Multivariate time series classification based on M-histograms and multi-view learning

Angéline Plaud , Engelbert Mephu Nguifo (1) , Jacques Charreyron

1 LIMOS - Laboratoire d'Informatique, de Modélisation et d'optimisation des Systèmes

Univariate time series (UTS) classification has been reported in several papers, where various efficient models have been proposed. Such models are often inadequate for multivariate time series (MTS) classification. MTS emerged with the multiplication of sensors that record large amounts of high-dimensional data, characterized by several dimensions , variable lengths, noise and correlations between dimensions. MTS classification is a challenging task, and few works have been devoted to complex data. In this paper, we propose a novel subspace model that combines M-histograms and multi-view learning together with an ensemble learning technique to handle MTS classification task. The M-histograms is a statistical tool, efficient for data visualization, that can reveal mutual information from different dimensions. Thus it can be suitable for MTS data encoding. Multi-view learning is known as data integration from multiple feature sets, as it is the case with MTS data, and multiple views also provide complementary information. The new combined model provides a MTS encoding that can outperform other time series encoding such as Symbolic Aggregate approXimation (SAX) w.r.t. to the experimental comparison that was conducted. We also benchmark our method with some state-of-art methods devoted to MTS, and discuss the results obtained and the main properties of our model.

Domaines: Informatique [cs]; Intelligence artificielle [cs.AI]

Angéline Plaud, Engelbert Mephu Nguifo, Jacques Charreyron. Multivariate time series classification based on M-histograms and multi-view learning. 2019. ⟨hal-02162067⟩