Questions about the implementation of the IOU

[Chaolei98]

Thanks to the authors for introducing the pre-trained ViL model in the ZSTAD domain, especially making the code publicly available to give more reference to that community. I can't understand the code of the IOU implementation very well, it seems to me that "Aand" shoule be implemented by "min(e1, e2) - max(s1, s2)" and returns "Aand / Aor" directly, however, when I do this, the mAP drops. Is it a variant of IOU, I would appreciate if you could help me with this confusion.