论文标题
基准测试多元时间序列分类算法
Benchmarking Multivariate Time Series Classification Algorithms
论文作者
论文摘要
时间序列分类(TSC)涉及从有序,实际有价值的属性的离散目标变量构建预测模型。近年来,已经开发了一系列新的TSC算法,这些算法对先前的最新状态取得了重大改进。主要重点是单变量TSC,即每个情况都有一个系列和类标签的问题。实际上,遇到多元系列的多元TSC(MTSC)问题更常见,其中多个系列与单个标签相关联。尽管如此,与单变量案例相比,对MTSC的考虑要少得多。 2018年发布的30个MTSC问题的UEA档案使算法的比较变得更加容易。我们审查了最近根据深度学习,形状和单词方法的定制MTSC算法提出的定制MTSC算法。 MTSC的最简单方法是在多变量维度上整合单变量分类器。我们将定制算法与这些尺寸独立的方法进行比较,在30 MTSC档案问题中的26个中,数据全部相等。我们证明,Hive-cote分类器的独立合奏是最准确的,但是与单变量分类不同,动态时间扭曲在MTSC中仍然具有竞争力。
Time Series Classification (TSC) involved building predictive models for a discrete target variable from ordered, real valued, attributes. Over recent years, a new set of TSC algorithms have been developed which have made significant improvement over the previous state of the art. The main focus has been on univariate TSC, i.e. the problem where each case has a single series and a class label. In reality, it is more common to encounter multivariate TSC (MTSC) problems where multiple series are associated with a single label. Despite this, much less consideration has been given to MTSC than the univariate case. The UEA archive of 30 MTSC problems released in 2018 has made comparison of algorithms easier. We review recently proposed bespoke MTSC algorithms based on deep learning, shapelets and bag of words approaches. The simplest approach to MTSC is to ensemble univariate classifiers over the multivariate dimensions. We compare the bespoke algorithms to these dimension independent approaches on the 26 of the 30 MTSC archive problems where the data are all of equal length. We demonstrate that the independent ensemble of HIVE-COTE classifiers is the most accurate, but that, unlike with univariate classification, dynamic time warping is still competitive at MTSC.