arXiv:2504.14250cs.LG2025-04中稿 · ICLR

提出APF框架,让图异常检测更懂异常。

Towards Anomaly-Aware Pre-Training and Fine-Tuning for Graph Anomaly Detection

  • 用瑞利商选异常子图,无标签训练增强异常感知
  • 双路表示学习捕捉通用语义与细微异常特征
  • 自适应融合+异常正则化,适合标注稀缺场景

图异常检测(GAD)近年来受到广泛关注,但面临两大挑战:(1) 标注成本高导致标签稀缺;(2) 节点与类别层面存在同质性差异。本文提出异常感知预训练与微调框架(APF),以缓解上述问题。预训练阶段,APF利用瑞利商(一种无标签异常度量)选择节点特异性子图,并融入学习目标以增强异常感知;同时引入两个可学习的谱多项式滤波器,联合学习捕捉通用语义与细微异常线索的双重表征。微调阶段,通过门控融合机制自适应整合跨节点与维度的预训练表示,并采用异常感知正则化损失,促使异常节点保留更多异常相关特征。理论分析表明,在温和条件下APF趋于线性可分。在10个基准数据集上的大量实验验证了其优于现有最先进方法的性能。

原文摘要 · Abstract (English)

Graph anomaly detection (GAD) has garnered increasing attention in recent years, yet remains challenging due to two key factors: (1) label scarcity stemming from the high cost of annotations and (2) homophily disparity at node and class levels. In this paper, we introduce Anomaly-Aware Pre-Training and Fine-Tuning (APF), a targeted and effective framework to mitigate the above challenges in GAD. In the pre-training stage, APF incorporates node-specific subgraphs selected via the Rayleigh Quotient, a label-free anomaly metric, into the learning objective to enhance anomaly awareness. It further introduces two learnable spectral polynomial filters to jointly learn dual representations that capture both general semantics and subtle anomaly cues. During fine-tuning, a gated fusion mechanism adaptively integrates pre-trained representations across nodes and dimensions, while an anomaly-aware regularization loss encourages abnormal nodes to preserve more anomaly-relevant information. Furthermore, we theoretically show that APF tends to achieve linear separability under mild conditions. Comprehensive experiments on 10 benchmark datasets validate the superior performance of APF in comparison to state-of-the-art baselines.

图神经网络异常检测预训练

Thank you to arXiv for use of its open access interoperability. PaperDance 不是 arXiv 官方产品;中文卡片由大模型生成,请以原文为准。