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Correction to: Structural analysis of water networks 修正:水网结构分析
IF 2.1 4区 数学 Q2 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-02-01 DOI: 10.1093/comnet/cnad008
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引用次数: 0
A method based on link prediction for identifying set of super-spreaders in complex networks 一种基于链路预测的复杂网络超传播者集识别方法
IF 2.1 4区 数学 Q2 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-02-01 DOI: 10.1093/comnet/cnad007
Bayan Hosseini;Farshid Veisi;Amir Sheikhahmdi
Identifying a group of key nodes with enormous capability for spreading information to other network nodes is one of the favourable research topics in complex networks. In most existing methods, only the current status of the network is used for identifying and selecting the member of these groups. The main weakness of these methods is a lack of attention to the highly dynamic nature of complex networks and continuous changes in them in terms of creating and eliminating nodes and links. This matter makes the selected group have no proper performance in spreading information relative to other nodes. Therefore, this article presents a novel method for identifying spreader nodes and selecting a superior set from them. In the proposed method, the diffusion power of network nodes is calculated in the first step, and some are selected as influential nodes. In the following steps, it is tried to modify the list of selected nodes by predicting the network variation. Six datasets gathered from real-world networks are utilized for evaluation. The proposed method and other methods are tested to evaluate their spread of influence and time complexity. Results show that using the link prediction in the proposed method can enhance the spread of influence by the selected set compared to other methods so that the spread of influence in some datasets is more than 30$%$. On the other hand, the time complexity of the proposed method confirms its utility in very large networks.
在复杂网络中,识别一组具有向其他网络节点传播信息能力的关键节点是一个重要的研究课题。在大多数现有方法中,仅使用网络的当前状态来识别和选择这些组的成员。这些方法的主要缺点是缺乏对复杂网络的高度动态性以及它们在创建和消除节点和链接方面的持续变化的关注。这一问题使得所选组相对于其他节点的信息传播性能不佳。因此,本文提出了一种识别扩散节点并从中选择优集的新方法。在该方法中,首先计算网络节点的扩散能力,并选择一些有影响的节点。在接下来的步骤中,尝试通过预测网络变化来修改所选节点的列表。从现实世界的网络中收集的六个数据集被用于评估。对该方法和其他方法进行了测试,以评估其影响范围和时间复杂度。结果表明,与其他方法相比,该方法中使用链接预测可以增强所选数据集的影响力传播,某些数据集的影响力传播超过30 %。另一方面,该方法的时间复杂度证实了它在非常大的网络中的实用性。
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引用次数: 1
A machine-learning procedure to detect network attacks 检测网络攻击的机器学习程序
IF 2.1 4区 数学 Q2 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS Pub Date : 2023-01-15 DOI: 10.1093/comnet/cnad017
Davide Coppes, P. Cermelli
The goal of this note is to assess whether simple machine learning algorithms can be used to determine whether and how a given network has been attacked. The procedure is based on the $k$-Nearest Neighbor and the Random Forest classification schemes, using both intact and attacked ErdH{o}s-R'enyi, Barabasi-Albert and Watts-Strogatz networks to train the algorithm. The types of attacks we consider here are random failures and maximum-degree or maximum-betweenness node deletion. Each network is characterized by a list of 4 metrics, namely the normalized reciprocal maximum degree, the global clustering coefficient, the normalized average path length and the assortativity: a statistical analysis shows that this list of graph metrics is indeed significantly different in intact or damaged networks. We test the procedure by choosing both artificial and real networks, performing the attacks and applying the classification algorithms to the resulting graphs: the procedure discussed here turns out to be able to distinguish between intact networks and those attacked by the maximum-degree of maximum-betweenness deletions, but cannot detect random failures. Our results suggest that this approach may provide a basis for the analysis and detection of network attacks.
本文的目的是评估是否可以使用简单的机器学习算法来确定给定网络是否受到攻击以及如何受到攻击。该过程基于$k$-最近邻和随机森林分类方案,使用完整和攻击的ErdH{o} - r enyi, barabsi - albert和Watts-Strogatz网络来训练算法。我们在这里考虑的攻击类型是随机故障和最大程度或最大间隔节点删除。每个网络都有一个包含4个指标的列表来表征,即归一化倒最大度、全局聚类系数、归一化平均路径长度和分类度:统计分析表明,这一列表的图指标在完整或损坏的网络中确实有显著差异。我们通过选择人工网络和真实网络,执行攻击并将分类算法应用于结果图来测试该过程:这里讨论的过程能够区分完整网络和被最大间数删除的最大程度攻击的网络,但不能检测随机故障。我们的研究结果表明,这种方法可以为分析和检测网络攻击提供基础。
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引用次数: 0
Correlation distances in social networks 社交网络中的相关距离
IF 2.1 4区 数学 Q2 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS Pub Date : 2022-12-21 DOI: 10.1093/comnet/cnad016
Pádraig MacCarron, Shane Mannion, T. Platini
In this work we explore degree assortativity in complex networks, and extend its usual definition beyond that of nearest neighbours. We apply this definition to model networks, and describe a rewiring algorithm that induces assortativity. We compare these results to real networks. Social networks in particular tend to be assortatively mixed by degree in contrast to many other types of complex networks. However, we show here that these positive correlations diminish after one step and in most of the empirical networks analysed. Properties besides degree support this, such as the number of papers in scientific coauthorship networks, with no correlations beyond nearest neighbours. Beyond next-nearest neighbours we also observe a diasassortative tendency for nodes three steps away indicating that nodes at that distance are more likely different than similar.
