arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.01400cs.DScs.LG
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局部搜索算法的近似性保证

Approximation Guarantees of Local Search Algorithms via Localizability of Set Functions

National Institute of Informatics(国立信息学研究所)

Kaito Fujii

摘要:

本文提出了一个新的框架,提供近似保证的局部搜索算法。局部搜索是一种基本的算法设计技术,广泛应用于各种组合优化问题。为了分析集函数最大化的局部搜索算法,我们提出了一个新的概念,称为集函数的局部化能力,它衡量局部改进的有效性。此外,我们提供了近似保证标准的局部搜索算法在各种组合约束条件下的局部化。我们的框架的主要应用是稀疏优化,我们表明,限制性强的光滑性和限制性的目标函数意味着本地化,并进一步发展本地搜索算法的加速版本。我们在稀疏回归和图模型的结构学习中进行实验,以确认所提出的局部搜索算法的实际效率。

英文摘要:

This paper proposes a new framework for providing approximation guarantees of local search algorithms. Local search is a basic algorithm design technique and is widely used for various combinatorial optimization problems. To analyze local search algorithms for set function maximization, we propose a new notion called localizability of set functions, which measures how effective local improvement is. Moreover, we provide approximation guarantees of standard local search algorithms under various combinatorial constraints in terms of localizability. The main application of our framework is sparse optimization, for which we show that restricted strong concavity and restricted smoothness of the objective function imply localizability, and further develop accelerated versions of local search algorithms. We conduct experiments in sparse regression and structure learning of graphical models to confirm the practical efficiency of the proposed local search 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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