Keywords: Shuffling gradient method; nonconvex-concave minimax problem; oracle complexity; sample without replacement
TL;DR: This paper develops two novel shuffling-based algorithms to solve two classes of nonconvex-concave minimax problems that have provable convergence guarantees.
Abstract: This paper aims at developing novel shuffling gradient-based methods for tackling two classes of minimax problems: nonconvex-linear and nonconvex-strongly concave settings. The first algorithm addresses the nonconvex-linear minimax model and achieves the state-of-the-art oracle complexity typically observed in nonconvex optimization. It also employs a new shuffling estimator for the ``hyper-gradient'', departing from standard shuffling techniques in optimization. The second method consists of two variants: semi-shuffling and full-shuffling schemes. These variants tackle the nonconvex-strongly concave minimax setting. We establish their oracle complexity bounds under standard assumptions, which, to our best knowledge, are the best-known for this specific setting. Numerical examples demonstrate the performance of our algorithms and compare them with two other methods. Our results show that the new methods achieve comparable performance with SGD, supporting the potential of incorporating shuffling strategies into minimax algorithms.
Supplementary Material: zip
Primary Area: Optimization (convex and non-convex, discrete, stochastic, robust)
Submission Number: 7560
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