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arXiv 1804.04876cs.CV
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使用深度生成模型的组异常检测

Group Anomaly Detection using Deep Generative Models

The University of Sydney(悉尼大学);Capital Markets CRC(资本市场合作研究中心);Qatar Computing Research Institute, HBKU(哈马德·本·哈利法大学卡塔尔计算研究所)

Raghavendra Chalapathy, Edward Toth, Sanjay Chawla

摘要:

与传统的异常检测研究,重点是点异常,我们的目标是检测异常的个人数据点的集合。特别是,我们执行组异常检测(GAD),重点是不规则的组分布(例如图像像素的不规则混合物)。GAD是检测现实世界应用中的异常和异常现象的重要任务,例如高能粒子物理,社交媒体和医学成像。在本文中,我们通过提出深度生成模型:对抗性自动编码器(AAE)和变分自编码器(VAE)来进行组异常检测。AAE和VAE都使用逐点输入数据来检测组异常,其中组成员是先验已知的。我们进行了广泛的实验,以评估我们的模型在现实世界的数据集。实验结果表明,我们的方法是有效的和强大的检测群体异常。

英文摘要:

Unlike conventional anomaly detection research that focuses on point anomalies, our goal is to detect anomalous collections of individual data points. In particular, we perform group anomaly detection (GAD) with an emphasis on irregular group distributions (e.g. irregular mixtures of image pixels). GAD is an important task in detecting unusual and anomalous phenomena in real-world applications such as high energy particle physics, social media, and medical imaging. In this paper, we take a generative approach by proposing deep generative models: Adversarial autoencoder (AAE) and variational autoencoder (VAE) for group anomaly detection. Both AAE and VAE detect group anomalies using point-wise input data where group memberships are known a priori. We conduct extensive experiments to evaluate our models on real-world datasets. The empirical results demonstrate that our approach is effective and robust in detecting group anomalies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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