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arXiv 1406.4064math.OC
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乘子的平行方向法

Parallel Direction Method of Multipliers

Huahua Wang, Arindam Banerjee, Zhi-Quan Luo

摘要:

考虑了块可分凸函数在线性约束下的极小化问题。虽然两块线性约束的乘子交替方向法(ADMM)已经在理论和经验上得到了深入的研究,但尽管有一些初步的工作,ADMM对多块的有效推广仍然不清楚。本文提出了一种求解多块线性约束最优化问题的随机块坐标法--平行方向乘子法(PDMM)。PDMM并行随机更新一些原始和对偶块,表现得像并行随机块坐标下降。对于具有常数步长的PDMM,我们证明了其整体收敛和迭代复杂性。我们还表明,PDMM可以做随机块坐标下降重叠块。实验结果表明,PDMM在鲁棒主成分分析和重叠组套索两个应用中的性能优于最先进的方法。

英文摘要:

We consider the problem of minimizing block-separable convex functions subject to linear constraints. While the Alternating Direction Method of Multipliers (ADMM) for two-block linear constraints has been intensively studied both theoretically and empirically, in spite of some preliminary work, effective generalizations of ADMM to multiple blocks is still unclear. In this paper, we propose a randomized block coordinate method named Parallel Direction Method of Multipliers (PDMM) to solve the optimization problems with multi-block linear constraints. PDMM randomly updates some primal and dual blocks in parallel, behaving like parallel randomized block coordinate descent. We establish the global convergence and the iteration complexity for PDMM with constant step size. We also show that PDMM can do randomized block coordinate descent on overlapping blocks. Experimental results show that PDMM performs better than state-of-the-arts methods in two applications, robust principal component analysis and overlapping group lasso.

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