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• W3214291240 abstract "Stochastic variance reduced optimization methods are known to be globally convergent while they suffer from slow local convergence, especially when moderate or high accuracy is needed. To alleviate this problem, we propose an optimization algorithm -- which we refer to as a hybrid acceleration scheme -- for a class of proximal variance reduced stochastic optimization algorithms. The proposed optimization scheme combines a fast locally convergent algorithm, such as a quasi--Newton method, with a globally convergent variance reduced stochastic algorithm, for instance SAGA or L--SVRG. Our global convergence result of the hybrid acceleration method is based on specific safeguard conditions that need to be satisfied for a step of the locally fast convergent method to be accepted. We prove that the sequence of the iterates generated by the hybrid acceleration scheme converges almost surely to a solution of the underlying optimization problem. We also provide numerical experiments that show significantly improved convergence of the hybrid acceleration scheme compared to the basic stochastic variance reduced optimization algorithm." @default.
• W3214291240 created "2021-11-22" @default.
• W3214291240 creator A5030031115 @default.
• W3214291240 creator A5051816127 @default.
• W3214291240 date "2021-11-12" @default.
• W3214291240 modified "2023-09-27" @default.
• W3214291240 title "Hybrid Acceleration Scheme for Variance Reduced Stochastic Optimization Algorithms" @default.
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