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Detection of contextual anomalies in attributed graphs

Abstract : Graph anomaly detection have proved very useful in a wide range of domains. For instance, for detecting anomalous accounts (e.g. bots, terrorists, opinion spammers or social malwares) on online platforms, intrusions and failures on communication networks or suspicious and fraudulent behaviors on social networks. However, most existing methods often rely on pre-selected features built from the graph, do not necessarily use local information and do not consider context based anomalies. To overcome these limits, we present CoBaGAD, a Context-Based Graph Anomaly Detector which exploits local information to detect anomalous nodes of a graph in a semi-supervised way. We use Graph Attention Networks (GAT) with our custom attention mechanism to build local features, aggregate them and classify unlabeled nodes into normal or anomaly. Finally, we show that our algorithm is able to detect anomalies with high precision and recall and, outperforms state-of-theart baselines.
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https://hal-ujm.archives-ouvertes.fr/ujm-03165513
Contributor : Baptiste Jeudy Connect in order to contact the contributor
Submitted on : Thursday, December 9, 2021 - 2:08:14 PM
Last modification on : Sunday, June 26, 2022 - 3:23:54 AM

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Rémi Vaudaine, Baptiste Jeudy, Christine Largeron. Detection of contextual anomalies in attributed graphs. 19th International Symposium on Intelligent Data Analysis, IDA 2021, Apr 2021, Porto, Portugal. ⟨10.1007/978-3-030-74251-5_27⟩. ⟨ujm-03165513⟩

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