code: def eval_dataset(self):
      return getattr(self, "_eval_dataset", None)
  
imports: import abc
  import logging
  import pickle
  from typing import Dict, List, NamedTuple, Optional, Tuple
  from reagent.core.parameters import NormalizationData
  from reagent.data.data_fetcher import DataFetcher
  from reagent.data.oss_data_fetcher import OssDataFetcher
  from reagent.preprocessing.batch_preprocessor import BatchPreprocessor
  from reagent.workflow.types import Dataset, ReaderOptions, ResourceOptions, RewardOptions, TableSpec
  from .reagent_data_module import ReAgentDataModule
label_desc: Use image node_id 19 for calling the ManualDataModule obj's underlying member method code with example usage: obj.eval_dataset() and returns: getattr