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Communication-Efficient Distributed Primal-Dual Algorithm for Saddle Point Problems
Proceedings of the 33rd Conference on Uncertainty in Artificial Intelligence, PMLR R15:171-180, 2017.
Abstract
Primal-dual algorithms, which are proposed to solve reformulated convex-concave saddle point problems, have been proven to be effec- tive for solving a generic class of convex opti- mization problems, especially when the prob- lems are ill-conditioned. However, the sad- dle point problem still lacks a distributed op- timization framework where primal-dual algo- rithms can be employed. In this paper, we propose a novel communication-efficient dis- tributed optimization framework to solve the convex-concave saddle point problem based on primal-dual methods. We carefully de- sign local subproblems and a central problem such that our proposed distributed optimiza- tion framework is communication-efficient. We provide a convergence analysis of our proposed algorithm, and extend it to ad- dress non-smooth and non-strongly convex loss functions. We conduct extensive experi- ments on several real-world datasets to demon- strate competitive performance of the proposed method, especially on ill-conditioned prob- lems.