class_docstr: Unpooling over a set of N-dimensional planes.
  
  .. warning::
  
      This feature is experimental. The interface can change in the future.
code: def backward(self, indexes, grad_outputs):
      return UnpoolingNDGrad(self).apply(grad_outputs)
  
imports: import numpy
  import six
  from chainer import backend
  from chainer import function_node
  from chainer.functions.pooling import pooling_nd
  from chainer.utils import conv
  from chainer.utils import conv_nd
  from chainer.utils import type_check
label_desc: Use image node_id 4 for calling the UnpoolingND obj's underlying member method code with example usage: obj.backward(indexes, grad_outputs) and returns: UnpoolingNDGrad