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NECO: NEural Collapse Based Out-of-distribution detection
Feb. 28, 2024, 5:44 a.m. | Mou\"in Ben Ammar, Nacim Belkhir, Sebastian Popescu, Antoine Manzanera, Gianni Franchi
cs.LG updates on arXiv.org arxiv.org
Abstract: Detecting out-of-distribution (OOD) data is a critical challenge in machine learning due to model overconfidence, often without awareness of their epistemological limits. We hypothesize that ``neural collapse'', a phenomenon affecting in-distribution data for models trained beyond loss convergence, also influences OOD data. To benefit from this interplay, we introduce NECO, a novel post-hoc method for OOD detection, which leverages the geometric properties of ``neural collapse'' and of principal component spaces to identify OOD data. Our …
arxiv cs.ai cs.cv cs.lg detection distribution neural collapse stat.ml type
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