DA-PFL: Dynamic Affinity Aggregation for Personalized Federated Learning
This addresses class imbalance for clients in federated learning, but it is incremental as it builds on existing similarity-based methods.
The paper tackles the class imbalance problem in personalized federated learning by proposing a dynamic affinity aggregation model, which improves client accuracy on three real-world datasets compared to state-of-the-art methods.
Personalized federated learning becomes a hot research topic that can learn a personalized learning model for each client. Existing personalized federated learning models prefer to aggregate similar clients with similar data distribution to improve the performance of learning models. However, similaritybased personalized federated learning methods may exacerbate the class imbalanced problem. In this paper, we propose a novel Dynamic Affinity-based Personalized Federated Learning model (DA-PFL) to alleviate the class imbalanced problem during federated learning. Specifically, we build an affinity metric from a complementary perspective to guide which clients should be aggregated. Then we design a dynamic aggregation strategy to dynamically aggregate clients based on the affinity metric in each round to reduce the class imbalanced risk. Extensive experiments show that the proposed DA-PFL model can significantly improve the accuracy of each client in three real-world datasets with state-of-the-art comparison methods.