code: def test_decode_gpu(self):
      self.coder.to_gpu()
      self._check_decode(
          cuda.to_gpu(self.mb_loc), cuda.to_gpu(self.mb_conf)
      )
  
file_path: chainercv/tests/links_tests/model_tests/ssd_tests/test_multibox_coder.py
imports: import numpy
  import unittest
  from chainer.backends import cuda
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links.model.ssd import MultiboxCoder
label_desc: Use image node_id 10 for calling the TestMultiboxCoder obj's underlying member method code with example usage: obj.test_decode_gpu() without return types