code: def test_gradient_scaling_gpu(self):
      self.target.to_gpu()
      self.check_gradient_scaling()
  
file_path: chainercv/tests/links_tests/model_tests/ssd_tests/test_gradient_scaling.py
imports: import numpy
  import unittest
  import chainer
  from chainer import optimizers
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links.model.ssd import GradientScaling
label_desc: Use image node_id 4 for calling the TestGradientScaling obj's underlying member method code with example usage: obj.test_gradient_scaling_gpu() without return types