arxivcs.LGstat.ML2026-07-14
Fisher Rank Inflation: A Spectral Signature of Memorization under Label Noise
Satwik Bathula, Anand A. Joshi
Deep networks trained with label noise often learn clean structure before memorizing corrupted labels. We show that this transition leaves a spectral signature in the centered scatter of per-example last-layer gradients. Its effective rank transiently expands during memorization…