Efficient motif discoveryfor large scale time series in healthcare
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Efficient motif discoveryfor large scale time series in healthcare
- 1. EFFICIENT MOTIF DISCOVERYFOR LARGE-SCALE TIME SERIES IN HEALTHCARE ABSTRACT Analyzing time series data can reveal the temporal behavior of the underlying mechanism producing the data. Time series motifs, which are similar subsequences or frequently occurring patterns, have significant meanings for researchers especially in medical domain. With the fast growth of time series data, traditional methods for motif discovery are inefficient and not applicable to large-scale data. This work proposes an efficient Motif Discovery method for Large-scale time series (MDLats). By computing standard motifs, MDLats eliminates a majority of redundant computation in the related arts and re-uses existing information to the maximum. All the motif types and subsequences are generated for subsequent analysis and classification. Our system is implemented on a Hadoop platform and deployed in a hospital for clinical electrocardiography classification. The experiments on real-world healthcare data show that MDLats outperforms the state-of-the-art methods even in large time series.