code: def generate_inputs(self):
      x = numpy.random.uniform(-1, 1, self.x_shape).astype(self.dtype)
      return (x,)
  
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 2 for calling the TestUnpoolingND obj's underlying member method code with example usage: obj.generate_inputs() and returns: x