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Grad-CAM compared with information bottleneck attribution (IBA) attention maps. Left, Computed tomographic (CT) scan with subtle ground-glass opacities (GGO) pattern. The proposed IBA shows the exact location of pathology without false-positives and precisely, while Grad-CAM fails. Arrows on the first row are pointing to areas within the image that are not true lesions but false positives predicted by Grad-Cam. Arrows on the bottom row point to true lesions not detected by Grad-Cam.
