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arXiv 2006.14403cs.DS
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动态点聚类的近似算法

Approximation Algorithms for Clustering with Dynamic Points

Shichuan Deng, Jian Li, Yuval Rabani

摘要:

我们研究了两个泛化的经典聚类问题,称为动态有序$k$ -中位数和动态$k$ -供应商,需要聚类的点随着时间的推移而发展,我们被允许移动连续的时间步长之间的聚类中心。在这些动态聚类问题中,一般的目标是最小化点的服务成本和中心的移动成本的某些组合,或最小化一个受到一些约束的其他。我们得到了一个常数因子近似算法的动态有序$k$ -中位数在温和的假设下的输入。当时间步数为2时,我们给出了动态$k$ -供应商的3-近似和其离群值的多准则近似,其中一些点可以被丢弃。我们补充几乎匹配的硬度结果的算法。

英文摘要:

We study two generalizations of classic clustering problems called dynamic ordered $k$-median and dynamic $k$-supplier, where the points that need clustering evolve over time, and we are allowed to move the cluster centers between consecutive time steps. In these dynamic clustering problems, the general goal is to minimize certain combinations of the service cost of points and the movement cost of centers, or to minimize one subject to some constraints on the other. We obtain a constant-factor approximation algorithm for dynamic ordered $k$-median under mild assumptions on the input. We give a 3-approximation for dynamic $k$-supplier and a multi-criteria approximation for its outlier version where some points can be discarded, when the number of time steps is two. We complement the algorithms with almost matching hardness results.

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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