arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1907.04733cs.DS
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有界树宽图聚类的核心集

Coresets for Clustering in Graphs of Bounded Treewidth

Daniel Baker, Vladimir Braverman, Lingxiao Huang, Shaofeng H. -C. Jiang, Robert Krauthgamer, Xuan Wu

摘要:

我们开始研究图度量中的聚类核心集,即,边权图的最短路度量这种聚类问题对于数据分析是必不可少的,例如用于道路网络和数据可视化。核心集是数据的紧凑摘要,近似地保留了每个可能的中心集的聚类目标,并且它在运行时间,存储和通信方面提供了显着的效率改进,包括在流和分布式设置中。我们的主要结果是一个近线性的时间结构的coreset的k-中位数在一般图$G$,大小为$O_{ε, k}(\mathrm{tw}(G))$,其中$\mathrm{tw}(G)$是树的宽度$G$,我们补充建设与一个接近紧的大小下限。该结构基于Feldman和Langberg [STOC 2011]的框架,根据该框架的要求,我们的主要技术贡献是在任何点权重下破碎维度上的$O(\mathrm{tw}(G))$的统一界。我们验证了我们的coreset在现实世界的道路网络,我们的可扩展算法构造微小的coreset具有高精度,这转化为现有的近似算法,如本地搜索图k-中位数的大规模加速。

英文摘要:

We initiate the study of coresets for clustering in graph metrics, i.e., the shortest-path metric of edge-weighted graphs. Such clustering problems are essential to data analysis and used for example in road networks and data visualization. A coreset is a compact summary of the data that approximately preserves the clustering objective for every possible center set, and it offers significant efficiency improvements in terms of running time, storage, and communication, including in streaming and distributed settings. Our main result is a near-linear time construction of a coreset for k-Median in a general graph $G$, with size $O_{ε, k}(\mathrm{tw}(G))$ where $\mathrm{tw}(G)$ is the treewidth of $G$, and we complement the construction with a nearly-tight size lower bound. The construction is based on the framework of Feldman and Langberg [STOC 2011], and our main technical contribution, as required by this framework, is a uniform bound of $O(\mathrm{tw}(G))$ on the shattering dimension under any point weights. We validate our coreset on real-world road networks, and our scalable algorithm constructs tiny coresets with high accuracy, which translates to a massive speedup of existing approximation algorithms such as local search for graph k-Median.

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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