Time-series classification with COTE: The collective of transformation-based ensembles
| Autor: | Jason Lines, Anthony J. Bagnall, Jon Hills, Aaron Bostrom |
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| Rok vydání: | 2016 |
| Předmět: |
Scheme (programming language)
Time series classification Dynamic time warping Computer science 02 engineering and technology Machine learning computer.software_genre Distance measures Set (abstract data type) Ensembles of classifiers 020204 information systems 0202 electrical engineering electronic engineering information engineering Time series computer.programming_language business.industry Pattern recognition Computer Science Applications Euclidean distance Range (mathematics) ComputingMethodologies_PATTERNRECOGNITION Transformation (function) Computational Theory and Mathematics 020201 artificial intelligence & image processing Data mining Artificial intelligence business computer Information Systems |
| Zdroj: | ICDE |
| Popis: | Recently, two ideas have been explored that lead to more accurate algorithms for time-series classification (TSC). First, it has been shown that the simplest way to gain improvement on TSC problems is to transform into an alternative data space where discriminatory features are more easily detected. Second, it was demonstrated that with a single data representation, improved accuracy can be achieved through simple ensemble schemes. We combine these two principles to test the hypothesis that forming a collective of ensembles of classifiers on different data transformations improves the accuracy of time-series classification. The collective contains classifiers constructed in the time, frequency, change, and shapelet transformation domains. For the time domain, we use a set of elastic distance measures. For the other domains, we use a range of standard classifiers. Through extensive experimentation on 72 datasets, including all of the 46 UCR datasets, we demonstrate that the simple collective formed by including all classifiers in one ensemble is significantly more accurate than any of its components and any other previously published TSC algorithm. We investigate alternative hierarchical collective structures and demonstrate the utility of the approach on a new problem involving classifying Caenorhabditis elegans mutant types. |
| Databáze: | OpenAIRE |
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