code: def forward(self, inputs, device):
      (x,) = inputs
      y = functions.unpooling_nd(
          x, self.ksize, self.stride, self.pad, cover_all=self.cover_all
      )
      return (y,)
  
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 4 for calling the TestUnpoolingND obj's underlying member method code with example usage: obj.forward(inputs, device) and returns: y