Vahidian, Saeed, Mahdi Morafah, Weijia Wang, Vyacheslav Kungurtsev, Chen Chen, Mubarak Shah, and Bill Lin. “Efficient Distribution Similarity Identification in Clustered Federated Learning via Principal Angles Between Client Data Subspaces”. Proceedings of the AAAI Conference on Artificial Intelligence 37, no. 8 (June 26, 2023): 10043–10052. Accessed May 22, 2026. https://ojs.aaai.org/index.php/AAAI/article/view/26197.