Fast time series classification using numerosity reduction

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Fast time series classification using numerosity reduction

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ACM International Conference Proceeding Series; Vol. 148 archive
Proceedings of the 23rd international conference on Machine learning table of contents

Pittsburgh, Pennsylvania

Pages: 1033 - 1040

Year of Publication: 2006

ISBN:1-59593-383-2

Authors

Xiaopeng Xi	University of California, Riverside, CA
Eamonn Keogh	University of California, Riverside, CA
Christian Shelton	University of California, Riverside, CA
Li Wei	University of California, Riverside, CA
Chotirat Ann Ratanamahatana	Chulalongkorn University, Bangkok, Thailand

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ACM New York, NY, USA

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ABSTRACT

Many algorithms have been proposed for the problem of time series classification. However, it is clear that one-nearest-neighbor with Dynamic Time Warping (DTW) distance is exceptionally difficult to beat. This approach has one weakness, however; it is computationally too demanding for many realtime applications. One way to mitigate this problem is to speed up the DTW calculations. Nonetheless, there is a limit to how much this can help. In this work, we propose an additional technique, numerosity reduction, to speed up one-nearest-neighbor DTW. While the idea of numerosity reduction for nearest-neighbor classifiers has a long history, we show here that we can leverage off an original observation about the relationship between dataset size and DTW constraints to produce an extremely compact dataset with little or no loss in accuracy. We test our ideas with a comprehensive set of experiments, and show that it can efficiently produce extremely fast accurate classifiers.

REFERENCES

Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

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	Jae-Gil Lee , Jiawei Han , Xiaolei Li , Hector Gonzalez, TraClass: trajectory classification using hierarchical region-based and trajectory-based clustering, Proceedings of the VLDB Endowment, v.1 n.1, August 2008
	Khandoker Tarik-Ul Islam , Kamrul Hasan , Young-Koo Lee , Sungyoung Lee, Enhanced 1-NN time series classification using badness of records, Proceedings of the 2nd international conference on Ubiquitous information management and communication, January 31-February 01, 2008, Suwon, Korea
	Xiang Bai , Xingwei Yang , Longin Jan Latecki, Detection and recognition of contour parts based on shape similarity, Pattern Recognition, v.41 n.7, p.2189-2199, July, 2008
	Wanpracha Art Chaovalitwongse , Ya-Ju Fan , Rajesh C. Sachdeo, Support feature machine for classification of abnormal brain activity, Proceedings of the 13th ACM SIGKDD international conference on Knowledge discovery and data mining, August 12-15, 2007, San Jose, California, USA
	Hui Ding , Goce Trajcevski , Peter Scheuermann , Xiaoyue Wang , Eamonn Keogh, Querying and mining of time series data: experimental comparison of representations and distance measures, Proceedings of the VLDB Endowment, v.1 n.2, August 2008
	Ankur Jain , Daniel Nikovski, Incremental exemplar learning schemes for classification on embedded devices, Machine Learning, v.72 n.3, p.189-203, September 2008
	Jin Shieh , Eamonn Keogh, iSAX: indexing and mining terabyte sized time series, Proceeding of the 14th ACM SIGKDD international conference on Knowledge discovery and data mining, August 24-27, 2008, Las Vegas, Nevada, USA
	Vincent S. Tseng , Chao-Hui Lee, Effective temporal data classification by integrating sequential pattern mining and probabilistic induction, Expert Systems with Applications: An International Journal, v.36 n.5, p.9524-9532, July, 2009
	Omar U. Florez , SeungJin Lim, Discovery of time series in video data through distribution of spatiotemporal gradients, Proceedings of the 2009 ACM symposium on Applied Computing, March 08-12, 2009, Honolulu, Hawaii
	Dragomir Yankov , Eamonn Keogh , Umaa Rebbapragada, Disk aware discord discovery: finding unusual time series in terabyte sized datasets, Knowledge and Information Systems, v.17 n.2, p.241-262, November 2008
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