code: def forward_expected(self, inputs):
      (x,) = inputs
      outs = self.gy_shape[2:]
      y_expected = expected_unpooling_nd(
          x, outs, self.ksize, self.stride, self.pad
      )
      return (y_expected,)
  
imports: import itertools
  import unittest
  import numpy
  import six
  import chainer
  from chainer import backend
  from chainer import functions
  from chainer import testing
  from chainer.utils import conv
  from chainer.utils import type_check
label_desc: Use image node_id 3 for calling the TestUnpoolingND obj's underlying member method code with example usage: obj.forward_expected(inputs) and returns: y_expected