Abstract
Dynamic Time Warping (DTW) is considered as a robust measure to compare numerical time series when some time elasticity is required. However, speed is a known major drawback of DTW due to its quadratic complexity. Previous work has mainly considered designing speed optimization based on early-abandoning strategies applied to nearest-neighbor classification, although some of these optimizations are restricted to uni-dimensional time series. In this paper, we introduce Coarse-DTW, a reinterpretation of DTW for sparse time series, which exploits adaptive downsampling to achieve speed enhancement, even when faced with multidimensional time series. We show that Coarse-DTW achieves nontrivial speedups in nearest-neighbor classification and even admits a positive-definite kernelization suitable for SVM classification, hence offering a good tradeoff between speed and accuracy.
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This study was co-funded by the ANRT agency and Thales Optronique SAS, under the PhD CIFRE convention 2013/0932.
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Dupont, M., Marteau, PF. (2016). Coarse-DTW for Sparse Time Series Alignment. In: Douzal-Chouakria, A., Vilar, J., Marteau, PF. (eds) Advanced Analysis and Learning on Temporal Data. AALTD 2015. Lecture Notes in Computer Science(), vol 9785. Springer, Cham. https://doi.org/10.1007/978-3-319-44412-3_11
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