code: def __assert_prediction_is_none(self, divisions):
      for division in divisions:
          assert getattr(self.data_holdout.prediction, division) is None
  
imports: from hyperparameter_hunter import Environment, CVExperiment
  from hyperparameter_hunter.callbacks.bases import BaseCallback
  from hyperparameter_hunter.settings import G
  from hyperparameter_hunter.utils.learning_utils import get_breast_cancer_data
  from copy import deepcopy
  import pandas
  import pytest
  from sklearn.datasets import load_iris
  from sklearn.metrics import f1_score
  from sklearn.model_selection import train_test_split
  from sklearn.preprocessing import LabelEncoder
  from xgboost import XGBClassifier
label_desc: Use image node_id 10 for calling the DummyExperimentPredictorHoldout obj's underlying member method code with example usage: obj.__assert_prediction_is_none(divisions) without return types