code: def metadata(self):
      return {
          "version": self.version,
          "name": self.name,
          "keys": self.key,
          "num_rows": len(self._data),
      }
  
imports: import datetime
  from abc import ABCMeta, abstractmethod
  import lore
  from lore.env import require
  from lore.util import convert_df_columns_to_json
  import pandas
  import inflection
label_desc: Use image node_id 16 for calling the BaseFeatureExporter obj's underlying member method code with example usage: obj.metadata() and returns: dict