Journal of the Operations Research Society of China ›› 2026, Vol. 14 ›› Issue (2): 521-532.doi: 10.1007/s40305-024-00568-7

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On the O(1/K2) Ergodic Convergence of ADMM with Dual Step Size from 0 to 2

Tao Zhang1,2   

  1. 1 School of Mathematics and Statistics, Linyi University, Linyi 276000, Shandong, China, 2 LMIB of the Ministry of Education, School of Mathematical Sciences, Beihang University, Beijing 100191, China
  • Received:2023-10-24 Revised:2024-09-01 Online:2026-06-30 Published:2026-07-06
  • Contact: Tao Zhang E-mail:shuxuekuangwu@buaa.edu.cn

Abstract: We initially establish the O(1/K2) (K represents the number of iterations) ergodic convergence rate of the alternating direction method of multipliers (ADMM) with dual step size from 0 to 2 and dynamically updating the penalty parameter. The convergence rate is derived under the assumption that the two objective functions involved are linear and strongly convex, respectively. In contrast, there is no convergence rate analysis for ADMM with dual step size ranging from 0 to 2 and dynamically updating the penalty parameter. Furthermore, we analyze the convergence to the solution.

Key words: Strongly convex, Alternating direction method of multipliers, Convergence rate

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