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arXiv 2008.09524cs.LGeess.SPstat.ML
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使用具有时不变表示的自编码器检测时间序列数据中的变点

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

KU Leuven(鲁汶大学);ETH Zürich(苏黎世联邦理工学院)

Tim De Ryck, Maarten De Vos, Alexander Bertrand

摘要:

变点检测(CPD)的目的是定位时间序列数据中的突然属性变化。最近的CPD方法展示了使用深度学习技术的潜力,但通常缺乏识别信号自相关统计中更细微变化的能力,并且具有较高的误报率。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与一种新的损失函数,通过使用的自动编码器学习的部分时不变的表示,是专为CPD。其结果是一个灵活的方法,允许用户指示是否应寻求在时域,频域或两者的变化点。可检测的变化点包括斜率、均值、方差、自相关函数和频谱的突变。我们证明,我们提出的方法是一贯的高度竞争力或优于基线方法在不同的模拟和现实生活中的基准数据集。最后,我们通过使用一个后处理过程,结合匹配滤波器和新提出的变化点得分,减轻了错误检测警报的问题。我们表明,这种组合大大提高了我们的方法以及所有基线方法的性能。

英文摘要:

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.

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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