code: def test_param_gpu(self):
      self.link.to_device("@cupy:0")
      self.check_param()
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import gradient_check
  from chainer import links
  from chainer import testing
  from chainer import initializers
  from chainer.testing import attr
  from chainer.testing import condition
label_desc: Use image node_id 5 for calling the TestInitialization obj's underlying member method code with example usage: obj.test_param_gpu() without return types