docstr: Return the validation split of the dataset.
docstr_tok: ["Return","the","validation","split","of","the","dataset","."]
code: def validation(self) -> LabeledFrame:
      """Return the validation split of the dataset."""
      if self._validation is not None:
          return self._validation
      else:
          raise ValueError(
              "Data is not loaded yet. Run FolkTables.split_data."
          )
  
file_path: aequitas/src/aequitas/fairflow/datasets/dataset.py
imports: from abc import ABC, abstractmethod
  import pandas
  from ..utils import LabeledFrame
label_desc: Use image node_id 8 for calling the Dataset obj's underlying member method code with example usage: obj.validation() and returns: self