FedDuA sets each round's global learning rate to the average squared client-update norm divided by the aggregated update norm under an adaptive coordinate preconditioner, a rule that is minimax-optimal under an approximate projection condition and convergent for convex objectives.
The grid of ηg is{10−1,10−1/2,10 0,10 1/2,10 1} for Fe- dAvg(M) and SCAFFOLD, and{10−4,10−7/2,10−3,10−5/2,10−2} for FedOPT
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FedDuA: Doubly Adaptive Federated Learning
FedDuA sets each round's global learning rate to the average squared client-update norm divided by the aggregated update norm under an adaptive coordinate preconditioner, a rule that is minimax-optimal under an approximate projection condition and convergent for convex objectives.