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Bridging Generalization and Personalization in Human Activity Recognition via On-Device Few-Shot Learning

Created by
  • Haebom

Author

Pixi Kang, Julian Moosmann, Mengxi Liu, Bo Zhou, Michele Magno, Paul Lukowicz, Sizhen Bian

Outline

This paper proposes a novel on-device, few-shot learning framework that simultaneously achieves cross-user generalization and individual customization in human activity recognition (HAR) using various sensing modalities. To address the generalization failure of existing HAR models to user-specific variations, we first learn representations that generalize across users, and then directly update a lightweight classifier layer on resource-constrained devices that rapidly adapts to new users with only a small number of labeled samples. We implement and evaluate our framework on a RISC-V GAP9 microcontroller using three benchmark datasets: RecGym, QVAR-Gesture, and Ultrasound-Gesture. Post-deployment adaptation results in accuracy improvements of 3.73%, 17.38%, and 3.70%, respectively. This enables scalable, user-aware, and energy-efficient wearable HAR. The framework has been released as open source.

Takeaways, Limitations

Takeaways:
We present an on-device, few-shot learning framework that simultaneously achieves cross-user generalization and personalization.
Efficient learning and deployment in resource-constrained environments.
Improving scalability, user awareness, and energy efficiency of wearable HAR.
Supporting additional research through open source release.
Limitations:
The performance of the proposed framework may depend on the dataset used.
Further validation of generalization performance across various sensing modalities and activity types is needed.
Long-term stability and durability evaluation in real environments is required.
Scalability to other hardware platforms beyond the specific microcontroller used (RISC-V GAP9) needs to be verified.
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