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arXiv 2404.15331eess.SPcs.HC
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可穿戴人类活动识别的自监督学习技术比较

Comparing Self-Supervised Learning Techniques for Wearable Human Activity Recognition

Sannara Ek, Riccardo Presotto, Gabriele Civitarese, François Portet, Philippe Lalanda, Claudio Bettini

AI总结:

本文探索在有限标注数据下用于人类活动识别的自监督学习方法,比较了对比、生成和预测三种SSL技术及CNN与transformer架构,发现MAE方法显著优于SimCLR等先进方法。

摘要:

基于移动/可穿戴设备传感器的人类活动识别(HAR)旨在检测人类在日常生活中执行的体力活动。尽管监督学习方法在此任务中最有效,但其有效性受限于在训练期间使用大量标注数据。虽然收集原始未标注数据相对容易,但由于成本、侵入性和时间限制,标注数据具有挑战性。为应对这些挑战,本文探索了使用有限标注数据实现准确HAR的替代方法。具体而言,我们将最近的自监督学习(SSL)算法适配到HAR领域,并比较了它们的有效性。我们研究了不同家族的三种最先进的SSL技术:对比式、生成式和预测式。此外,我们通过比较最先进的CNN和transformer架构来评估底层神经网络对识别率的影响。我们的结果表明,Masked Auto Encoder(MAE)方法显著优于其他SSL方法,包括通常被认为是HAR领域性能最佳的SSL方法之一的SimCLR。代码和预训练的SSL模型已公开,供进一步研究和开发使用。

英文摘要:

Human Activity Recognition (HAR) based on the sensors of mobile/wearable devices aims to detect the physical activities performed by humans in their daily lives. Although supervised learning methods are the most effective in this task, their effectiveness is constrained to using a large amount of labeled data during training. While collecting raw unlabeled data can be relatively easy, annotating data is challenging due to costs, intrusiveness, and time constraints. To address these challenges, this paper explores alternative approaches for accurate HAR using a limited amount of labeled data. In particular, we have adapted recent Self-Supervised Learning (SSL) algorithms to the HAR domain and compared their effectiveness. We investigate three state-of-the-art SSL techniques of different families: contrastive, generative, and predictive. Additionally, we evaluate the impact of the underlying neural network on the recognition rate by comparing state-of-the-art CNN and transformer architectures. Our results show that a Masked Auto Encoder (MAE) approach significantly outperforms other SSL approaches, including SimCLR, commonly considered one of the best-performing SSL methods in the HAR domain. The code and the pre-trained SSL models are publicly available for further research and development.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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