yolov7更换ciou

在YOLOv7中，CIoU已经被替换为Wise-IoU。这是一种改进的策略，它可以提升性能并支持其他替换方法，如EIoU、GIoU、DIoU、SIoU等。因此，在YOLOv7的代码中，用到了bbox_iou的损失函数都已经将CIoU替换为了Wise-IoU。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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