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Minibatch vs Local SGD with Shuffling: Tight Convergence Bounds and Beyond

ICLR 2022 · Optimization › Nonconvex and smooth optimization · approach: Stochastic gradient last-iterate analysis · 1 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Replace with-replacement minibatch SGD sampling with random reshufflingMinibatch SGD · PL-smooth objectives, sufficiently large Kobjective suboptimality convergence rate: \tilde{\mc O}(\frac{L^2 \nu^2}{\mu^3 MNK^2}) versus \Theta (\frac{\nu^2}{\mu MNK})Helped
Replace with-replacement local SGD sampling with random reshufflingLocal SGD · PL-smooth objectives, K \gtrsim \kappaobjective suboptimality convergence rate: \tilde {\mc O} (\frac{L\nu^2}{\mu^2 MNK}+\frac{L^2 \nu^2 B}{\mu^3 N^2K^2}+\frac{L^2\tau^2 B^2}{\mu^3 N^2 K^2}) versus \tHelped
Use local updates instead of aggregating a minibatch at the shared iterateMinibatch RR · PL-smooth objectivesobjective suboptimality convergence rate: \frac{\nu^2 B}{N^2K^2}+\frac{\tau^2 B^2}{N^2K^2}Mixed
Increase local synchronization interval to B = \Theta(N)Local RR · Homogeneous objectivesobjective suboptimality convergence rate: \tilde{\mc O}(\frac{1}{NK^2})Hurt
Coordinate machine permutations by broadcasting shifted versions of a shared random permutationMinibatch RR · Component-wise near-homogeneous objectivesobjective suboptimality convergence rate: \frac{\nu^2}{MNK^2} -> \frac{\nu^2}{M^2NK^2}Helped
Coordinate machine permutations by broadcasting shifted versions of a shared random permutationLocal RR · Component-wise near-homogeneous objectives, frequent communicationobjective suboptimality convergence rate: \frac{\nu^2}{MNK^2} -> \frac{\nu^2}{M^2NK^2}Helped
Increase the number of machines M under synchronized shuffling and near-homogeneityMinibatch RR with SyncShuf · Component-wise near-homogeneous objectivestotal cost: \frac{1}{M}Helped
Increase minibatch size BMinibatch RR · PL-smooth objectivestotal costHelped
Increase synchronization interval BLocal RR · PL-smooth objectiveslocal-update error contribution to convergence rate: \frac{\nu^2 B}{N^2K^2}+\frac{\tau^2 B^2}{N^2K^2}Hurt
Set B = 1 so local RR makes no multi-step local-update divergenceLocal RR · Homogeneous objectiveconvergence behavior relative to minibatch RRNo clear effect

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