Human Activity Recognition from Wearable Sensor Data Using Self-Attention

• URL: http://arxiv.org/abs/2003.09018v1
• Date: Tue, 17 Mar 2020 14:16:57 GMT
• Title: Human Activity Recognition from Wearable Sensor Data Using Self-Attention
• Authors: Saif Mahmud, M Tanjid Hasan Tonmoy, Kishor Kumar Bhaumik, A K M Mahbubur Rahman, M Ashraful Amin, Mohammad Shoyaib, Muhammad Asif Hossain Khan, Amin Ahsan Ali
• Abstract summary: We present a self-attention based neural network model for activity recognition from body-worn sensor data. We performed experiments on four popular publicly available HAR datasets: PAMAP2, Opportunity, Skoda and USC-HAD. Our model achieve significant performance improvement over recent state-of-the-art models in both benchmark test subjects and Leave-one-out-subject evaluation.
• Score: 2.9023633922848586
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Human Activity Recognition from body-worn sensor data poses an inherent challenge in capturing spatial and temporal dependencies of time-series signals. In this regard, the existing recurrent or convolutional or their hybrid models for activity recognition struggle to capture spatio-temporal context from the feature space of sensor reading sequence. To address this complex problem, we propose a self-attention based neural network model that foregoes recurrent architectures and utilizes different types of attention mechanisms to generate higher dimensional feature representation used for classification. We performed extensive experiments on four popular publicly available HAR datasets: PAMAP2, Opportunity, Skoda and USC-HAD. Our model achieve significant performance improvement over recent state-of-the-art models in both benchmark test subjects and Leave-one-subject-out evaluation. We also observe that the sensor attention maps produced by our model is able capture the importance of the modality and placement of the sensors in predicting the different activity classes.

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