Benchmark across architectures and shift regimes finds OOD detector rankings shift with representation collapse; proposes NC-based shortlist predictor and PCA filter without extra OOD data.
Equiangularity dictates that any pair of class means are equally spacedcosu(i, j) =β,∀i̸=j , meaning that for an off-target logitg(h) j =w ⊤ j h+b k ≈w ⊤ j µk =α∥µ k∥2β=αR 2β
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A Systematic Analysis of Out-of-Distribution Detection Under Representation and Training Paradigm Shifts
Benchmark across architectures and shift regimes finds OOD detector rankings shift with representation collapse; proposes NC-based shortlist predictor and PCA filter without extra OOD data.