ADOM: Accelerated Decentralized Optimization Method for Time-Varying Networks

• URL: http://arxiv.org/abs/2102.09234v1
• Date: Thu, 18 Feb 2021 09:37:20 GMT
• Title: ADOM: Accelerated Decentralized Optimization Method for Time-Varying Networks
• Authors: Dmitry Kovalev, Egor Shulgin, Peter Richt\'arik, Alexander Rogozin, Alexander Gasnikov
• Abstract summary: We propose ADOM - an accelerated method for smooth and strongly convex decentralized optimization over time-varying networks. Up to a constant factor, which depends on the network structure only, its communication is the same as that of accelerated Nesterov method.
• Score: 124.33353902111939
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose ADOM - an accelerated method for smooth and strongly convex decentralized optimization over time-varying networks. ADOM uses a dual oracle, i.e., we assume access to the gradient of the Fenchel conjugate of the individual loss functions. Up to a constant factor, which depends on the network structure only, its communication complexity is the same as that of accelerated Nesterov gradient method (Nesterov, 2003). To the best of our knowledge, only the algorithm of Rogozin et al. (2019) has a convergence rate with similar properties. However, their algorithm converges under the very restrictive assumption that the number of network changes can not be greater than a tiny percentage of the number of iterations. This assumption is hard to satisfy in practice, as the network topology changes usually can not be controlled. In contrast, ADOM merely requires the network to stay connected throughout time.

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