Next Article in Journal
Modeling, Fabrication and Testing of a Customizable Micromachined Hotplate for Sensor Applications
Next Article in Special Issue
Evaluation of Commercial Self-Monitoring Devices for Clinical Purposes: Results from the Future Patient Trial, Phase I
Previous Article in Journal
A Novel Secure IoT-Based Smart Home Automation System Using a Wireless Sensor Network
Previous Article in Special Issue
Concept and Development of an Electronic Framework Intended for Electrode and Surrounding Environment Characterization In Vivo
Open AccessArticle

A Comparison Study of Classifier Algorithms for Cross-Person Physical Activity Recognition

Department of Computer Science, Universidad Carlos III de Madrid, 28911 Leganés, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Octavian Adrian Postolache, Alex Casson and Subhas Chandra Mukhopadhyay
Sensors 2017, 17(1), 66; https://doi.org/10.3390/s17010066
Received: 1 November 2016 / Revised: 20 December 2016 / Accepted: 27 December 2016 / Published: 30 December 2016
(This article belongs to the Special Issue Sensing Technology for Healthcare System)
Physical activity is widely known to be one of the key elements of a healthy life. The many benefits of physical activity described in the medical literature include weight loss and reductions in the risk factors for chronic diseases. With the recent advances in wearable devices, such as smartwatches or physical activity wristbands, motion tracking sensors are becoming pervasive, which has led to an impressive growth in the amount of physical activity data available and an increasing interest in recognizing which specific activity a user is performing. Moreover, big data and machine learning are now cross-fertilizing each other in an approach called “deep learning”, which consists of massive artificial neural networks able to detect complicated patterns from enormous amounts of input data to learn classification models. This work compares various state-of-the-art classification techniques for automatic cross-person activity recognition under different scenarios that vary widely in how much information is available for analysis. We have incorporated deep learning by using Google’s TensorFlow framework. The data used in this study were acquired from PAMAP2 (Physical Activity Monitoring in the Ageing Population), a publicly available dataset containing physical activity data. To perform cross-person prediction, we used the leave-one-subject-out (LOSO) cross-validation technique. When working with large training sets, the best classifiers obtain very high average accuracies (e.g., 96% using extra randomized trees). However, when the data volume is drastically reduced (where available data are only 0.001% of the continuous data), deep neural networks performed the best, achieving 60% in overall prediction accuracy. We found that even when working with only approximately 22.67% of the full dataset, we can statistically obtain the same results as when working with the full dataset. This finding enables the design of more energy-efficient devices and facilitates cold starts and big data processing of physical activity records. View Full-Text
Keywords: physical activity recognition; classification; machine learning; deep learning; biomedical signal processing; time series analysis physical activity recognition; classification; machine learning; deep learning; biomedical signal processing; time series analysis
Show Figures

Figure 1

MDPI and ACS Style

Saez, Y.; Baldominos, A.; Isasi, P. A Comparison Study of Classifier Algorithms for Cross-Person Physical Activity Recognition. Sensors 2017, 17, 66.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop