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Semi-Supervised Contrastive Learning for Time Series Classification in Healthcare

IEEE TRANSACTIONS ON EMERGING TOPICS IN COMPUTATIONAL INTELLIGENCE(2024)

Key Laboratory of Maritime Intelligent Cyberspace Technology | Engineering Research Center of Intelligent Theranostics Technology and Instruments | Univ N Carolina

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Abstract
Healthcare data comprises a diverse array of information, such as physiological indicators, activity behavior, sleep quality, and emotional state, among others. These features provide valuable insights into individuals' health status, behavioral patterns, and quality of life. Nevertheless, the lack of readily identifiable labeling information in this data poses a significant challenge for learning, particularly with label-limited time series data. Traditional annotation methods are prohibitively costly and time-consuming, making them impractical for large-scale applications. To tackle this challenge, this paper presents a novel approach called semi-supervised contrastive learning for time Series classification in healthcare (SSC-TC). This approach leverages existing positive-negative pairs and introduces new selection rules and loss functions to enhance the learning process. By generating pseudo-labels on the initially label-restricted dataset, the proposed model extracts more meaningful label information and learns richer representations. Experimental results demonstrate the superiority of the SSC-TC over other baseline methods, both on balanced and imbalanced datasets. The effectiveness of the approach is further validated through ablation experiments, where different components of the model are evaluated and their contributions to the overall performance are assessed. Overall, this research highlights the potential of semi-supervised contrastive learning in overcoming the limitations of label-restricted time series data in the field of healthcare. It offers a promising solution for leveraging the vast amount of wearable device data and extracting valuable insights for personalized caregiving without the need for extensive manual annotation.
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Key words
Time series analysis,Data models,Feature extraction,Medical services,Training,Biomedical monitoring,Task analysis,Contrastive learning,EEG,healthcare,medical time series,semi-supervised
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要点】:本文提出了一种半监督对比学习方法,用于解决医疗领域中标记受限的时间序列数据分类问题,通过生成伪标签和改进的选择规则及损失函数,有效提升了模型的表现。

方法】:通过利用已存在的正负样本对,引入新的样本选择规则和损失函数,模型能够在有限的标签数据上生成伪标签,进而学习到更为丰富的特征表示。

实验】:使用多个数据集进行实验,包括UCR数据集中的部分数据集,结果表明,所提出的SSC-TC方法在平衡和不平衡的数据集上均优于其他基准方法,并通过消融实验验证了模型不同组件对性能的贡献。