Poster
Semi-Cyclic Stochastic Gradient Descent
Hubert Eichner · Tomer Koren · Brendan McMahan · Nati Srebro · Kunal Talwar
Pacific Ballroom #148
Keywords: [ Large Scale Learning and Big Data ] [ Optimization - Others ] [ Parallel and Distributed Learning ]
We consider convex SGD updates with a block-cyclic structure, i.e., where each cycle consists of a small number of blocks, each with many samples from a possibly different, block-specific, distribution. This situation arises, e.g., in Federated Learning where the mobile devices available for updates at different times during the day have different characteristics. We show that such block-cyclic structure can significantly deteriorate the performance of SGD, but propose a simple approach that allows prediction with the same guarantees as for i.i.d., non-cyclic, sampling.
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