code: def output_dict(self):
          
          if self._output_dict is None:
              self._output_dict = Executor._get_dict(
                  self._symbol.list_outputs(), self.outputs)
          return self._output_dict
docs: Get dictionary representation of output arrays.
  
          Returns
          -------
          output_dict : dict of str to NDArray
              The dictionary that maps name of output names to NDArrays.
  
          Raises
          ------
          ValueError : if there are duplicated names in the outputs.