Federated learning often suffers from unstable and slow convergence due to heterogeneous characteristics of participating clients. Such tendency is aggravated when the client participation ratio is low since the information collected from the clients at each round is prone to be more inconsistent. To tackle the challenge, we propose a novel federated learning framework, which improves the stability of the server-side aggregation step, which is achieved by sending the clients an accelerated model estimated with the global gradient to guide the local gradient updates. Our algorithm naturally aggregates and conveys the global update information to participants with no additional communication cost and does not require to store the past models in the clients. We also regularize local update to further reduce the bias and improve the stability of local updates. We perform comprehensive empirical studies on real data under various settings and demonstrate the remarkable performance of the proposed method in terms of accuracy and communication-efficiency compared to the state-of-the-art methods, especially with low client participation rates. Our code is available at https://github.com/ ninigapa0/FedAGM

提出一种新的联邦学习框架，通过发送全局梯度估计的加速模型来引导本地梯度更新，从而改进了服务器端聚合步骤的稳定性，实现了自然聚合和传递全局更新信息，同时不需要额外的通信成本和客户机中存储过去的模型。在现实数据下进行全面的实证研究，证明了所提方法在精度和通信效率方面相对于现有方法的显着性能，尤其是在低客户端参与率下。

具有全局动量加速的通信高效联邦学习