GLULA: LINEAR ATTENTION BASED MODEL FOR EFFICIENT HUMAN ACTIVITY RECOGNITION FROM WEARABLE SENSORS AND SKELETON DATA

Abstract

Sensors’ data is used in monitoring patient activity during rehabilitation and also can be extended to controlling rehabilitation devices based on the activity of the person. Both wearable sensors and extracted skeleton data from the video can be used for that. As there, exist similarities, a unified solution can be presented, which also focuses on effectively capturing the spatiotemporal dependencies in the data collected by these sensors and efficiently classifying human activities. With the increasing complexity and size of models, there is a growing emphasis on optimizing their efficiency in terms of memory usage and inference time for real-time usage and mobile computers. There is an opportunity to develop a novel unified framework that incorporates recent advancements to enhance speed and memory efficiency, specifically tailored for Human Activity Recognition (HAR) tasks. In line with this approach, we present GLULA, a unique architecture for human activity recognition. GLULA combines gated convolutional networks, branched convolutions, and linear self-attention to achieve efficient and powerful solutions. Extensive experiments showed its effectiveness both in wearable sensors’ data and skeleton-based sets. Tests were conducted on five benchmark IMU datasets: PAMAP2, SKODA, OPPORTUNITY, DAPHNET, and USC-HAD. Our findings demonstrate that GLULA outperforms recent models in the literature on the latter four datasets but also exhibits the lowest parameter count among stateof- the-art models. In HAR for the human skeleton domain, examinations were done on the NTU RGB+D dataset. While getting comparable results with recent work in this field, it managed to be smaller and significantly faster.