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Collaborative activity recognition with heterogeneous activity sets and privacy preferences

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Date
04/11/2021
Author
Civitarese, Gabriele
Ye, Juan
Zampatti, Matteo
Bettini, Claudio
Keywords
Activity recognition
Collaborative learning
Semi-supervised learning,
Privacy
QA75 Electronic computers. Computer science
I-PW
AC
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Abstract
One of the major challenges in Human Activity Recognition (HAR) based on machine learning is the scarcity of labeled data. Indeed, collecting a sufficient amount of training data to build a reliable recognition problem is often prohibitive. Among the many solutions in the literature to mitigate this issue, collaborative learning is emerging as a promising direction to distribute the annotation burden over multiple users that cooperate to build a shared recognition model. One of the major issues of existing methods is that they assume a static activity model with a fixed set of target activities. In this paper, we propose a novel approach that is based on Growing When Required (GWR) neural networks. A GWR network continuously adapts itself according to the input training data, and hence it is particularly suited when the users share heterogeneous sets of activities. Like in federated learning, for the sake of privacy preservation, each user contributes to the global activity classifier by sharing personal model parameters, and not by directly sharing data. In order to further mitigate privacy threats, we implement a strategy to avoid releasing model parameters that may indirectly reveal information about activities that the user specifically marked as private. Our results on two well-known publicly available datasets show the effectiveness and the flexibility of our approach.
Citation
Civitarese , G , Ye , J , Zampatti , M & Bettini , C 2021 , ' Collaborative activity recognition with heterogeneous activity sets and privacy preferences ' , Journal of Ambient Intelligence and Smart Environments , vol. Pre-press , pp. 1-20 . https://doi.org/10.3233/ais-210018
Publication
Journal of Ambient Intelligence and Smart Environments
Status
Peer reviewed
DOI
https://doi.org/10.3233/ais-210018
ISSN
1876-1364
Type
Journal article
Rights
Copyright © 2021 IOS Press and the authors. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.3233/AIS-210018.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/24362

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