Fig. 5From: Estimating critical values from electrocardiogram using a deep ordinal convolutional neural networkVisual interpretation of the model. a, b The ECGs of AF and PVCs, which are overlaid with the heat maps calculated by the Grad-CAM method. c, d The weights of heat maps for each stage corresponding to a, b (the highest stage is at the bottom). The red blocks mark the characteristic ECG locationsBack to article page