Before revision:  Using our method instead of Guided Backprop,  class activation methods such as Grad-CAM , Grad-CAM+ + and Smooth Grad-CAM + + will run several orders of magnitude faster, have a significantly smaller memory footprint and be more accurate .
After revision:  Using our method instead of Guided Backprop, class activation methods such as Grad-CAM , Grad-CAM+ + and Smooth Grad-CAM + seem to yield demonstrably superior results without sacrificing speed .