code: def test_not_fitted():
      np.random.seed(123)
      meta = LogisticRegression(multi_class="ovr", solver="liblinear")
      clf1 = RandomForestClassifier(n_estimators=10)
      clf2 = GaussianNB()
      sclf = StackingCVClassifier(
          classifiers=[clf1, clf2],
          use_probas=True,
          meta_classifier=meta,
          shuffle=False,
      )
  
      X, y = iris_data()
      assert_raises(
          NotFittedError,
          "This StackingCVClassifier instance is not fitted yet."
          " Call 'fit' with appropriate arguments"
          " before using this method.",
          sclf.predict,
          X,
      )
  
      assert_raises(
          NotFittedError,
          "This StackingCVClassifier instance is not fitted yet."
          " Call 'fit' with appropriate arguments"
          " before using this method.",
          sclf.predict_proba,
          X,
      )
  
      assert_raises(
          NotFittedError,
          "This StackingCVClassifier instance is not fitted yet."
          " Call 'fit' with appropriate arguments"
          " before using this method.",
          sclf.predict_meta_features,
          X,
      )
  
imports: import random
  import numpy
  import pandas
  import pytest
  from packaging.version import Version
  from scipy import sparse
  from sklearn import __version__
  from sklearn import datasets, exceptions
  from sklearn.base import clone
  from sklearn.ensemble import RandomForestClassifier
  from sklearn.linear_model import LogisticRegression, PassiveAggressiveClassifier
  from sklearn.metrics import roc_auc_score
  from sklearn.model_selection import GridSearchCV, KFold, cross_val_score, train_test_split
  from sklearn.naive_bayes import GaussianNB
  from sklearn.neighbors import KNeighborsClassifier
  from sklearn.svm import SVC
  from mlxtend.classifier import StackingCVClassifier
  from mlxtend.data import iris_data
  from mlxtend.externals.estimator_checks import NotFittedError
  from mlxtend.utils import assert_raises
label_desc: Use image node_id 14 for calling a global function with example usage: test_not_fitted() without return types