arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.01229cs.LGcs.SIstat.ML
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动态图的拉普拉斯变点检测

Laplacian Change Point Detection for Dynamic Graphs

Mila;McGill University(麦吉尔大学);Université de Montréal(蒙特利尔大学)

Shenyang Huang, Yasmeen Hitti, Guillaume Rabusseau, Reihaneh Rabbany

摘要:

动态图和时态图是丰富的数据结构,用于对实体之间随时间变化的复杂关系进行建模。特别是,在时间图中的异常检测是至关重要的许多现实世界的应用,如入侵识别网络系统中,生态系统的干扰和检测的流行病爆发。在本文中,我们专注于动态图中的变化点检测,并解决与此问题相关的两个主要挑战:I)如何跨时间比较图快照,II)如何捕获时间依赖性。为了解决上述挑战,我们提出了拉普拉斯异常检测(LAD),它使用每个快照的图结构的拉普拉斯矩阵的频谱来获得低维嵌入。LAD通过应用两个滑动窗口显式地对短期和长期依赖性进行建模。在合成实验中,LAD优于最先进的方法。我们还评估了我们的方法在三个真实的动态网络:UCI消息网络,美国参议院共同赞助网络和加拿大法案投票网络。在所有三个数据集中,我们证明了我们的方法可以更有效地根据重要的现实世界事件来识别异常时间点。

英文摘要:

Dynamic and temporal graphs are rich data structures that are used to model complex relationships between entities over time. In particular, anomaly detection in temporal graphs is crucial for many real world applications such as intrusion identification in network systems, detection of ecosystem disturbances and detection of epidemic outbreaks. In this paper, we focus on change point detection in dynamic graphs and address two main challenges associated with this problem: I) how to compare graph snapshots across time, II) how to capture temporal dependencies. To solve the above challenges, we propose Laplacian Anomaly Detection (LAD) which uses the spectrum of the Laplacian matrix of the graph structure at each snapshot to obtain low dimensional embeddings. LAD explicitly models short term and long term dependencies by applying two sliding windows. In synthetic experiments, LAD outperforms the state-of-the-art method. We also evaluate our method on three real dynamic networks: UCI message network, US senate co-sponsorship network and Canadian bill voting network. In all three datasets, we demonstrate that our method can more effectively identify anomalous time points according to significant real world events.

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。

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