2022

Rethinking Graph Neural Networks for Anomaly Detection

Tang, Jianheng, Li, Jiajin, Gao, Ziqi et al.

Understand

Graph Neural Networks (GNNs) are widely applied for graph anomaly detection.

  • As one of the key components for GNN design is to select a tailored spectral filter, we take the first step towards analyzing anomalies via the lens of the graph spectrum.
  • Our crucial observation is the existence of anomalies will lead to the `right-shift' phenomenon, that is, the spectral energy distribution concentrates less on low frequencies and more on high frequencies.
  • This fact motivates us to propose the Beta Wavelet Graph Neural Network (BWGNN).

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