期刊
SENSORS
卷 17, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/s17061370
关键词
long-term EMG pattern recognition; adaptive learning; concept drift; particle adaption; support vector classifier
资金
- National Natural Science Foundation of China [51675123]
- Foundation for Innovative Research Groups of National Natural Science Foundation of China [51521003]
- Self-Planned Task of State Key Laboratory of Robotics and System [SKLRS201603B]
- Research Fund for the Doctoral Program of Higher Education of China [20132302110034]
- Strategic Information and Communications R&D Promotion Programme [142103017]
Performance degradation will be caused by a variety of interfering factors for pattern recognition-based myoelectric control methods in the long term. This paper proposes an adaptive learning method with low computational cost to mitigate the effect in unsupervised adaptive learning scenarios. We presents a particle adaptive classifier (PAC), by constructing a particle adaptive learning strategy and universal incremental least square support vector classifier (LS-SVC). We compared PAC performance with incremental support vector classifier (ISVC) and non-adapting SVC (NSVC) in a long-term pattern recognition task in both unsupervised and supervised adaptive learning scenarios. Retraining time cost and recognition accuracy were compared by validating the classification performance on both simulated and realistic long-term EMG data. The classification results of realistic long-term EMG data showed that the PAC significantly decreased the performance degradation in unsupervised adaptive learning scenarios compared with NSVC (9.03% +/- 2.23%, p < 0.05) and ISVC (13.38% +/- 2.62%, p = 0.001), and reduced the retraining time cost compared with ISVC (2 ms per updating cycle vs. 50 ms per updating cycle).
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