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arXiv 1809.08368cs.SIcs.CR
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攻击社交网络中基于相似性的链接预测

Attacking Similarity-Based Link Prediction in Social Networks

Kai Zhou, Tomasz P. Michalak, Talal Rahwan, Marcin Waniek, Yevgeniy Vorobeychik

摘要:

链接预测是计算社会科学的基本问题之一。预测未观察到的链接的存在的一种特别常见的方法是通过结构相似性度量,例如共同邻居的数量;具有较高相似性的节点对因此被认为更有可能被链接。然而,链接预测的许多应用,例如预测帮派或恐怖分子网络中的链接,是对抗性的,另一方被激励通过操纵关于网络的观察信息来最小化其有效性。我们提供了一个全面的算法调查的问题,通过链接删除攻击基于相似性的链接预测,集中在两大类这样的方法,一个只使用本地信息的目标链接,另一个使用全球网络信息。虽然我们展示了几个变化的一般问题是NP-难的本地和全球的指标,我们展示了一些动机良好的特殊情况下,这是易于处理的。此外,我们提供了原则和经验有效的算法的棘手的情况下,在某些情况下证明最坏情况下的近似保证。

英文摘要:

Link prediction is one of the fundamental problems in computational social science. A particularly common means to predict existence of unobserved links is via structural similarity metrics, such as the number of common neighbors; node pairs with higher similarity are thus deemed more likely to be linked. However, a number of applications of link prediction, such as predicting links in gang or terrorist networks, are adversarial, with another party incentivized to minimize its effectiveness by manipulating observed information about the network. We offer a comprehensive algorithmic investigation of the problem of attacking similarity-based link prediction through link deletion, focusing on two broad classes of such approaches, one which uses only local information about target links, and another which uses global network information. While we show several variations of the general problem to be NP-Hard for both local and global metrics, we exhibit a number of well-motivated special cases which are tractable. Additionally, we provide principled and empirically effective algorithms for the intractable cases, in some cases proving worst-case approximation guarantees.

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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