docstr: Get a `DatasetSentinel` representing an Experiment's `fold_validation_target`
  
  Returns
  -------
  DatasetSentinel:
      A `Sentinel` that will be converted to :attr:`hyperparameter_hunter.experiments.BaseExperiment.fold_validation_target`
      upon `Model` initialization
docstr_tok: ["Get","a","`","DatasetSentinel","`","representing","an","Experiment","'s","`","fold_validation_target","`","Returns","--","--","--","-","DatasetSentinel",":","A","`","Sentinel","`","that","will","be","converted","to",":","attr",":","`","hyperparameter_hunter.experiments.BaseExperiment.fold_validation_target","`","upon","`","Model","`","initialization"]
code: def validation_target(self):
      """Get a `DatasetSentinel` representing an Experiment's `fold_validation_target`
  
      Returns
      -------
      DatasetSentinel:
          A `Sentinel` that will be converted to :attr:`hyperparameter_hunter.experiments.BaseExperiment.fold_validation_target`
          upon `Model` initialization"""
      return DatasetSentinel(
          "oof_target", **self._dataset_sentinel_helper()
      )
  
imports: from hyperparameter_hunter.callbacks.bases import BaseCallback
  from hyperparameter_hunter.i_o.reporting import ReportingHandler
  from hyperparameter_hunter.keys.makers import CrossExperimentKeyMaker
  from hyperparameter_hunter.metrics import format_metrics
  from hyperparameter_hunter.sentinels import DatasetSentinel
  from hyperparameter_hunter.settings import G, ASSETS_DIRNAME, RESULT_FILE_SUB_DIR_PATHS
  from hyperparameter_hunter.utils.boltons_utils import remap
  from hyperparameter_hunter.utils.file_utils import make_dirs, ParametersFromFile
  from hyperparameter_hunter.utils.general_utils import Alias
  from hyperparameter_hunter.utils.result_utils import format_predictions, default_do_full_save
  from inspect import signature, isclass
  import numpy
  import os.path
  import pandas
  from pandas.api.types import is_numeric_dtype
  from typing import List, Optional, Tuple, Union
  from sklearn.model_selection import _split
label_desc: Use image node_id 34 for calling the Environment obj's underlying member method code with example usage: obj.validation_target() and returns: DatasetSentinel