code: def test_proposal_creator_gpu(self):
      self.check_proposal_creator(
          self.proposal_creator,
          cuda.to_gpu(self.bbox_d),
          cuda.to_gpu(self.score),
          cuda.to_gpu(self.anchor),
          self.img_size,
          scale=1.0,
      )
  
file_path: chainercv/tests/links_tests/model_tests/faster_rcnn_tests/utils_tests/test_proposal_creator.py
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links.model.faster_rcnn import ProposalCreator
  from chainercv.utils import generate_random_bbox
label_desc: Use image node_id 4 for calling the TestProposalCreator obj's underlying member method code with example usage: obj.test_proposal_creator_gpu() without return types