code: def check_weight_is_parameter(self, backend_config):
      layer, hook = self._init_layer()
      layer.to_device(backend_config.device)
      source_weight = getattr(layer, hook.weight_name)
      x = backend_config.get_array(self.x)
      layer(x)
      assert getattr(layer, hook.weight_name) is source_weight
  
imports: import copy
  import os
  import unittest
  import numpy
  import pytest
  import chainer
  from chainer.backends import _cpu
  from chainer.link_hooks.spectral_normalization import SpectralNormalization
  import chainer.links
  from chainer import serializers
  from chainer import testing
  from chainer.testing import attr
  from chainer.testing.backend import BackendConfig
  from chainer import utils
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(backend_config) without return types