Learning with symmetric label noise: The importance of being unhinged
van Rooyen, Brendan, Menon, Aditya Krishna, & Williamson, Robert C. (2015) Learning with symmetric label noise: The importance of being unhinged. In Advances in Neural Information Processing Systems 28 (NIPS 2015), Neural Information Processing Systems Foundation, Inc., Palais des Congrès de Montréal, Montréal, Canada, pp. 10-18.
Convex potential minimisation is the de facto approach to binary classification. However, Long and Servedio  proved that under symmetric label noise (SLN), minimisation of any convex potential over a linear function class can result in classification performance equivalent to random guessing. This ostensibly shows that convex losses are not SLN-robust. In this paper, we propose a convex, classification-calibrated loss and prove that it is SLN-robust. The loss avoids the Long and Servedio  result by virtue of being negatively unbounded. The loss is a modification of the hinge loss, where one does not clamp at zero; hence, we call it the unhinged loss. We show that the optimal unhinged solution is equivalent to that of a strongly regularised SVM, and is the limiting solution for any convex potential; this implies that strong l2 regularisation makes most standard learners SLN-robust. Experiments confirm the unhinged loss’ SLN-robustness.
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|Item Type:||Conference Paper|
|Divisions:||Current > Research Centres > ARC Centre of Excellence for Mathematical & Statistical Frontiers (ACEMS)
Current > Schools > School of Mathematical Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2015 Neural Information Processing Systems Foundation, Inc.|
|Deposited On:||04 Jan 2016 03:08|
|Last Modified:||05 Jan 2016 05:31|
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