论文标题
在加权模块化复合网络中提取骨干
Extracting Backbones in Weighted Modular Complex Networks
论文作者
论文摘要
网络科学提供了建模和分析复杂系统的有效工具。但是,现实世界网络的规模不断增长成为一个主要障碍,以了解其结构和拓扑特征。因此,将原始网络映射到较小的网络的同时保留其信息是一个重要的问题。提取网络的所谓骨干是一个非常具有挑战性的问题,通常通过粗粒或基于滤波器的方法来处理。粗粒方法通过分组相似的节点来减少网络大小,而基于过滤器的方法通过基于统计属性丢弃节点或边缘来修剪网络。在本文中,我们提出并研究了利用重叠社区结构的两种基于过滤器的方法,以便在加权网络中提取骨干。实际上,高度连接的节点(集线器)和重叠的节点是网络的核心。在第一种方法中,称为“重叠节点自我主链”,骨干仅由一组重叠的节点及其邻居形成。在第二种方法中,称为“重叠节点和轮毂骨架”,骨干是由重叠的节点和轮毂组形成的。对于这两种方法,只要保留带有单个连接组件的骨架,就可以从网络中删除具有最低权重的链接。实验是在源自各个领域(社交,共同出现,协作,生物学和技术)和不同大小的现实加权网络上进行的。结果表明,这两种骨干提取方法都非常相似。此外,与最有影响力的替代滤波方法的比较表明,提议的骨干提取方法揭示网络最相关的部分的能力更大。
Network science provides effective tools to model and analyze complex systems. However, the increasing size of real-world networks becomes a major hurdle in order to understand their structure and topological features. Therefore, mapping the original network into a smaller one while preserving its information is an important issue. Extracting the so-called backbone of a network is a very challenging problem that is generally handled either by coarse-graining or filter-based methods. Coarse-graining methods reduce the network size by grouping similar nodes, while filter-based methods prune the network by discarding nodes or edges based on a statistical property. In this paper, we propose and investigate two filter-based methods exploiting the overlapping community structure in order to extract the backbone in weighted networks. Indeed, highly connected nodes (hubs) and overlapping nodes are at the heart of the network. In the first method, called "overlapping nodes ego backbone", the backbone is formed simply from the set of overlapping nodes and their neighbors. In the second method, called "overlapping nodes and hubs backbone", the backbone is formed from the set of overlapping nodes and the hubs. For both methods, the links with the lowest weights are removed from the network as long as a backbone with a single connected component is preserved. Experiments have been performed on real-world weighted networks originating from various domains (social, co-appearance, collaboration, biological, and technological) and different sizes. Results show that both backbone extraction methods are quite similar. Furthermore, comparison with the most influential alternative filtering method demonstrates the greater ability of the proposed backbones extraction methods to uncover the most relevant parts of the network.