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Few-Shot Learning for Cross-Domain Human Activity Recognition Using Wearable Sensors.

Hao Zheng, Hongji Xu, Fei Gao

    IEEE Journal of Biomedical and Health Informatics
    |July 15, 2026
    PubMed
    Summary

    A new network, CFSH-Net, enables accurate human activity recognition (HAR) with limited data by adapting to new sensors and users. This lightweight model overcomes challenges in health monitoring and smart homes.

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    Area of Science:

    • Pervasive computing and artificial intelligence.
    • Biomedical engineering and health informatics.

    Background:

    • Sensor-based human activity recognition (HAR) is vital for health monitoring and smart environments.
    • Deep learning for HAR faces limitations due to scarce labeled data and domain shifts (user, sensor, scenario variability).

    Purpose of the Study:

    • To propose a novel lightweight cross-domain few-shot (FS) sensor-based HAR network (CFSH-Net).
    • To enable robust HAR with limited labeled samples and adapt to unseen activities and domain shifts without fine-tuning.

    Main Methods:

    • Utilized wavelet-driven depth-wise bilateral decomposition (WDBD) as a feature extractor.
    • Developed a network architecture for cross-domain few-shot learning in sensor-based HAR.
    • Evaluated on six public benchmarks: OPPORTUNITY, PAMAP2, UCI-HAR, WISDM, WISDM2019, and USC-HAD.

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    Main Results:

    • Achieved 85.22% accuracy for unseen activities on PAMAP2 and 88.66% on OPPORTUNITY (5-way 5-shot).
    • Reached 79.94% average accuracy in cross-position recognition.
    • Demonstrated strong cross-user generalization and stable cross-dataset transfer.

    Conclusions:

    • CFSH-Net provides an effective and practical solution for robust sensor-based HAR.
    • The proposed method addresses severe label scarcity and domain shift challenges in real-world applications.