I was reading a paper and this paragraph said that:
The ground truth score is calculated based on the intersectionover- union (IoU) of the perturbed image and the ground truth one. Since we would like to distinguish among IoU values close to 1.0, we use $IOU^3$ as the ground truth score.
I couldn't find any references to this, nor mentioned in the paper. Is it just simply the calculated IoU to the power of 3? Or is it a special kind of IoU calculation method? What does this mean?