class_docstr: Base Class for column ensemble.
class_docstr_tok: ["Base","Class","for","column","ensemble","."]
code: def _estimators(self):
      return [
          (name, estimator) for name, estimator, _ in self.estimators
      ]
  
imports: from itertools import chain
  import numpy
  import pandas
  from sklearn.preprocessing import LabelEncoder
  from sktime.base import _HeterogenousMetaEstimator
  from sktime.classification.base import BaseClassifier
label_desc: Use image node_id 2 for calling the BaseColumnEnsembleClassifier obj's underlying member method code with example usage: obj._estimators() and returns: unknown