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arXiv 1111.5382physics.soc-phcond-mat.stat-mechcs.DScs.SI
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复杂网络中的限幅中心性测度

Range-limited Centrality Measures in Complex Networks

Maria Ercsey-Ravasz, Ryan Lichtenwalter, Nitesh V. Chawla, Zoltan Toroczkai

摘要:

在这里,我们提出了一个范围有限的方法,在非加权和加权有向复杂网络的中心性措施。我们介绍了一种有效的方法,生成每个节点和每个边缘的介数中心的最短路径的长度不长于$\ell = 1,...,L$的情况下,非加权网络的基础上,和加权网络的相应数量的最小权重路径的路径权重不大于$w_{\ell}=\ell Δ$,$\ell=1,2...,L=R/Δ$。这些测量提供了关于节点(边缘)相对于其网络邻域(1步外、2步外等直到包括整个网络)的定位重要性的系统描述。我们发现,范围有限的中心服从普遍的标度律大型非加权网络。由于传统中心性度量的计算成本很高,因此可以利用这种缩放行为来有效地估计所有范围(包括传统范围)的节点和边缘的中心性。缩放行为也可以被利用来表明,基于其范围有限的中心度的节点(边)的排名顶列表根据范围快速冻结,因此可以有效地预测直径范围顶列表。我们还展示了如何估计$N$节点网络的典型最大节点到节点的距离,利用上述缩放行为。这些观察结果在模型网络和从手机跟踪日志($\sim 5.5\times 10^6$节点和$\sim 2.7\times 10^7$边)推断的大型社交网络上进行了说明。最后,我们应用这些概念来有效地检测网络的脆弱性骨干(定义为最高介数节点和边缘的最小聚类),并说明加权网络中基于权重的中心性度量在检测此类骨干中的重要性。

英文摘要:

Here we present a range-limited approach to centrality measures in both non-weighted and weighted directed complex networks. We introduce an efficient method that generates for every node and every edge its betweenness centrality based on shortest paths of lengths not longer than $\ell = 1,...,L$ in case of non-weighted networks, and for weighted networks the corresponding quantities based on minimum weight paths with path weights not larger than $w_{\ell}=\ell Δ$, $\ell=1,2...,L=R/Δ$. These measures provide a systematic description on the positioning importance of a node (edge) with respect to its network neighborhoods 1-step out, 2-steps out, etc. up to including the whole network. We show that range-limited centralities obey universal scaling laws for large non-weighted networks. As the computation of traditional centrality measures is costly, this scaling behavior can be exploited to efficiently estimate centralities of nodes and edges for all ranges, including the traditional ones. The scaling behavior can also be exploited to show that the ranking top-list of nodes (edges) based on their range-limited centralities quickly freezes as function of the range, and hence the diameter-range top-list can be efficiently predicted. We also show how to estimate the typical largest node-to-node distance for a network of $N$ nodes, exploiting the aforementioned scaling behavior. These observations are illustrated on model networks and on a large social network inferred from cell-phone trace logs ($\sim 5.5\times 10^6$ nodes and $\sim 2.7\times 10^7$ edges). Finally, we apply these concepts to efficiently detect the vulnerability backbone of a network (defined as the smallest percolating cluster of the highest betweenness nodes and edges) and illustrate the importance of weight-based centrality measures in weighted networks in detecting such backbones.

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