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Calculates the GIOU between proposal and ground truth 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.
Tensor with as a shape of [batch_size, N, max_num_instances].