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arXiv 2302.12918cs.LG
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深度图流SVDD:网络物理系统中的异常检测

Deep Graph Stream SVDD: Anomaly Detection in Cyber-Physical Systems

University of Central Florida(中佛罗里达大学)

Ehtesamul Azim, Dongjie Wang, Yanjie Fu

摘要:

我们的工作重点是网络物理系统中的异常检测。现有文献有三个局限性:(1)未能捕获系统异常中的长延迟模式;(2)忽略传感器连接的动态变化;(3)高维数据样本的诅咒。这些限制了现有作品的检测性能和实用性。为了解决这些问题,我们提出了一种新的方法,称为深度图流支持向量数据描述(SVDD)的异常检测。具体来说,我们首先使用一个Transformer来保存时间嵌入中的监控数据的短期和长期模式。然后,我们根据传感器类型聚类这些嵌入,并利用它们来估计各种传感器之间的连接变化,以构建一个新的加权图。将时态嵌入作为节点属性映射到新的图中,形成加权属性图。我们将图输入到变分图自动编码器模型中以学习最终的时空表示。最后,我们学习一个包含正常嵌入的超球体,并通过计算超球体和数据样本之间的距离来预测系统状态。大量的实验验证了我们的模型的优越性,它将F1分数提高了35.87%,AUC提高了19.32%,同时在训练和推理方面比最佳基线快了32倍。

英文摘要:

Our work focuses on anomaly detection in cyber-physical systems. Prior literature has three limitations: (1) Failing to capture long-delayed patterns in system anomalies; (2) Ignoring dynamic changes in sensor connections; (3) The curse of high-dimensional data samples. These limit the detection performance and usefulness of existing works. To address them, we propose a new approach called deep graph stream support vector data description (SVDD) for anomaly detection. Specifically, we first use a transformer to preserve both short and long temporal patterns of monitoring data in temporal embeddings. Then we cluster these embeddings according to sensor type and utilize them to estimate the change in connectivity between various sensors to construct a new weighted graph. The temporal embeddings are mapped to the new graph as node attributes to form weighted attributed graph. We input the graph into a variational graph auto-encoder model to learn final spatio-temporal representation. Finally, we learn a hypersphere that encompasses normal embeddings and predict the system status by calculating the distances between the hypersphere and data samples. Extensive experiments validate the superiority of our model, which improves F1-score by 35.87%, AUC by 19.32%, while being 32 times faster than the best baseline at training and inference.

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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