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arXiv 2009.09135math.OC
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加速Optimization流的资源感知离散化

Resource-Aware Discretization of Accelerated Optimization Flows

Miguel Vaquero, Pol Mestres, Jorge Cortés

摘要:

本文处理的问题,离散化加速优化流,同时保持其收敛性能。受到资源感知控制在数字系统上开发高效闭环反馈实现的成功的启发,我们将系统的最后采样状态视为要感知的资源。由此产生的可变步长离散时间算法保留设计所需的减少其连续时间的李雅普诺夫证书。我们的算法设计采用了各种概念和技术,从资源感知控制,在目前的情况下,有有趣的并行与离散时间实现的优化算法。这些措施包括衍生物和性能为基础的触发器,以监测的演变的李雅普诺夫函数作为一种方式来确定算法的步长,利用采样信息,以提高算法的性能,并采用高阶保持使用更准确的积分器的原始动态。在整个文件中,我们说明了我们的方法上一个新引入的连续时间动态称为重球动态位移梯度,但这里提出的想法具有广泛的适用性,其他全球渐近稳定流赋予了李雅普诺夫证明。

英文摘要:

This paper tackles the problem of discretizing accelerated optimization flows while retaining their convergence properties. Inspired by the success of resource-aware control in developing efficient closed-loop feedback implementations on digital systems, we view the last sampled state of the system as the resource to be aware of. The resulting variable-stepsize discrete-time algorithms retain by design the desired decrease of the Lyapunov certificate of their continuous-time counterparts. Our algorithm design employs various concepts and techniques from resource-aware control that, in the present context, have interesting parallelisms with the discrete-time implementation of optimization algorithms. These include derivative- and performance-based triggers to monitor the evolution of the Lyapunov function as a way of determining the algorithm stepsize, exploiting sampled information to enhance algorithm performance, and employing high-order holds using more accurate integrators of the original dynamics. Throughout the paper, we illustrate our approach on a newly introduced continuous-time dynamics termed heavy-ball dynamics with displaced gradient, but the ideas proposed here have broad applicability to other globally asymptotically stable flows endowed with a Lyapunov certificate.

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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