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Cutting plane methods can be extended into nonconvex optimization
Proceedings of the 31st Conference On Learning Theory, PMLR 75:1451-1454, 2018.
Abstract
We show that it is possible to obtain an O(ϵ−4/3) runtime — including computational cost — for finding ϵ-stationary points of nonconvex functions using cutting plane methods. This improves on the best known epsilon dependence achieved by cubic regularized Newton of O(ϵ−3/2) as proved by Nesterov and Polyak (2006). Our techniques utilize the convex until proven guilty principle proposed by Carmon, Duchi, Hinder, and Sidford (2017).