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A unified variance-reduced accelerated gradient method for convex optimization

NeurIPS 2019 · Optimization › Nonconvex and smooth optimization · approach: Proximal finite-sum methods · 31 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Use direct acceleration with an epoch schedule that grows and then levels offVarag · Smooth convex finite-sum optimizationgradient evaluations: ${\cal O} \left\{m \log m + \sqrt{\tfrac{m D_0}{\epsilon}} \right\}$Helped
Use a unified step-size policy that adapts to the strong-convexity regimeVarag · Smooth convex finite-sum optimizationgradient evaluations: ${\cal O}\left\{ m \log \tfrac{D_0}{\epsilon} \right\}; ${\cal O} \left\{m \log m +\sqrt{\tfrac{m D_0}{\epsilon}} \rightHelped
Allow strong convexity to come from the smooth data-fidelity term rather than requiring it in the regularizerVarag · Lasso regressiontraining lossHelped
Apply Varag to unconstrained logistic regression without a strongly convex perturbationVarag · Unconstrained logistic regressiontraining lossHelped
Use Varag with restarts under an error-bound conditionVarag · Finite-sum optimization under an error boundgradient evaluations: ${\cal O}\left\{\big(m+\sqrt{\tfrac{m L}{\bar{\mu}}}\big)\log \tfrac{\psi({x}^0) - \psi(x^*)}{\epsilon}\right\}Helped
Use mini-batches of size $b$ in VaragVarag · Mini-batch finite-sum optimizationparallel speedup: factor $b$Helped
Use Varag rather than FGMFinite-sum convex quadratic problems satisfying an error bound · Convex quadratic problemstraining lossHelped
Set $\alpha_s=1$ and $p_s=0$, removing the accelerated multi-sequence scheme (ablation)Varag · Smooth strongly convex finite-sum optimizationgradient evaluations: ${\cal O}\{(m+L/\mu)\log(1/\epsilon)\}Hurt

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