A Novel Human Activity Recognition Scheme for Smart Health Using Multilayer Extreme Learning Machine

In recent years, more and more wearable sensors have been employed in smart health applications. Wearable sensors not only can be used to collect valuable health-related data of their users, they can be also used in conjunction with other infrastructure-bound sensors, such as Microsoft Kinect sensor, to facilitate privacy-aware fine-grained activity tracking. This fusion of multimodal data promises a new type of smart health applications that coach a user to live a healthier life style by monitoring the user in realtime and reminding him or her when he or she engages in an unhealthy activity. In this paper, we investigate how to achieve fine-grained activity recognition in the context of such an application. In our scheme, the identification accuracy is improved by incorporating a nonlinear and local similarity measure, namely kernel risk-sensitive loss, into a novel multilayer neural network learning algorithm, called as stacked extreme learning machine. Furthermore, to achieve a good generalization performance with minimal human intervention, Jaya as a popular optimization algorithm, is also used to adjust key parameters in our proposed approach. The experiments are conducted to verify the effectiveness of the proposed scheme.