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Expander Graph and Communication-Efficient Decentralized Optimization

In this paper, we discuss how to design the graph topology to reduce the communication complexity of certain algorithms for decentralized optimization. Our goal is to minimize the total communication needed to achieve a prescribed accuracy. We discover that the so-called expander graphs are near-optimal choices. We propose three approaches to construct expander graphs for different numbers of nodes and node degrees. Our numerical results show that the performance of decentralized optimization is significantly better on expander graphs than other regular graphs.

preprint2016arXivOpen access
Yat-Tin ChowWei ShiTianyu WuWotao Yin
math.OCDistributed, Parallel, and Cluster ComputingMultiagent Systems
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Yat-Tin ChowWei ShiTianyu WuWotao Yin

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