scoring rules, five stages are defined: awake, REM, and three types of non-REM sleep.4 The non-REM stages include stage N1 (light or transitional sleep), st...

https://www.apple.com/jp/healthcare/docs/site/Estimating_Sleep_Stages_from_Apple_Watch_Sept_2023.pdf

the audiogram curve using Gaussian process classification and selecting the subsequent stimuli using Bayesian active learning.  A rule-based sampling proces...

https://www.apple.com/jp/health/pdf/Hearing_Health_Features_on_AirPods_Pro_2_October_2024.pdf