code: def _get_mapper_spec(self):
      
      # pylint: disable=g-import-not-at-top
      from mapreduce import model
  
      return model.MapperSpec(
          handler_spec=util._obj_to_path(self.mapper),
          input_reader_spec=util._obj_to_path(self.input_reader_cls),
          params=self._get_mapper_params(),
          shard_count=self.shard_count,
          output_writer_spec=util._obj_to_path(self.output_writer_cls))
docs: Converts self to model.MapperSpec.