Throughput-Optimal Topology Design for Cross-Silo Federated Learning

• URL: http://arxiv.org/abs/2010.12229v2
• Date: Tue, 17 Nov 2020 19:04:14 GMT
• Title: Throughput-Optimal Topology Design for Cross-Silo Federated Learning
• Authors: Othmane Marfoq, Chuan Xu, Giovanni Neglia, Richard Vidal
• Abstract summary: Federated learning usually employs a client-server architecture where an orchestrator iteratively aggregates model updates from remote clients and pushes them back a refined model. This approach may be inefficient in cross-silo settings, as close-by data silos with high-speed access links may exchange information faster than with the orchestrator. We propose practical algorithms that find a topology with the largest throughput or with provable throughput guarantees.
• Score: 13.922754427601493
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Federated learning usually employs a client-server architecture where an orchestrator iteratively aggregates model updates from remote clients and pushes them back a refined model. This approach may be inefficient in cross-silo settings, as close-by data silos with high-speed access links may exchange information faster than with the orchestrator, and the orchestrator may become a communication bottleneck. In this paper we define the problem of topology design for cross-silo federated learning using the theory of max-plus linear systems to compute the system throughput---number of communication rounds per time unit. We also propose practical algorithms that, under the knowledge of measurable network characteristics, find a topology with the largest throughput or with provable throughput guarantees. In realistic Internet networks with 10 Gbps access links for silos, our algorithms speed up training by a factor 9 and 1.5 in comparison to the master-slave architecture and to state-of-the-art MATCHA, respectively. Speedups are even larger with slower access links.

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