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Heart rate-deep neural network interpretability. Saliency map overlaid on a heart-rate plot of the first 15 h of a true-positive Holter (a Holter with atrial fibrillation predicted from the first 24 h and atrial fibrillation documented within 2 weeks after). The highlighted areas indicate regions of the input that influence the prediction. The saliency map activations focus predominantly on regions with high density of pre-mature atrial contractions.
