code: def get_normalization_data_map(
      self,
      keys: Optional[List[str]] = None,
  ) -> Dict[str, NormalizationData]:
      return self._normalization_data_map
  
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 7 for calling the ManualDataModule obj's underlying member method code with example usage: obj.get_normalization_data_map(keys) and returns: self