Fix giou naming bug (#5270)

* Adding multiweight support for shufflenetv2 prototype models

* Revert "Adding multiweight support for shufflenetv2 prototype models"

This reverts commit 31fadbee7d1a65cd73ae43dfd4ac6e97e7ca7b01.

* Adding multiweight support for shufflenetv2 prototype models

* Revert "Adding multiweight support for shufflenetv2 prototype models"

This reverts commit 4e3d900f796c1e3e667312087e77956ca4a4c017.

* Remove module vs method name clash

torchvision/ops/__init__.py

@@ -13,7 +13,7 @@ from .boxes import box_convert
 from .deform_conv import deform_conv2d, DeformConv2d
 from .feature_pyramid_network import FeaturePyramidNetwork
 from .focal_loss import sigmoid_focal_loss
-from .generalized_box_iou_loss import generalized_box_iou_loss
+from .giou_loss import generalized_box_iou_loss
 from .misc import FrozenBatchNorm2d, ConvNormActivation, SqueezeExcitation
 from .poolers import MultiScaleRoIAlign
 from .ps_roi_align import ps_roi_align, PSRoIAlign