RTMDet different loss than official paper ?

[PushpakBhoge]

The official paper of RTM Det https://arxiv.org/pdf/2212.07784 link the RTMDet of mmdet as official implementation of the paper but there is one weird thing I have noticed that official paper mentions that the bbox_loss is -log(IOU)

but in config it using GIOU loss ? I thought maybe in code this log was being taken but I did not find any such operations in class RTMDetHead method ?

is there any reason why this part is different from the paper ? Also why have GIoU loss and not CIoU loss

tagging authors here thank you for your help @RangiLyu @ZwwWayne