Title: Smoothing Binary Optimization: A Primal-Dual Perspective
Primary area: optimization
Keywords: Binary optimization, combinatorial optimization, primal-dual, minimax optimization, gradient descent-ascent

Abstract: Binary optimization is a powerful tool for modeling combinatorial problems, yet scalable and theoretically sound solution methods remain elusive. Conventional solvers often rely on heuristic strategies with weak guarantees or struggle with large-scale instances. In this work, we introduce a novel primal-dual framework that reformulates unconstrained binary optimization as a continuous minimax problem, satisfying a strong max-min property. This reformulation effectively smooths the discrete problem, enabling the application of efficient gradient-based methods. We propose a simultaneous gradient descent-ascent algorithm that is highly parallelizable on GPUs and provably converges to a near-optimal solution in linear time. Extensive experiments on large-scale problems—including Max-Cut, MaxSAT, and Maximum Independent Set with up to 50,000 variables—demonstrate that our method identifies high-quality solutions within seconds, significantly outperforming state-of-the-art alternatives.