code: def check_pickling(self, x_data):
      x = chainer.Variable(x_data)
      y = self.link(x)
      y_data1 = y.data
  
      del x, y
  
      pickled = pickle.dumps(self.link, -1)
      del self.link
      self.link = pickle.loads(pickled)
  
      x = chainer.Variable(x_data)
      y = self.link(x)
      y_data2 = y.data
  
      testing.assert_allclose(y_data1, y_data2, atol=0, rtol=0)
  
imports: import unittest
  import numpy
  import six.moves.cPickle
  import chainer
  from chainer.backends import cuda
  from chainer import gradient_check
  from chainer import links
  from chainer import testing
  from chainer.testing import attr
  from chainer.utils import conv
label_desc: Use image node_id 11 for calling the TestDilatedConvolution2D obj's underlying member method code with example usage: obj.check_pickling(x_data) without return types