Journal of the Operations Research Society of China ›› 2023, Vol. 11 ›› Issue (4): 783-807.doi: 10.1007/s40305-023-00470-8

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Accelerated Stochastic Peaceman-Rachford Method for Empirical Risk Minimization

Jian-Chao Bai1,2, Feng-Miao Bian3, Xiao-Kai Chang4, Lin Du5   

  1. 1. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, 518057, Guangdong, China;
    2. School of Mathematics and Statistics, Northwestern Polytechnical University, Xi'an 710129, Shaanxi, China;
    3. Department of Mathematics, The Hong Kong University of Science and Technology, Hong Kong, China;
    4. School of Science, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China;
    5. School of Mathematics and Statistics, the MIIT Key Laboratory of Dynamics and Control of Complex Systems, Northwestern Polytechnical University, Xi'an 710129, Shaanxi, China
  • Received:2022-06-22 Revised:2022-12-15 Online:2023-12-30 Published:2023-12-26
  • Contact: Jian-Chao Bai, Feng-Miao Bian, Xiao-Kai Chang, Lin Du E-mail:jianchaobai@nwpu.edu.cn;mafmbian@ust.hk;xkchang@lut.cn;lindu@nwpu.edu.cn
  • Supported by:
    This research was supported by the National Natural Science Foundation of China (Nos. 12001430, 11972292 and 12161053), the China Postdoctoral Science Foundation (No. 2020M683545) and the Guangdong Basic and Applied Basic Research Foundation (No. 2023A1515012405).

Abstract: This work is devoted to studying an accelerated stochastic Peaceman-Rachford splitting method (AS-PRSM) for solving a family of structural empirical risk minimization problems. The objective function to be optimized is the sum of a possibly nonsmooth convex function and a finite sum of smooth convex component functions. The smooth subproblem in AS-PRSM is solved by a stochastic gradient method using variance reduction technique and accelerated techniques, while the possibly nonsmooth subproblem is solved by introducing an indefinite proximal term to transform its solution into a proximity operator. By a proper choice for the involved parameters, we show that AS-PRSM converges in a sublinear convergence rate measured by the function value residual and constraint violation in the sense of expectation and ergodic. Preliminary experiments on testing the popular graph-guided fused lasso problem in machine learning and the 3D CT reconstruction problem in medical image processing show that the proposed AS-PRSM is very efficient.

Key words: Empirical risk minimization, Convex optimization, Stochastic Peaceman-Rachford method, Indefinite proximal term, Complexity

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