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A Class Incremental Extreme Learning Machine for Activity Recognition

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Abstract

Automatic activity recognition is an important problem in cognitive systems. Mobile phone-based activity recognition is an attractive research topic because it is unobtrusive. There are many activity recognition models that can infer a user’s activity from sensor data. However, most of them lack class incremental learning abilities. That is, the trained models can only recognize activities that were included in the training phase, and new activities cannot be added in a follow-up phase. We propose a class incremental extreme learning machine (CIELM). It (1) builds an activity recognition model from labeled samples using an extreme learning machine algorithm without iterations; (2) adds new output nodes that correspond to new activities; and (3) only requires labeled samples of new activities and not previously used training data. We have tested the method using activity data. Our results demonstrated that the CIELM algorithm is stable and can achieve a similar recognition accuracy to the batch learning method.

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Notes

  1. UCI Machine Learning Repository, http://archive.ics.uci.edu/ml/.

  2. Source codes and some references for ELM can be found at www.ntu.edu.sg/home/egbhuang.

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Acknowledgments

This work was supported in part by the Natural Science Foundation of China (61070110, 90820303), Beijing Natural Science Foundation (4112056, 4144085), Open Project of Beijing Key Laboratory of Mobile Computing and Pervasive Device, National Science and Technology Major Project (2012ZX07205-005), and Scientific and Technological Project of He’nan Province (No. 132102310258).

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Correspondence to Zhongtang Zhao.

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Zhao, Z., Chen, Z., Chen, Y. et al. A Class Incremental Extreme Learning Machine for Activity Recognition. Cogn Comput 6, 423–431 (2014). https://doi.org/10.1007/s12559-014-9259-y

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