arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.00252math.OCcs.SYeess.SY
收藏

分布式非凸优化:无梯度迭代与ε-全局最优解

Distributed Nonconvex Optimization: Gradient-free Iterations and $ε$-Globally Optimal Solution

Zhiyu He, Jianping He, Cailian Chen, Xinping Guan

AI总结:

本文针对带约束的分布式非凸优化问题,提出结合切比雪夫多项式逼近、平均一致性和多项式优化的CPCA算法,实现无梯度迭代下的ε-全局最优解,并保证查询与通信高效及可分布式终止。

摘要:

分布式优化利用局部计算和通信来实现对局部目标函数之和进行优化的全局目标。本文研究一类涉及单变量目标的带约束分布式非凸优化问题,旨在无需在每次迭代中进行局部梯度评估的情况下实现全局优化。我们提出了一种名为CPCA的新算法,该算法利用了切比雪夫多项式逼近、平均一致性和多项式优化相结合的思想。所提算法能够:i) 对任意给定的小精度ε获得ε-全局最优解;ii) 在零阶查询(即函数值评估)和智能体间通信两方面均具有高效性;iii) 在满足指定精度要求时可分布式终止。其关键思想是利用多项式逼近替代一般的局部目标函数,通过平均一致性分发这些逼近,并求解原问题的一个更易处理的近似版本。由于多项式具有良好的解析性质,这种逼近不仅有助于实现高效的全局优化,还允许设计无梯度迭代以降低查询的累积成本,并在求解非凸问题时实现几何收敛。我们对所提算法的精度和复杂度进行了全面分析。

英文摘要:

Distributed optimization utilizes local computation and communication to realize a global aim of optimizing the sum of local objective functions. This article addresses a class of constrained distributed nonconvex optimization problems involving univariate objectives, aiming to achieve global optimization without requiring local evaluations of gradients at every iteration. We propose a novel algorithm named CPCA, exploiting the notion of combining Chebyshev polynomial approximation, average consensus, and polynomial optimization. The proposed algorithm is i) able to obtain $ε$-globally optimal solutions for any arbitrarily small given accuracy $ε$, ii) efficient in both zeroth-order queries (i.e., evaluations of function values) and inter-agent communication, and iii) distributed terminable when the specified precision requirement is met. The key insight is to use polynomial approximations to substitute for general local objectives, distribute these approximations via average consensus, and solve an easier approximate version of the original problem. Due to the nice analytic properties of polynomials, this approximation not only facilitates efficient global optimization, but also allows the design of gradient-free iterations to reduce cumulative costs of queries and achieve geometric convergence for solving nonconvex problems. We provide a comprehensive analysis of the accuracy and complexities of the proposed algorithm.

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。

↑