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The receptive field (RF), which determines the region of time series to be “seen” and used, is critical to improve the performance for time series classification (TSC). However, the variation of signal scales across and within time series data, makes it challenging to decide on proper RF sizes for TSC. In this paper, we propose a dynamic sparse network (DSN) with sparse connections for TSC, which can learn to cover various RF without cumbersome hyper-parameters tuning. The kernels in each sparse layer are sparse and can be explored under the constraint regions by dynamic sparse training, which makes it possible to reduce the resource cost. The experimental results show that the proposed DSN model can achieve state-of-art performance on both univariate and multivariate TSC datasets with less than 50% computational cost compared with recent baseline methods, opening the path towards more accurate resource-aware methods for time series analyses. Our code is publicly available at: https://github.com/QiaoXiao7282/DSN.
Author Information
Qiao Xiao (Eindhoven University of Technology)
Boqian Wu (University of Twente)
Yu Zhang (HKUST)
Shiwei Liu (UT Austin)
I am a third-year Ph.D. student in the Data Mining Group, Department of Mathematics and Computer Science, Eindhoven University of Technology (TU/e). My current research topics are dynamic sparse training, sparse neural networks, pruning, the generalization of neural networks, etc. I am looking for a postdoc position in machine learning.
Mykola Pechenizkiy (TU Eindhoven)
Elena Mocanu (University of Twente)
Decebal Constantin Mocanu (University of Twente)
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