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Communication constraints are one of the majorchallenges preventing the wide-spread adoption of Federated Learning systems. Recently, Federated Distillation (FD), a new algorithmic paradigm for Federated Learning with fundamentally different communication properties, emerged. FD methods leverage ensemble distillation techniques and exchange model outputs, presented as soft labels on an unlabeled public data set, between the central server and the participating clients. In this work, we investigate FD from the perspective of communication efficiency by analyzing the effects of active distillation-data curation, soft-label quantization, and delta-coding techniques. Based on the insights gathered from this analysis, we present Compressed Federated Distillation (CFD), an efficient Federated Distillation method. Extensive experiments, on Federated image classification and language modeling problems, at different levels of data heterogeneity, demonstrate that our method can reduce the amount of communication necessary to achieve fixed performance targets by more than two orders of magnitude when compared to FD, and by more than four orders of magnitude when compared to parameter averaging based techniques like Federated Averaging.

CFD: Communication-Efficient Federated Distillation via Soft-Label Quantization and Delta Coding