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: Read-only estimator attribute.
docstr_tok: ["Read-only","estimator","attribute","."]
code: def estimator(self):
      """Read-only estimator attribute."""
      return self._estimator
  
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 3 for calling the BaseStrategy obj's underlying member method code with example usage: obj.estimator() and returns: self