class_docstr: Abstract base strategy class.
  
  Implements attributes and operations shared by all strategies, including input and
  compatibility checks between passed estimator, data and task.
docstr: Provide read only access via keys to the private traits.
docstr_tok: ["Provide","read","only","access","via","keys","to","the","private","traits","."]
code: def __getitem__(self, key):
      """Provide read only access via keys to the private traits."""
      if key not in self._traits.keys():
          raise KeyError
      return self._traits[key]
  
imports: import pandas
  from joblib import dump, load
  from sklearn.base import ClassifierMixin, RegressorMixin
  from sklearn.model_selection import GridSearchCV, RandomizedSearchCV
  from sklearn.pipeline import Pipeline
  from sktime.base import BaseEstimator
  from sktime.classification.base import BaseClassifier
  from sktime.forecasting.base._sktime import BaseForecaster
  from sktime.regression.base import BaseRegressor
label_desc: Use image node_id 4 for calling the BaseStrategy obj's underlying member method code with example usage: obj.__getitem__(key) and returns: self