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Graph anomaly detection (GAD) aims to identify abnormal nodes that differ from the majority of the nodes in a graph, which has been attracting significant attention in recent years. Existing generalist graph models have achieved remarkable…

Machine Learning · Computer Science 2025-06-03 Hezhe Qiao , Chaoxi Niu , Ling Chen , Guansong Pang

A significant number of anomalous nodes in the real world, such as fake news, noncompliant users, malicious transactions, and malicious posts, severely compromises the health of the graph data ecosystem and urgently requires effective…

Machine Learning · Computer Science 2026-03-11 Xiong Zhang , Hong Peng , Changlong Fu , Xin Jin , Yun Yang , Cheng Xie

Graph anomaly detection (GAD) is a critical task in graph machine learning, with the primary objective of identifying anomalous nodes that deviate significantly from the majority. This task is widely applied in various real-world scenarios,…

Machine Learning · Computer Science 2025-07-03 Xiang Li , Jianpeng Qi , Zhongying Zhao , Guanjie Zheng , Lei Cao , Junyu Dong , Yanwei Yu

Graph anomaly detection in this paper aims to distinguish abnormal nodes that behave differently from the benign ones accounting for the majority of graph-structured instances. Receiving increasing attention from both academia and industry,…

Machine Learning · Computer Science 2022-10-19 Fanzhen Liu , Xiaoxiao Ma , Jia Wu , Jian Yang , Shan Xue , Amin Beheshti , Chuan Zhou , Hao Peng , Quan Z. Sheng , Charu C. Aggarwal

Graph anomaly detection (GAD) has attracted increasing attention in recent years for identifying malicious samples in a wide range of graph-based applications, such as social media and e-commerce. However, most GAD methods assume identical…

Machine Learning · Computer Science 2025-09-09 Junjun Pan , Yu Zheng , Yue Tan , Yixin Liu

Graph Anomaly Detection (GAD) aims to identify nodes that deviate from the majority within a graph, playing a crucial role in applications such as social networks and e-commerce. Despite the current advancements in deep learning-based GAD,…

Machine Learning · Computer Science 2025-08-20 Yunfeng Zhao , Yixin Liu , Shiyuan Li , Qingfeng Chen , Yu Zheng , Shirui Pan

Graph anomaly detection (GAD) is a vital task in graph-based machine learning and has been widely applied in many real-world applications. The primary goal of GAD is to capture anomalous nodes from graph datasets, which evidently deviate…

Machine Learning · Computer Science 2022-12-05 Jingcan Duan , Siwei Wang , Pei Zhang , En Zhu , Jingtao Hu , Hu Jin , Yue Liu , Zhibin Dong

Graph anomaly detection (GAD) aims to identify anomalous graphs that significantly deviate from other ones, which has raised growing attention due to the broad existence and complexity of graph-structured data in many real-world scenarios.…

Machine Learning · Computer Science 2024-02-21 Jinyu Cai , Yunhe Zhang , Zhoumin Lu , Wenzhong Guo , See-kiong Ng

Graph Anomaly Detection (GAD) aims to identify atypical graph entities, such as nodes, edges, or substructures, that deviate significantly from the majority. While existing text-rich approaches typically integrate structural context into…

Computation and Language · Computer Science 2026-05-20 Wen Shi , Zhe Wang , Huafei Huang , Qing Qing , Ziqi Xu , Qixin Zhang , Xikun Zhang , Renqiang Luo , Feng Xia

While foundation models have revolutionized such fields as natural language processing and computer vision, their potential in graph machine learning remains largely unexplored. One of the key challenges in designing graph foundation models…

Machine Learning · Computer Science 2025-09-24 Dmitry Eremeev , Gleb Bazhenov , Oleg Platonov , Artem Babenko , Liudmila Prokhorenkova

Graph anomaly detection (GAD) has achieved success and has been widely applied in various domains, such as fraud detection, cybersecurity, finance security, and biochemistry. However, existing graph anomaly detection algorithms focus on…

Machine Learning · Computer Science 2023-08-03 Xing Ai , Jialong Zhou , Yulin Zhu , Gaolei Li , Tomasz P. Michalak , Xiapu Luo , Kai Zhou

Graph anomaly detection (GAD) aims to identify nodes that deviate from normal patterns in structure or features. While recent GNN-based approaches have advanced this task, they struggle with two major challenges: 1) homophily disparity,…

Machine Learning · Computer Science 2026-03-10 Yunhui Liu , Qizhuo Xie , Yinfeng Chen , Xudong Jin , Tao Zheng , Bin Chong , Tieke He

Graph anomaly detection (GAD) is a challenging binary classification problem due to its different structural distribution between anomalies and normal nodes -- abnormal nodes are a minority, therefore holding high heterophily and low…

Machine Learning · Computer Science 2024-01-26 Yuan Gao , Xiang Wang , Xiangnan He , Zhenguang Liu , Huamin Feng , Yongdong Zhang

Graph anomaly detection (GAD) is a vital task since even a few anomalies can pose huge threats to benign users. Recent semi-supervised GAD methods, which can effectively leverage the available labels as prior knowledge, have achieved…

Machine Learning · Computer Science 2023-06-21 Shuang Zhou , Xiao Huang , Ninghao Liu , Huachi Zhou , Fu-Lai Chung , Long-Kai Huang

Graph anomaly detection (GAD) is a vital task since even a few anomalies can pose huge threats to benign users. Recent semi-supervised GAD methods, which can effectively leverage the available labels as prior knowledge, have achieved…

Machine Learning · Computer Science 2023-07-25 Shuang Zhou , Xiao Huang , Ninghao Liu , Fu-Lai Chung , Long-Kai Huang

Group anomaly detection is crucial in many network applications, but faces challenges due to diverse anomaly patterns. Motivated by the success of large language models (LLMs) in natural language processing, graph foundation models (GFMs)…

Artificial Intelligence · Computer Science 2026-01-16 Jiujiu Chen , Weijun Zeng , Shaofeng Hu , Sihong Xie , Hui Xiong

Graph Anomaly Detection (GAD) is a critical task in graph machine learning with vital applications in financial fraud detection and social platform governance. However, existing GAD benchmarks are often restricted to small-scale, curated…

Machine Learning · Computer Science 2026-05-11 Jingjing Zhou , Shiyu Huang , Qing Qing , Zuquan Yuan , Huafei Huang , Ziqi Xu , Mingliang Hou , Xikun Zhang , Renqiang Luo , Ivan Lee

Graph foundation models (GFMs) have recently emerged as a promising paradigm for achieving broad generalization across various graph data. However, existing GFMs are often trained on datasets that may not fully reflect real-world graphs,…

Machine Learning · Computer Science 2025-10-10 Adrian Hayler , Xingyue Huang , İsmail İlkan Ceylan , Michael Bronstein , Ben Finkelshtein

Graph anomaly detection (GAD), which aims to identify unusual graph instances (nodes, edges, subgraphs, or graphs), has attracted increasing attention in recent years due to its significance in a wide range of applications. Deep learning…

Machine Learning · Computer Science 2025-06-19 Hezhe Qiao , Hanghang Tong , Bo An , Irwin King , Charu Aggarwal , Guansong Pang

Given a complex graph database of node- and edge-attributed multi-graphs as well as associated metadata for each graph, how can we spot the anomalous instances? Many real-world problems can be cast as graph inference tasks where the graph…

Machine Learning · Computer Science 2023-11-21 Konstantinos Sotiropoulos , Lingxiao Zhao , Pierre Jinghong Liang , Leman Akoglu
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