arXiv Machine Learning By Zhongli Wu, Zhuangzhi Gao, Yuankai Wang, Gregory Y. H. Lip, Bilal H. Kirmani, Yalin Zheng

Teaching PPG How not Who: Fixed-Effects Distillation from ECG

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The paper investigates how ECG data used to train photoplethysmography (PPG)-only models primarily teaches the model to recognize individual identity rather than cardiovascular state changes. By removing each recording’s mean (fixed‑effects distillation), the authors eliminate the identity signal, leading to a substantial increase in state agreement and improved within‑person performance across multiple models and datasets. The study demonstrates that conditioning on the recording itself directs distillation toward the dynamic changes that wearables are designed to capture.

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