code: def setUp(self):
      self.src_bbox = np.array([[0, 0, 49, 29]], dtype=np.float32)
      self.dst_bbox = np.array([[0, 0, 49, 29]], dtype=np.float32)
      self.loc = np.array([[0, 0, 0, 0]], dtype=np.float32)
  
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 1 for calling the TestLocBboxConversions obj's underlying member method code with example usage: obj.setUp() without return types