Parsimonious formulations for low-diameter clusters

Parsimonious formulations for low-diameter clusters
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低直径簇的简约公式

DOI:
10.1007/s12532-020-00175-6
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发表时间:
2020
影响因子:
6.3
通讯作者:
Buchanan, Austin
Buchanan, Austin
中科院分区:
数学2区
文献类型:
--
作者:
Salemi, Hosseinali;Buchanan, Austin

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在网络分析中,人们经常寻找紧密结合的集群。一个“好”的星系团的一个特性是直径小(比如说,bounded byk),这就引出了ak-俱乐部的概念。在本文中,我们提出了新的路径和切割的整数规划公式检测这些低直径的子图。他们简化,概括,和/或主导几个先前存在的配方。我们表现最好的配方只使用节点变量(与以前的配方完全不同),并通过一个指数级大类的切割式不等式施加直径最大k约束。类似切割的公式的相对简单的实现很容易优于以前的方法,可以在一两秒钟内解决数十个最大俱乐部问题的实例,而其他公式则需要数小时。此外,切割式公式更一般,因为它甚至在距离不是以跳数来测量时也适用。虽然我们在本文中只考虑k俱乐部问题,但所提出的技术也可能在紧凑解决方案是关键的其他应用中有用(例如,政治区划和野生动物保护区设计)。
In the analysis of networks, one often searches for tightly knit clusters. One property of a “good” cluster is a small diameter (say, bounded byk), which leads to the concept of ak-club. In this paper, we propose new path-like and cut-like integer programming formulations for detecting these low-diameter subgraphs. They simplify, generalize, and/or dominate several previously existing formulations. Our best-performing formulation uses only node variables (quite unlike previous formulations) and imposes the diameter-at-most-kconstraints via an exponentially large class of cut-like inequalities. A relatively simple implementation of the cut-like formulation easily outperforms previous approaches, solving dozens of instances of the maximumk-club problem in a second or two that would take hours by other formulations. Moreover, the cut-like formulation is more general in the sense that it applies even when distances are not measured in terms of hops. While we consider only thek-club problem in this paper, the proposed techniques may also be useful in other applications where compact solutions are key (e.g., political districting and wildlife reserve design).
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