code: def shape_backward(inputs, start=None, end=None):
      """
      Args:
        inputs (list of nn.Variable): Incomming grads/inputs to/of the forward function.
        kwargs (dict of arguments): Dictionary of the corresponding function arguments.
  
      Return:
        list of Variable: Return the gradients wrt inputs of the corresponding function.
      """
      return [None]
  
label_desc: Use image node_id 1 for calling a global function with example usage: shape_backward(inputs, start, end) and returns: list