arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1807.09302cs.DS
收藏

基于线性采样的度量次线性算法

Metric Sublinear Algorithms via Linear Sampling

Hossein Esfandiari, Michael Mitzenmacher

摘要:

在这项工作中,我们提供了一种新的技术来设计快速的近似算法的图形问题的点位于度量空间。具体来说,我们提出了一个采样方法,这样的度量图,使用一个次线性数量的边缘权重查询,提供了一个{ \em线性采样},其中每个边缘(粗略地说)采样成比例的重量。对于几个自然的问题,如densorable子图和最大割等,我们表明,通过稀疏化的图使用这种采样过程,我们可以运行一个合适的近似算法的稀疏化的图和结果仍然是一个很好的近似原问题。我们的结果有几个有趣的含义,如提供了一个度量空间中的denial子图的第一次次线性时间近似算法,并改善估计平均距离的运行时间。

英文摘要:

In this work we provide a new technique to design fast approximation algorithms for graph problems where the points of the graph lie in a metric space. Specifically, we present a sampling approach for such metric graphs that, using a sublinear number of edge weight queries, provides a {\em linear sampling}, where each edge is (roughly speaking) sampled proportionally to its weight. For several natural problems, such as densest subgraph and max cut among others, we show that by sparsifying the graph using this sampling process, we can run a suitable approximation algorithm on the sparsified graph and the result remains a good approximation for the original problem. Our results have several interesting implications, such as providing the first sublinear time approximation algorithm for densest subgraph in a metric space, and improving the running time of estimating the average distance.

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。

↑