ConvAE-LSTM: convolutional autoencoder long short-term memory network for smartphone-based human activity recognition

Thakur, D., Biswas, S., Ho, E. S. L. and Chattopadhyay, S. (2022) ConvAE-LSTM: convolutional autoencoder long short-term memory network for smartphone-based human activity recognition. IEEE Access, 10, pp. 4137-4156. (doi: 10.1109/ACCESS.2022.3140373)

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The self-regulated recognition of human activities from time-series smartphone sensor data is a growing research area in smart and intelligent health care. Deep learning (DL) approaches have exhibited improvements over traditional machine learning (ML) models in various domains, including human activity recognition (HAR). Several issues are involved with traditional ML approaches; these include handcrafted feature extraction, which is a tedious and complex task involving expert domain knowledge, and the use of a separate dimensionality reduction module to overcome overfitting problems and hence provide model generalization. In this article, we propose a DL-based approach for activity recognition with smartphone sensor data, i.e., accelerometer and gyroscope data. Convolutional neural networks (CNNs), autoencoders (AEs), and long short-term memory (LSTM) possess complementary modeling capabilities, as CNNs are good at automatic feature extraction, AEs are used for dimensionality reduction and LSTMs are adept at temporal modeling. In this study, we take advantage of the complementarity of CNNs, AEs, and LSTMs by combining them into a unified architecture. We explore the proposed architecture, namely, “ConvAE-LSTM”, on four different standard public datasets (WISDM, UCI, PAMAP2, and OPPORTUNITY). The experimental results indicate that our novel approach is practical and provides relative smartphone-based HAR solution performance improvements in terms of computational time, accuracy, F1-score, precision, and recall over existing state-of-the-art methods.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Ho, Dr Edmond S. L
Authors: Thakur, D., Biswas, S., Ho, E. S. L., and Chattopadhyay, S.
College/School:College of Science and Engineering > School of Computing Science
Journal Name:IEEE Access
ISSN (Online):2169-3536
Published Online:04 January 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in IEEE Access 10: 4137-4156
Publisher Policy:Reproduced under a Creative Commons License

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