code: def setUp(self):
      n_roi = 1024
      n_mask = 10
      img_size = (392, 512)
      self.roi = generate_random_bbox(n_roi, img_size, 16, 250)
      self.mask = (
          np.random.uniform(size=(n_mask, img_size[0], img_size[1]))
          > 0.5
      )
      self.label = np.random.randint(
          0, self.n_class - 1, size=(n_mask,), dtype=np.int32
      )
  
      self.proposal_target_creator = ProposalTargetCreator(
          n_sample=self.n_sample, pos_ratio=self.pos_ratio
      )
  
file_path: chainercv/tests/experimental_tests/links_tests/model_tests/fcis_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.experimental.links.model.fcis import ProposalTargetCreator
  from chainercv.utils import generate_random_bbox
  from chainercv.utils import mask_to_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