code: def copy_params_from(self, arg_params, aux_params=None, allow_extra_params=False):
          
          for name, array in arg_params.items():
              if name in self.arg_dict:
                  dst = self.arg_dict[name]
                  array.astype(dst.dtype).copyto(dst)
              elif not allow_extra_params:
                  raise ValueError('Find name \"%s\" that is not in the arguments' % name)
  
          if aux_params is None:
              return
  
          for name, array in aux_params.items():
              if name in self.aux_dict:
                  dst = self.aux_dict[name]
                  array.astype(dst.dtype).copyto(dst)
              elif not allow_extra_params:
                  raise ValueError('Find name %s that is not in the auxiliary states' % name)
docs: Copy parameters from arg_params, aux_params into executor's internal array.
  
          Parameters
          ----------
          arg_params : dict of str to NDArray
              Parameters, dict of name to NDArray of arguments.
  
          aux_params : dict of str to NDArray, optional
              Parameters, dict of name to NDArray of auxiliary states.
  
          allow_extra_params : boolean, optional
              Whether allow extra parameters that are not needed by symbol.
              If this is True, no error will be thrown when arg_params or aux_params
              contain extra parameters that is not needed by the executor.
  
          Raises
          ------
          ValueError
              If there is additional parameters in the dict but ``allow_extra_params=False``.
  
          Examples
          --------
          >>> # set parameters with existing model checkpoint
          >>> model_prefix = 'mx_mlp'
          >>> sym, arg_params, aux_params = mx.model.load_checkpoint(model_prefix, 0)
          >>> texec.copy_params_from(arg_params, aux_params)