to an algorithm that classifies the signal every 30 seconds (epochs) into one of four stages: Awake, REM sleep, Deep sleep, or Core sleep. This classificati...

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