code: def _get_instance_data(self):
      if self._dataset_reader is None:
          raise ConfigurationError(
              "To generate instances directly, pass a DatasetReader."
          )
      else:
          yield self._dataset_reader.read(self._input_file)
  
imports: from __future__ import absolute_import
  from __future__ import print_function
  import argparse
  import sys
  import json
  from allennlp.commands.subcommand import Subcommand
  from allennlp.common.checks import check_for_gpu, ConfigurationError
  from allennlp.common.util import lazy_groups_of
  from allennlp.models.archival import load_archive
  from allennlp.predictors.predictor import Predictor, JsonDict
  from allennlp.data import Instance
  from io import open
label_desc: Use image node_id 6 for calling the _PredictManager obj's underlying member method code with example usage: obj._get_instance_data() without return types