code: def check_bbox2loc(self, src_bbox, dst_bbox, loc):
      pred_loc = bbox2loc(src_bbox, dst_bbox)
  
      self.assertIsInstance(pred_loc, type(loc))
      np.testing.assert_equal(cuda.to_cpu(pred_loc), cuda.to_cpu(loc))
  
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 2 for calling the TestLocBboxConversions obj's underlying member method code with example usage: obj.check_bbox2loc(src_bbox, dst_bbox, loc) without return types