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arXiv 2109.14752stat.MLcs.LG
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时间序列、随机场和其他结构化数据的核距离测度

Kernel distance measures for time series, random fields and other structured data

West Virginia University(西弗吉尼亚大学);Claremont Graduate University(克莱蒙特研究生大学);University of California—San Diego(加利福尼亚大学圣地亚哥分校)

Srinjoy Das, Hrushikesh Mhaskar, Alexander Cloninger

摘要:

本文介绍了kdiff,一种新的基于核的措施,估计时间序列,随机场和其他形式的结构化数据的实例之间的距离。该度量基于匹配仅在其支持区域的一部分上重叠的分布的想法。我们所提出的措施的灵感来自MPDist,这是以前提出的这样的数据集,并使用欧几里德度量构造,而kdiff是使用非线性核距离构造的。此外,kdiff考虑了实例之间的自身和交叉相似性,并使用距离分布的较低分位数定义。将交叉相似性与自相似性进行比较允许对相关信号的噪声和部分遮挡更鲁棒的相似性度量。我们提出的测量kdiff是一个更一般的形式,众所周知的基于内核的最大平均离散(MMD)距离估计的嵌入。提供了一些理论结果的可分性条件,使用kdiff作为聚类和分类问题的距离度量,嵌入分布可以建模为两个组件的混合物。应用程序的合成和现实生活中的时间序列和图像数据的聚类,和kdiff的性能相比,竞争的距离聚类措施。

英文摘要:

This paper introduces kdiff, a novel kernel-based measure for estimating distances between instances of time series, random fields and other forms of structured data. This measure is based on the idea of matching distributions that only overlap over a portion of their region of support. Our proposed measure is inspired by MPdist which has been previously proposed for such datasets and is constructed using Euclidean metrics, whereas kdiff is constructed using non-linear kernel distances. Also, kdiff accounts for both self and cross similarities across the instances and is defined using a lower quantile of the distance distribution. Comparing the cross similarity to self similarity allows for measures of similarity that are more robust to noise and partial occlusions of the relevant signals. Our proposed measure kdiff is a more general form of the well known kernel-based Maximum Mean Discrepancy (MMD) distance estimated over the embeddings. Some theoretical results are provided for separability conditions using kdiff as a distance measure for clustering and classification problems where the embedding distributions can be modeled as two component mixtures. Applications are demonstrated for clustering of synthetic and real-life time series and image data, and the performance of kdiff is compared to competing distance measures for clustering.

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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