code: def setUp(self):
      self.roi = generate_random_bbox(self.n_roi, (392, 512), 16, 250)
      self.bbox = generate_random_bbox(self.n_bbox, (392, 512), 16, 250)
      self.label = np.random.randint(
          0, self.n_class - 1, size=(self.n_bbox,), dtype=np.int32
      )
  
      self.proposal_target_creator = ProposalTargetCreator(
          n_sample=self.n_sample,
          pos_ratio=self.pos_ratio,
      )
  
file_path: chainercv/tests/links_tests/model_tests/faster_rcnn_tests/utils_tests/test_proposal_target_creator.py
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 ProposalTargetCreator
  from chainercv.utils import generate_random_bbox
label_desc: Use image node_id 1 for calling the TestProposalTargetCreator obj's underlying member method code with example usage: obj.setUp() without return types