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Calculates the GIOU between proposal and ground truth boxes.
tfm.vision.box_ops.bbox_generalized_overlap( boxes, gt_boxes )
The generalized intersection of union is an adjustment of the traditional IOU
metric which provides continuous updates even for predictions with no overlap.
This metric is defined in https://giou.stanford.edu/GIoU.pdf Note, some
gt_boxes may have been padded. The returned
giou tensor for these boxes
will be -1.