docstr: Feature engineering stage during which the `EngineerStep` will be executed
code: def stage(self) -> str:
      """Feature engineering stage during which the `EngineerStep` will be executed"""
      if self._stage is None:
          self._stage = get_engineering_step_stage(self.params)
      return self._stage
  
imports: from hyperparameter_hunter.keys.hashing import make_hash_sha256
  from hyperparameter_hunter.space.dimensions import Categorical, RejectedOptional
  from hyperparameter_hunter.utils.boltons_utils import remap, default_visit, default_enter
  from hyperparameter_hunter.utils.general_utils import subdict
  import ast
  from contextlib import suppress
  from inspect import getsource
  import numpy
  import pandas
  from typing import List, Callable, Dict, Union, Tuple
label_desc: Use image node_id 10 for calling the EngineerStep obj's underlying member method code with example usage: obj.stage() and returns: self