在这项工作中,我们探索了复杂网络中的程度分类,并将其通常的定义扩展到最近邻的定义之外。我们将这一定义应用于网络模型,并描述了一种诱导分类的重新布线算法。我们将这些结果与真实网络进行比较。与许多其他类型的复杂网络相比,社会网络尤其倾向于按程度分类混合。然而,我们在这里表明,这些正相关性在一步后减少,并在大多数实证网络分析。除了程度之外,其他属性也支持这一点,比如科学合作网络中的论文数量,除了近邻之外没有相关性。除了最近的邻居之外,我们还观察到距离三步远的节点的非分类趋势,表明该距离的节点更有可能不同而不是相似。
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引用次数: 0
A robust method for fitting degree distributions of complex networks 复杂网络度分布拟合的鲁棒方法
IF 2.1 4区 数学 Q2 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS Pub Date : 2022-12-13 DOI: 10.1093/comnet/cnad023
Shane Mannion, Pádraig MacCarron
This work introduces a method for fitting to the degree distributions of complex network datasets, such that the most appropriate distribution from a set of candidate distributions is chosen while maximizing the portion of the distribution to which the model is fit. Current methods for fitting to degree distributions in the literature are inconsistent and often assume a priori what distribution the data are drawn from. Much focus is given to fitting to the tail of the distribution, while a large portion of the distribution below the tail is ignored. It is important to account for these low degree nodes, as they play crucial roles in processes such as percolation. Here we address these issues, using maximum likelihood estimators to fit to the entire dataset, or close to it. This methodology is applicable to any network dataset (or discrete empirical dataset), and we test it on over 25 network datasets from a wide range of sources, achieving good fits in all but a few cases. We also demonstrate that numerical maximization of the likelihood performs better than commonly used analytical approximations. In addition, we have made available a Python package which can be used to apply this methodology.
这项工作介绍了一种拟合复杂网络数据集的度分布的方法,这样就可以从一组候选分布中选择最合适的分布,同时最大化模型拟合的分布部分。目前文献中拟合程度分布的方法是不一致的,并且通常假设数据是从什么分布中提取的先验。大部分的重点放在拟合分布的尾部,而忽略了尾部以下的大部分分布。考虑这些低度节点是很重要的,因为它们在渗流等过程中起着至关重要的作用。在这里,我们解决这些问题,使用最大似然估计器来拟合整个数据集,或接近它。这种方法适用于任何网络数据集(或离散经验数据集),我们在来自广泛来源的超过25个网络数据集上进行了测试,除了少数情况外,在所有情况下都取得了良好的拟合。我们还证明,数值最大化的似然执行比常用的解析近似更好。此外,我们还提供了一个Python包,可用于应用此方法。
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引用次数: 0
Tractability of L2-approximation and integration in weighted Hermite spaces of finite smoothness 有限光滑加权Hermite空间中l2逼近与积分的可跟踪性
IF 2.1 4区 数学 Q2 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS Pub Date : 2022-12-12 DOI: 10.48550/arXiv.2212.05780
G. Leobacher, F. Pillichshammer, Adrian Ebert
In this paper we consider integration and $L_2$-approximation for functions over $RR^s$ from weighted Hermite spaces. The first part of the paper is devoted to a comparison of several weighted Hermite spaces that appear in literature, which is interesting on its own. Then we study tractability of the integration and $L_2$-approximation problem for the introduced Hermite spaces, which describes the growth rate of the information complexity when the error threshold $varepsilon$ tends to 0 and the problem dimension $s$ grows to infinity. Our main results are characterizations of tractability in terms of the involved weights, which model the importance of the successive coordinate directions for functions from the weighted Hermite spaces.
