code: def check_weight_is_parameter(self, gpu):
      layer, hook = self._init_layer()
      if gpu:
          with testing.assert_warns(DeprecationWarning):
              layer = layer.to_gpu()
      source_weight = getattr(layer, hook.weight_name)
      x = cuda.to_gpu(self.x) if gpu else self.x
      layer(x)
      assert getattr(layer, hook.weight_name) is source_weight
  
imports: import unittest
  import numpy
  import pytest
  import chainer
  from chainer.backends import cuda
  from chainer.link_hooks.weight_standardization import WeightStandardization
  import chainer.links
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 3 for calling the BaseTest obj's underlying member method code with example usage: obj.check_weight_is_parameter(gpu) without return types