Algorithm 1: Generalised Intersection over Union [24]

input: Two arbitrary convex shapes: A, B ⊆ S ∈ Rn output: GIoU 1 For A and B, find the smallest enclosing convex object C, where C ⊆ S ∈ Rn $IoU=\frac{\left|A\cap B\right|}{\left|A\cup B\right|}$          (1) $\mathrm{G}IoU=IoU-\frac{\left|C\backslash \left(A\cap B\right)\right|}{\left|A\cup B\right|}$   (2)