code: def on_fold_end(self):
      self.data_oof.target.on_fold_end(self.validation_index)
      super().on_fold_end()
  
imports: from hyperparameter_hunter.callbacks.bases import BaseTargetWranglerCallback
  from hyperparameter_hunter.data import TrainDataset, OOFDataset, HoldoutDataset
label_desc: Use image node_id 6 for calling the WranglerTargetOOF obj's underlying member method code with example usage: obj.on_fold_end() without return types