class_docstr: Base class for query-by-committee setup.
  Args:
      learner_list: List of ActiveLearner objects to form committee.
      query_strategy: Function to query labels.
      on_transformed: Whether to transform samples with the pipeline defined by each learner's estimator
          when applying the query strategy.
docstr: Fits all learners to the training data and labels provided to it so far.
  Args:
      bootstrap: If True, each estimator is trained on a bootstrapped dataset. Useful when
          using bagging to build the ensemble.
      **fit_kwargs: Keyword arguments to be passed to the fit method of the predictor.
docstr_tok: ["Fits","all","learners","to","the","training","data","and","labels","provided","to","it","so","far",".","Args",":","bootstrap",":","If","True",",","each","estimator","is","trained","on","a","bootstrapped","dataset",".","Useful","when","using","bagging","to","build","the","ensemble",".","*","*","fit_kwargs",":","Keyword","arguments","to","be","passed","to","the","fit","method","of","the","predictor","."]
code: def _fit_to_known(
      self, bootstrap: bool = False, **fit_kwargs
  ) -> None:
      """
      Fits all learners to the training data and labels provided to it so far.
      Args:
          bootstrap: If True, each estimator is trained on a bootstrapped dataset. Useful when
              using bagging to build the ensemble.
          **fit_kwargs: Keyword arguments to be passed to the fit method of the predictor.
      """
      for learner in self.learner_list:
          learner._fit_to_known(bootstrap=bootstrap, **fit_kwargs)
  
imports: import abc
  import sys
  import warnings
  from typing import Any, Callable, Iterator, List, Tuple, Union
  import numpy
  import scipy.sparse
  from modAL.utils.data import data_hstack, modALinput, retrieve_rows
  from sklearn.base import BaseEstimator
  from sklearn.ensemble._base import _BaseHeterogeneousEnsemble
  from sklearn.pipeline import Pipeline
label_desc: Use image node_id 5 for calling the BaseCommittee obj's underlying member method code with example usage: obj._fit_to_known(bootstrap) without return types