联邦学习团队终于有了应对数据漂移的实用方案——FlashbackCL直接替换Flashback即可，做边缘设备或持续学习部署的开发者值得一试。
联邦学习中客户端数据分布随时间漂移会导致模型遗忘，现有方法如Flashback假设分布静止，无法应对时间变化。FlashbackCL通过引入时间衰减标签计数、设备感知重放缓冲区和服务器端核心集筛选，在CIFAR-10上相对Flashback提升6.9%-10.0%，时间遗忘减少68%。在静态CIFAR-100上也提升3.5个点，表明类平衡重放对空间和时间异质性均有正则化效果。
FlashbackCL: Mitigating Temporal Forgetting in Federated Learning
Federated Learning (FL) of foundation and edge models increasingly targets deployments where client data distributions drift over time, yet existing forgetting-mitigation methods assume each client's distribution is stationary. Flashback, the strongest recent FL method against cross-client (spatial) forgetting, uses monotonically accumulating per-class label counts as a knowledge proxy; this proxy becomes miscalibrated under temporal distribution shift and anchors the global model to an outdated class balance. We formalise temporal forgetting in FL with a per-phase metric isolated from protocol-level fluctuations and propose Flashback Continual Learning (FlashbackCL), a drop-in extension of Flashback with (i) temporally-decayed label counts; (ii) a device-aware replay buffer with Class-Balanced Reservoir Sampling (CBRS); and (iii) server-side active coreset curation on the public distillation set. The results show that FlashbackCL achieves 6.9% to 10.0% relative improvement relative to Flashback, on CIFAR-10 with 50 clients and three controlled temporal shift modes, while simultaneously reducing temporal forgetting by up to 68%. A 5-variant ablation identifies CBRS replay as the critical component. FlashbackCL also improves Flashback by 3.5 points on stationary CIFAR-100, suggesting that class-balanced replay regularises spatial heterogeneity as well as temporal shift.