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arXiv 1808.04048math.OCstat.ML
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ADMM加速扩张的非光滑动力系统观点

A Nonsmooth Dynamical Systems Perspective on Accelerated Extensions of ADMM

Guilherme França, Daniel P. Robinson, René Vidal

摘要:

最近,人们对连续时间动力系统和最优化方法之间的联系产生了极大的兴趣,特别是在光滑和无约束问题的加速方法方面。在本文中,我们将这一观点扩展到非光滑和约束问题,通过获得微分包含与新的加速变体的交替方向法的乘法器(ADMM)。通过李雅普诺夫分析,我们得出这些动力系统在不同的设置,说明了一个有趣的衰减与常数阻尼策略之间的权衡收敛速度。我们还得到修改后的方程捕捉细粒度的细节,这些方法,提高了稳定性和保持领先的顺序收敛速度。将一般的非线性等式和不等式约束与奇异扰动理论相结合,推广到一般的非线性等式和不等式约束。

英文摘要:

Recently, there has been great interest in connections between continuous-time dynamical systems and optimization methods, notably in the context of accelerated methods for smooth and unconstrained problems. In this paper we extend this perspective to nonsmooth and constrained problems by obtaining differential inclusions associated to novel accelerated variants of the alternating direction method of multipliers (ADMM). Through a Lyapunov analysis, we derive rates of convergence for these dynamical systems in different settings that illustrate an interesting tradeoff between decaying versus constant damping strategies. We also obtain modified equations capturing fine-grained details of these methods, which have improved stability and preserve the leading order convergence rates. An extension to general nonlinear equality and inequality constraints in connection with singular perturbation theory is provided.

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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