code: def test_bbox_loc_conversions_consistency_gpu(self):
      self.check_bbox_loc_conversions_consistency(
          cuda.to_gpu(self.src_bbox), cuda.to_gpu(self.dst_bbox)
      )
  
imports: import unittest
  import numpy
  from chainer.backends import cuda
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links.model.faster_rcnn import bbox2loc
  from chainercv.links.model.faster_rcnn import loc2bbox
  from chainercv.utils import generate_random_bbox
label_desc: Use image node_id 4 for calling the TestDeltaEncodeDecodeConsistency obj's underlying member method code with example usage: obj.test_bbox_loc_conversions_consistency_gpu() without return types