本文研究了加权Hermite空间中$RR^s$上函数的积分和$L_2$逼近问题。论文的第一部分致力于比较文学中出现的几个加权赫米特空间,这本身就很有趣。然后研究了引入的Hermite空间的积分和$L_2$逼近问题的可跟踪性,描述了误差阈值$ varepsilon$趋近于0,问题维数$s$趋近于无穷时信息复杂度的增长速度。我们的主要结果是根据所涉及的权重来描述可跟踪性,这对来自加权Hermite空间的函数的连续坐标方向的重要性进行了建模。
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引用次数: 1
A cosine rule-based discrete sectional curvature for graphs 基于余弦规则的离散截面曲率图
IF 2.1 4区 数学 Q2 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS Pub Date : 2022-12-02 DOI: 10.1093/comnet/cnad022
J. D. Plessis, X. Arsiwalla
How does one generalize differential geometric constructs such as curvature of a manifold to the discrete world of graphs and other combinatorial structures? This problem carries significant importance for analyzing models of discrete spacetime in quantum gravity; inferring network geometry in network science; and manifold learning in data science. The key contribution of this paper is to introduce and validate a new estimator of discrete sectional curvature for random graphs with low metric-distortion. The latter are constructed via a specific graph sprinkling method on different manifolds with constant sectional curvature. We define a notion of metric distortion, which quantifies how well the graph metric approximates the metric of the underlying manifold. We show how graph sprinkling algorithms can be refined to produce hard annulus random geometric graphs with minimal metric distortion. We construct random geometric graphs for spheres, hyperbolic and euclidean planes; upon which we validate our curvature estimator. Numerical analysis reveals that the error of the estimated curvature diminishes as the mean metric distortion goes to zero, thus demonstrating convergence of the estimate. We also perform comparisons to other existing discrete curvature measures. Finally, we demonstrate two practical applications: (i) estimation of the earth's radius using geographical data; and (ii) sectional curvature distributions of self-similar fractals.
如何将诸如流形曲率之类的微分几何构造推广到图形和其他组合结构的离散世界?这个问题对于分析量子引力中的离散时空模型具有重要意义;网络科学中的网络几何推理以及数据科学中的多元学习。本文的主要贡献是引入并验证了一种新的低度量失真随机图的离散截面曲率估计。后者是在不同截面曲率不变的流形上,通过一种特殊的图喷洒方法来构造的。我们定义了度量失真的概念,它量化了图形度量近似底层流形的度量的程度。我们展示了如何改进图形喷洒算法,以产生具有最小度量失真的硬环随机几何图形。我们构造了球面、双曲平面和欧几里得平面的随机几何图;在此基础上我们验证曲率估计。数值分析表明,估计曲率的误差随着平均度规畸变趋近于零而减小,从而证明了估计的收敛性。我们还与其他现有的离散曲率度量进行了比较。最后,我们展示了两个实际应用:(i)利用地理数据估计地球半径;(ii)自相似分形的截面曲率分布。
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引用次数: 2
Sampling numbers of smoothness classes via 𝓁1-minimization 通过𝓁1-minimization获取平滑度类的采样数
IF 2.1 4区 数学 Q2 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS Pub Date : 2022-12-01 DOI: 10.48550/arXiv.2212.00445
Thomas Jahn, T. Ullrich, Felix Voigtländer
Using techniques developed recently in the field of compressed sensing we prove new upper bounds for general (nonlinear) sampling numbers of (quasi-)Banach smoothness spaces in $L^2$. In particular, we show that in relevant cases such as mixed and isotropic weighted Wiener classes or Sobolev spaces with mixed smoothness, sampling numbers in $L^2$ can be upper bounded by best $n$-term trigonometric widths in $L^infty$. We describe a recovery procedure from $m$ function values based on $ell^1$-minimization (basis pursuit denoising). With this method, a significant gain in the rate of convergence compared to recently developed linear recovery methods is achieved. In this deterministic worst-case setting we see an additional speed-up of $m^{-1/2}$ (up to log factors) compared to linear methods in case of weighted Wiener spaces. For their quasi-Banach counterparts even arbitrary polynomial speed-up is possible. Surprisingly, our approach allows to recover mixed smoothness Sobolev functions belonging to $S^r_pW(mathbb{T}^d)$ on the $d$-torus with a logarithmically better rate of convergence than any linear method can achieve when $1
