Federated Learning (FL) is a well-known framework for successfully performing a learning task in an edge computing scenario where the devices involved have limited resources and incomplete data representation. The basic assumption of FL is that the devices communicate directly or indirectly with a parameter server that centrally coordinates the whole process, overcoming several challenges associated with it. However, in highly pervasive edge scenarios, the presence of a central controller that oversees the process cannot always be guaranteed, and the interactions (i.e., the connectivity graph) between devices might not be predetermined, resulting in a complex network structure. Moreover, the heterogeneity of data and devices further complicates the learning process. This poses new challenges from a learning standpoint that we address by proposing a communication-efficient Decentralised Federated Learning (DFL) algorithm able to cope with them. Our solution allows devices communicating only with their direct neighbours to train an accurate model, overcoming the heterogeneity induced by data and different training histories. Our results show that the resulting local models generalise better than those trained with competing approaches, and do so in a more communication-efficient way.

在高度普及的边缘场景中，缺乏中央控制器和预定的设备连接导致了复杂的网络结构，我们提出了一种通信高效的分散式联邦学习（DFL）算法来解决由数据和不同训练历史引起的异构学习难题，研究结果表明，与竞争方法相比，我们的解决方案能够训练出更好的本地模型并且在通信效率上更为优越。

无协调的复杂网络分散式联邦学习: 克服异构性