Global admission-time gating with sentinel queries controls vector hubness in anisotropic embeddings, achieving recall 1.0 on critical attack points and 0.91 on HotFlip attacks with 1% false positives, while per-topic gates add no benefit.
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When Global Gating Is Enough: Admission-Time Hubness Control in Anisotropic Vector Retrieval Systems
Global admission-time gating with sentinel queries controls vector hubness in anisotropic embeddings, achieving recall 1.0 on critical attack points and 0.91 on HotFlip attacks with 1% false positives, while per-topic gates add no benefit.