利用压缩感知领域最新发展的技术,我们证明了$L^2$中(拟-)Banach平滑空间的一般(非线性)采样数的新上界。特别地,我们证明了在相关的情况下,如混合和各向同性加权Wiener类或具有混合平滑性的Sobolev空间中,$L^2$中的采样数可以被$L^ inty $中的最佳$n$项三角宽度的上界。我们描述了基于$ well ^1$最小化(基追求去噪)的$m$函数值的恢复过程。与最近开发的线性恢复方法相比,这种方法的收敛速度有了显著的提高。在这种确定的最坏情况设置中,我们看到与加权Wiener空间的线性方法相比,$m^{-1/2}$(高达对数因子)的额外加速。对于它们的拟巴拿赫对应物,甚至任意多项式加速是可能的。令人惊讶的是,我们的方法允许在$d$-环面上恢复属于$S^r_pW(mathbb{T}^d)$的混合平滑Sobolev函数,其收敛速度比任何线性方法在$1时都要高
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引用次数: 8
Improving mean-field network percolation models with neighbourhood information and their limitations on highly modular, highly dispersed networks 基于邻域信息的平均场网络渗透模型的改进及其在高度模块化、高度分散网络中的局限性
IF 2.1 4区 数学 Q2 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS Pub Date : 2022-11-04 DOI: 10.48550/arXiv.2211.02346
Chris Jones, K. Wiesner
Mean field theory models of percolation on networks provide analytic estimates of network robustness under node or edge removal. We introduce a new mean field theory model based on generating functions that includes information about the tree-likeness of each node's local neighbourhood. We show that our new model outperforms all other generating function models in prediction accuracy when testing their estimates on a wide range of real-world network data. We compare the new model's performance against the recently introduced message passing models and provide evidence that the standard version is also outperformed, while the `loopy' version is only outperformed on a targeted attack strategy. As we show, however, the computational complexity of our model implementation is much lower than that of message passing algorithms. We provide evidence that all discussed models are poor in predicting networks with highly modular structure with dispersed modules, which are also characterised by high mixing times, identifying this as a general limitation of percolation prediction models.
网络渗透的平均场理论模型提供了节点或边缘去除下网络鲁棒性的分析估计。我们引入了一种新的基于生成函数的平均场理论模型,该模型包含了每个节点局部邻域的树形信息。当在广泛的真实网络数据上测试它们的估计时,我们表明我们的新模型在预测精度方面优于所有其他生成函数模型。我们将新模型的性能与最近引入的消息传递模型进行比较,并提供证据表明标准版本也优于标准版本,而“循环”版本仅在有针对性的攻击策略上优于标准版本。然而,正如我们所展示的,我们的模型实现的计算复杂度远低于消息传递算法。我们提供的证据表明,所有讨论的模型在预测具有分散模块的高度模块化结构的网络时都很差,这些模块也具有高混合时间的特征,并将其确定为渗透预测模型的一般限制。
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引用次数: 1
Hypergraph Artificial Benchmark for Community Detection (h-ABCD) 社区检测的超图人工基准
IF 2.1 4区 数学 Q2 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS Pub Date : 2022-10-26 DOI: 10.48550/arXiv.2210.15009
Bogumil Kami'nski, P. Prałat, F. Théberge
The Artificial Benchmark for Community Detection (ABCD) graph is a recently introduced random graph model with community structure and power-law distribution for both degrees and community sizes. The model generates graphs with similar properties as the well-known Lancichinetti, Fortunato, Radicchi (LFR) one, and its main parameter ξ can be tuned to mimic its counterpart in the LFR model, the mixing parameter μ. In this article, we introduce hypergraph counterpart of the ABCD model, h–ABCD, which also produces random hypergraph with distributions of ground-truth community sizes and degrees following power-law. As in the original ABCD, the new model h–ABCD can produce hypergraphs with various levels of noise. More importantly, the model is flexible and can mimic any desired level of homogeneity of hyperedges that fall into one community. As a result, it can be used as a suitable, synthetic playground for analyzing and tuning hypergraph community detection algorithms. [Received on 22 October 2022; editorial decision on 18 July 2023; accepted on 19 July 2023]
ABCD (Artificial Benchmark for Community Detection)图是近年来提出的一种随机图模型,它具有社团结构和社团大小的幂律分布。该模型生成的图与著名的Lancichinetti, Fortunato, Radicchi (LFR)模型具有相似的性质,并且其主要参数ξ可以被调整以模拟LFR模型中的对应参数,即混合参数μ。在本文中,我们引入了ABCD模型的对应超图h-ABCD, h-ABCD也产生了基于真值社区大小和度服从幂律分布的随机超图。与原来的ABCD一样,新模型h-ABCD可以产生具有不同程度噪声的超图。更重要的是,该模型是灵活的,可以模拟属于一个社区的任何期望级别的超边缘同质性。因此,它可以作为一个合适的综合平台,用于分析和调优超图社区检测算法。[2022年10月22日收到;2023年7月18日的编辑决定;于2023年7月19日接受]
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引用次数: 4
期刊
Journal of complex networks
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