2014/09/10 by Yuchen Zhang, Lin Xiao, Zhang, Yuchen +1 · 13 citations
Computer Science · Engineering · Mathematics · #FOS: Computer and information sciences #FOS: Mathematics #Machine Learning (stat.ML) #Optimization and Control (math.OC) #Sparse and Compressive Sensing Techniques #Statistical Methods and Inference #Stochastic Gradient Optimization Techniques
paper · pdf · doi:10.48550/arxiv.1409.3257
openalex publication_date 2014/09/10 · openalex created_date 2025/10/27 · openalex updated_date 2026/07/28
We consider a generic convex optimization problem associated with regularized\nempirical risk minimization of linear predictors. The problem structure allows\nus to reformulate it as a convex-concave saddle point problem. We propose a\nstochastic primal-dual coordinate (SPDC) method, which alternates between\nmaximizing over a randomly chosen dual variable and minimizing over the primal\nvariable. An extrapolation step on the primal variable is performed to obtain\naccelerated convergence rate. We also develop a mini-batch version of the SPDC\nmethod which facilitates parallel computing, and an extension with weighted\nsampling probabilities on the dual variables, which has a better complexity\nthan uniform sampling on unnormalized data. Both theoretically and empirically,\nwe show that the SPDC method has comparable or better performance than several\nstate-of-the-art optimization methods.\n