论文标题

使用带有时间存在表示的自动编码器的时间序列数据中的更改点检测

Change Point Detection in Time Series Data using Autoencoders with a Time-Invariant Representation

论文作者

De Ryck, Tim, De Vos, Maarten, Bertrand, Alexander

论文摘要

变更点检测(CPD)旨在找到时间序列数据中的突然属性变化。最近的CPD方法证明了使用深度学习技术的潜力,但常常缺乏识别信号自相关统计数据的更细微变化并患有高误报率的能力。为了解决这些问题,我们采用了一种基于自动编码器的方法,具有新的损失功能,使用的自动编码器通过该方法学习了针对CPD量身定制的部分时间不变的表示。结果是一种灵活的方法,该方法允许用户指示在时域,频域还是两者兼而有之应寻求更改点。可检测的变化点包括斜率,均值,方差,自相关函数和频率频谱的突然变化。我们证明,我们所提出的方法在各种模拟和真实的基准数据集上始终具有高度竞争力或优于基线方法。最后,我们通过使用匹配过滤器和新提出的变更点得分的后处理过程来减轻错误检测警报的问题。我们表明,这种组合大大提高了我们方法的性能以及所有基线方法。

Change point detection (CPD) aims to locate abrupt property changes in time series data. Recent CPD methods demonstrated the potential of using deep learning techniques, but often lack the ability to identify more subtle changes in the autocorrelation statistics of the signal and suffer from a high false alarm rate. To address these issues, we employ an autoencoder-based methodology with a novel loss function, through which the used autoencoders learn a partially time-invariant representation that is tailored for CPD. The result is a flexible method that allows the user to indicate whether change points should be sought in the time domain, frequency domain or both. Detectable change points include abrupt changes in the slope, mean, variance, autocorrelation function and frequency spectrum. We demonstrate that our proposed method is consistently highly competitive or superior to baseline methods on diverse simulated and real-life benchmark data sets. Finally, we mitigate the issue of false detection alarms through the use of a postprocessing procedure that combines a matched filter and a newly proposed change point score. We show that this combination drastically improves the performance of our method as well as all baseline methods.

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