class_docstr: Depth to space transformation.
code: def backward(self, indexes, grad_outputs):
      (gy,) = grad_outputs
      gy = chainer.functions.space2depth(gy, self.r)
      return (gy,)
  
file_path: chainer/chainer/functions/array/depth2space.py
imports: import numpy
  import chainer
  from chainer import backend
  from chainer import function_node
  from chainer.utils import type_check
label_desc: Use image node_id 4 for calling the Depth2Space obj's underlying member method code with example usage: obj.backward(indexes, grad_outputs) and returns: gy