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arXiv 0912.4571math.OCcs.CVcs.NAmath.NA
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最小化两个凸函数和的快速交替线性化方法

Fast Alternating Linearization Methods for Minimizing the Sum of Two Convex Functions

Columbia University(哥伦比亚大学);Lehigh University(理海大学)

Donald Goldfarb, Shiqian Ma, Katya Scheinberg

AI总结:

提出基于交替方向增广拉格朗日方法的一阶交替线性化算法,用于最小化两个凸函数的和,基本方法需O(1/ε)次迭代达到ε-最优解,加速版本需O(1/√ε)次迭代,并给出数值结果。

摘要:

本文提出基于交替方向增广拉格朗日方法的一阶交替线性化算法,用于最小化两个凸函数的和。我们的基本方法最多需要$O(1/ε)$次迭代即可获得$ε$-最优解,而加速(即快速)版本最多需要$O(1/\sqrtε)$次迭代,且每次迭代的计算量变化很小。对于这两种方法,我们提出了一种要求两个函数均具有Lipschitz连续梯度的光滑性的算法,以及一种仅要求其中一个函数具有该性质的算法。本文中的算法是Gauss-Seidel型方法,与Goldfarb和Ma在[21]中提出的Jacobi型方法形成对比。数值结果支持了我们的理论结论,并展示了算法的实际潜力。

英文摘要:

We present in this paper first-order alternating linearization algorithms based on an alternating direction augmented Lagrangian approach for minimizing the sum of two convex functions. Our basic methods require at most $O(1/ε)$ iterations to obtain an $ε$-optimal solution, while our accelerated (i.e., fast) versions of them require at most $O(1/\sqrtε)$ iterations, with little change in the computational effort required at each iteration. For both types of methods, we present one algorithm that requires both functions to be smooth with Lipschitz continuous gradients and one algorithm that needs only one of the functions to be so. Algorithms in this paper are Gauss-Seidel type methods, in contrast to the ones proposed by Goldfarb and Ma in [21] where the algorithms are Jacobi type methods. Numerical results are reported to support our theoretical conclusions and demonstrate the practical potential of our algorithms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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