GPS HAR Shapley additive explanations VR high-altitude experiment Wi-Fi sensing accelerometer adversarial learning ankle–foot orthoses behavior reconstruction bic Book Industry Communication::M Medicine::MB Medicine: general issues::MBG Medical equipment & techniques camera calibration customer behavior recognition deep complex network deep learning digital image correlation domain generalization electrocardiogram energy consumption explainable methods functional electrical stimulation gated recurrent unit heart rate variability human activity recognition human in the loop in-store camera indoor localization leave-one-subject-out cross-validation machine learning multi-location n/a