class_docstr: Class for black-box regressors.
docstr: Return the prediction function.
  
  :return: The prediction function.
docstr_tok: ["Return","the","prediction","function",".",":","return",":","The","prediction","function","."]
code: def predict_fn(self) -> Callable:
      """
      Return the prediction function.
  
      :return: The prediction function.
      """
      return self._predict_fn
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  from functools import total_ordering
  import logging
  from typing import Callable, List, Optional, Union, Tuple, TYPE_CHECKING
  import numpy
  from art.estimators.estimator import BaseEstimator
  from art.estimators.regression.regressor import RegressorMixin, Regressor
  from art.estimators.classification import BlackBoxClassifier
label_desc: Use image node_id 3 for calling the BlackBoxRegressor obj's underlying member method code with example usage: obj.predict_fn() and returns: self