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Distributed and parallel time series feature extraction for big data (arxiv.org)
3 points by jonbaer on Oct 31, 2016 | hide | past | pdf | discuss on HN

In plain words: It converts each time series into candidate features, then screens them with quick statistical tests to keep only ones tied to the target while limiting useless picks. Unlike slow model-retraining checks, it runs in parallel and handled every two-class archive problem plus factory data.

Abstract · Distributed and parallel time series feature extraction for industrial big data applications

The all-relevant problem of feature selection is the identification of all strongly and weakly relevant attributes. This problem is especially hard to solve for time series classification and regression in industrial applications such as predictive maintenance or production line optimization, for which each label or regression target is associated with several time series and meta-information simultaneously. Here, we are proposing an efficient, scalable feature extraction algorithm for time series, which filters the available features in an early stage of the machine learning pipeline with respect to their significance for the classification or regression task, while controlling the expected percentage of selected but irrelevant features. The proposed algorithm combines established feature extraction methods with a feature importance filter. It has a low computational complexity, allows to start on a problem with only limited domain knowledge available, can be trivially parallelized, is highly scalable and based on well studied non-parametric hypothesis tests. We benchmark our proposed algorithm on all binary classification problems of the UCR time series classification archive as well as time series from a production line optimization project and simulated stochastic processes with underlying qualitative change of dynamics.

Maximilian Christ, Andreas W. Kempa-Liehr, Michael Feindt
arXiv:1610.07717 · cs.LG · submitted Oct 25, 2016 · updated May 19, 2017
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