金融犯罪分析のための敵対的にロバストなマルチグラフニューラルネットワークに向けて
Towards Adversarially Robust Multigraph Neural Networks for Financial Crime Analysis
マルチグラフニューラルネットワークに対する構造的敵対攻撃の枠組みと、サイクル正則化を用いた敵対的学習による防御手法を提案し、マネーロンダリング検出での有効性を示した。
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著者: Dennis Heijmans, H. Çağrı Bilgi, Rui Wang, Kubilay Atasu
分類: cs.LG
原文アブストラクト
Financial transaction networks are naturally represented as multigraphs, where repeated transactions between the same pair of accounts are modeled as distinct edges. Recently proposed multigraph neural network architectures leverage this structure explicitly to achieve a strong performance on anti-money laundering (AML) tasks. However, their robustness to adversaries that manipulate transaction structures to evade detection remains largely unexplored. We present the first scalable framework for structural attacks and adversarial training of multigraph neural networks using node-edge incidence matrices, adapting projected gradient descent and projected randomized block coordinate descent methods to optimize structural perturbations over such matrices. We further introduce a cycle-based regularizer that penalizes changes in the global counts of directed 2- and 3-cycles, providing a structural measure of attack plausibility. Experiments on synthetic pattern-detection and realistic AML datasets show that our learned attacks substantially outperform non-learnable perturbation baselines in reducing detection performance (PR-AUC), while adversarial training consistently improves robustness against these attacks. These results demonstrate that multigraph neural networks are vulnerable to learned structural attacks and that adversarial training provides an effective defense. Our code is available at https://github.com/denheijmans/robust_multignn.