AI RESEARCH
FlashbackCL: Mitigating Temporal Forgetting in Federated Learning
arXiv CS.LG
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ArXi:2606.03939v1 Announce Type: new 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knowledge proxy; this proxy becomes miscalibrated under temporal distribution shift and anchors the global model to an outdated class balance.