code: def _extract(param_names: List[str],
               params: Dict[str, mx.nd.NDArray],
               ext_params: Dict[str, np.ndarray]) -> List[str]:
      
      remaining_param_names = list(param_names)
      for name in param_names:
          if name in params:
              logger.info("\tFound '%s': shape=%s", name, str(params[name].shape))
              ext_params[name] = params[name].asnumpy()
              remaining_param_names.remove(name)
      return remaining_param_names
docs: Extract specific parameters from a given base.
  
      :param param_names: Names of parameters to be extracted.
      :param params: Mapping from parameter names to the actual NDArrays parameters.
      :param ext_params: Extracted parameter dictionary.
      :return: Remaining names of parameters to be extracted.