parameters: (self, *output_grads)
docstring: Backward computation.
  
          Takes as many inputs as forward's outputs,
          and returns as many NDArrays as forward's inputs.
docstring_summary: Backward computation.
docstring_tokens: Backward computation .
function: def backward(self, *output_grads):
          """Backward computation.
  
          Takes as many inputs as forward's outputs,
          and returns as many NDArrays as forward's inputs.
          """
          raise NotImplementedError
function_tokens: def backward ( self , * output_grads ) : raise NotImplementedError