systems, where decisions are governed not by discrete classification boundaries,…
cs.CV2025
MarkMatch: Same-Hand Stuffing Detection
Fei Zhao, Runlin Zhang, Chengcui Zhang +1
We present MarkMatch, a retrieval system for detecting whether two paper ballot marks were filled by the same hand. Unlike the previous SOTA method BubbleSig, which used binary cla…