Papers › FedPara: Low-Rank Hadamard Product for Communication-Efficient Federated Learning

FedPara: Low-Rank Hadamard Product for Communication-Efficient Federated Learning

13 Aug 2021ICLR 2022 4arXiv:2108.06098archive 2025-07-28

Nam Hyeon-Woo, Moon Ye-Bin, Tae-Hyun Oh

In this work, we propose a communication-efficient parameterization, FedPara, for federated learning (FL) to overcome the burdens on frequent model uploads and downloads. Our method re-parameterizes weight parameters of layers using low-rank weights followed by the Hadamard product. Compared to the conventional low-rank parameterization, our FedPara method is not restricted to low-rank constraints, and thereby it has a far larger capacity. This property enables to achieve comparable performance while requiring 3 to 10 times lower communication costs than the model with the original layers, which is not achievable by the traditional low-rank methods. The efficiency of our method can be further improved by combining with other efficient FL optimizers. In addition, we extend our method to a personalized FL application, pFedPara, which separates parameters into global and local ones. We show that pFedPara outperforms competing personalized FL methods with more than three times fewer parameters.

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