Updated bbox_transform and nms unit test for caffe2 ops. (#16722)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16722
Updated bbox_transform and nms unit test for caffe2 ops.
Differential Revision: D13937416
fbshipit-source-id: 034743d29671c6e73d323a935e2d734ecc071bff
