arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1602.01716math.OCcs.ITmath.IT
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网络化时变凸优化的分散预测校正方法

Decentralized Prediction-Correction Methods for Networked Time-Varying Convex Optimization

Andrea Simonetto, Alec Koppel, Aryan Mokhtari, Geert Leus, Alejandro Ribeiro

摘要:

我们开发的算法,发现和跟踪的时变凸优化问题,其中包括本地和网络相关的目标的最优解轨迹。该算法来自预测校正方法,其对应于一种策略,其中时变问题在离散时间实例处被采样,然后通过交替地执行关于下一时间样本处的优化器如何改变的预测和关于它们实际上如何改变的校正来生成序列。预测基于最优性条件如何随时间演变,而校正基于梯度或牛顿法,从而产生分散预测-校正梯度(DPC-G)和分散预测-校正牛顿(DPC-N)。我们将这些方法扩展到优化程序如何随时间变化的知识只是近似的情况,并提出了分散式近似预测-校正梯度(DAPC-G)和分散式近似预测-校正牛顿(DAPC-N)。所有提出的方法的收敛特性进行了研究,并在无线网络中的资源分配问题的应用上显示经验性能。我们观察到,所提出的方法优于现有的运行算法的数量级。数值结果显示收敛精度,采样周期和网络通信之间的权衡。

英文摘要:

We develop algorithms that find and track the optimal solution trajectory of time-varying convex optimization problems which consist of local and network-related objectives. The algorithms are derived from the prediction-correction methodology, which corresponds to a strategy where the time-varying problem is sampled at discrete time instances and then a sequence is generated via alternatively executing predictions on how the optimizers at the next time sample are changing and corrections on how they actually have changed. Prediction is based on how the optimality conditions evolve in time, while correction is based on a gradient or Newton method, leading to Decentralized Prediction-Correction Gradient (DPC-G) and Decentralized Prediction-Correction Newton (DPC-N). We extend these methods to cases where the knowledge on how the optimization programs are changing in time is only approximate and propose Decentralized Approximate Prediction-Correction Gradient (DAPC-G) and Decentralized Approximate Prediction-Correction Newton (DAPC-N). Convergence properties of all the proposed methods are studied and empirical performance is shown on an application of a resource allocation problem in a wireless network. We observe that the proposed methods outperform existing running algorithms by orders of magnitude. The numerical results showcase a trade-off between convergence accuracy, sampling period, and network communications.

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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