scikit-learn/sklearn/ensemble/tests/test_voting_classifier.py

"""Testing for the boost module (sklearn.ensemble.boost)."""

import numpy as np
from sklearn.utils.testing import assert_almost_equal
from sklearn.utils.testing import assert_equal
from sklearn.linear_model import LogisticRegression
from sklearn.naive_bayes import GaussianNB
from sklearn.ensemble import RandomForestClassifier
from sklearn.ensemble import VotingClassifier
from sklearn.grid_search import GridSearchCV
from sklearn import datasets
from sklearn import cross_validation
from sklearn.datasets import make_multilabel_classification
from sklearn.svm import SVC
from sklearn.multiclass import OneVsRestClassifier

# Load the iris dataset and randomly permute it
iris = datasets.load_iris()
X, y = iris.data[:, 1:3], iris.target


def test_majority_label_iris():
    """Check classification by majority label on dataset iris."""
    clf1 = LogisticRegression(random_state=123)
    clf2 = RandomForestClassifier(random_state=123)
    clf3 = GaussianNB()
    eclf = VotingClassifier(estimators=[
                ('lr', clf1), ('rf', clf2), ('gnb', clf3)],
                voting='hard')
    scores = cross_validation.cross_val_score(eclf,
                                              X,
                                              y,
                                              cv=5,
                                              scoring='accuracy')
    assert_almost_equal(scores.mean(), 0.95, decimal=2)


def test_tie_situation():
    """Check voting classifier selects smaller class label in tie situation."""
    clf1 = LogisticRegression(random_state=123)
    clf2 = RandomForestClassifier(random_state=123)
    eclf = VotingClassifier(estimators=[('lr', clf1), ('rf', clf2)],
                            voting='hard')
    assert_equal(clf1.fit(X, y).predict(X)[73], 2)
    assert_equal(clf2.fit(X, y).predict(X)[73], 1)
    assert_equal(eclf.fit(X, y).predict(X)[73], 1)


def test_weights_iris():
    """Check classification by average probabilities on dataset iris."""
    clf1 = LogisticRegression(random_state=123)
    clf2 = RandomForestClassifier(random_state=123)
    clf3 = GaussianNB()
    eclf = VotingClassifier(estimators=[
                            ('lr', clf1), ('rf', clf2), ('gnb', clf3)],
                            voting='soft',
                            weights=[1, 2, 10])
    scores = cross_validation.cross_val_score(eclf,
                                              X,
                                              y,
                                              cv=5,
                                              scoring='accuracy')
    assert_almost_equal(scores.mean(), 0.93, decimal=2)


def test_predict_on_toy_problem():
    """Manually check predicted class labels for toy dataset."""
    clf1 = LogisticRegression(random_state=123)
    clf2 = RandomForestClassifier(random_state=123)
    clf3 = GaussianNB()

    X = np.array([[-1.1, -1.5],
                  [-1.2, -1.4],
                  [-3.4, -2.2],
                  [1.1, 1.2],
                  [2.1, 1.4],
                  [3.1, 2.3]])

    y = np.array([1, 1, 1, 2, 2, 2])

    assert_equal(all(clf1.fit(X, y).predict(X)), all([1, 1, 1, 2, 2, 2]))
    assert_equal(all(clf2.fit(X, y).predict(X)), all([1, 1, 1, 2, 2, 2]))
    assert_equal(all(clf3.fit(X, y).predict(X)), all([1, 1, 1, 2, 2, 2]))

    eclf = VotingClassifier(estimators=[
                            ('lr', clf1), ('rf', clf2), ('gnb', clf3)],
                            voting='hard',
                            weights=[1, 1, 1])
    assert_equal(all(eclf.fit(X, y).predict(X)), all([1, 1, 1, 2, 2, 2]))

    eclf = VotingClassifier(estimators=[
                            ('lr', clf1), ('rf', clf2), ('gnb', clf3)],
                            voting='soft',
                            weights=[1, 1, 1])
    assert_equal(all(eclf.fit(X, y).predict(X)), all([1, 1, 1, 2, 2, 2]))


def test_predict_proba_on_toy_problem():
    """Calculate predicted probabilities on toy dataset."""
    clf1 = LogisticRegression(random_state=123)
    clf2 = RandomForestClassifier(random_state=123)
    clf3 = GaussianNB()
    X = np.array([[-1.1, -1.5], [-1.2, -1.4], [-3.4, -2.2], [1.1, 1.2]])
    y = np.array([1, 1, 2, 2])

    clf1_res = np.array([[0.59790391, 0.40209609],
                         [0.57622162, 0.42377838],
                         [0.50728456, 0.49271544],
                         [0.40241774, 0.59758226]])

    clf2_res = np.array([[0.8, 0.2],
                         [0.8, 0.2],
                         [0.2, 0.8],
                         [0.3, 0.7]])

    clf3_res = np.array([[0.9985082, 0.0014918],
                         [0.99845843, 0.00154157],
                         [0., 1.],
                         [0., 1.]])

    t00 = (2*clf1_res[0][0] + clf2_res[0][0] + clf3_res[0][0]) / 4
    t11 = (2*clf1_res[1][1] + clf2_res[1][1] + clf3_res[1][1]) / 4
    t21 = (2*clf1_res[2][1] + clf2_res[2][1] + clf3_res[2][1]) / 4
    t31 = (2*clf1_res[3][1] + clf2_res[3][1] + clf3_res[3][1]) / 4

    eclf = VotingClassifier(estimators=[
                            ('lr', clf1), ('rf', clf2), ('gnb', clf3)],
                            voting='soft',
                            weights=[2, 1, 1])
    eclf_res = eclf.fit(X, y).predict_proba(X)

    assert_almost_equal(t00, eclf_res[0][0], decimal=1)
    assert_almost_equal(t11, eclf_res[1][1], decimal=1)
    assert_almost_equal(t21, eclf_res[2][1], decimal=1)
    assert_almost_equal(t31, eclf_res[3][1], decimal=1)

    try:
        eclf = VotingClassifier(estimators=[
                                ('lr', clf1), ('rf', clf2), ('gnb', clf3)],
                                voting='hard')
        eclf.fit(X, y).predict_proba(X)

    except AttributeError:
        pass
    else:
        raise AssertionError('AttributeError for voting == "hard"'
                             ' and with predict_proba not raised')


def test_multilabel():
    """Check if error is raised for multilabel classification."""
    X, y = make_multilabel_classification(n_classes=2, n_labels=1,
                                          allow_unlabeled=False,
                                          random_state=123)
    clf = OneVsRestClassifier(SVC(kernel='linear'))

    eclf = VotingClassifier(estimators=[('ovr', clf)], voting='hard')

    try:
        eclf.fit(X, y)
    except NotImplementedError:
        return


def test_gridsearch():
    """Check GridSearch support."""
    clf1 = LogisticRegression(random_state=1)
    clf2 = RandomForestClassifier(random_state=1)
    clf3 = GaussianNB()
    eclf = VotingClassifier(estimators=[
                ('lr', clf1), ('rf', clf2), ('gnb', clf3)],
                voting='soft')

    params = {'lr__C': [1.0, 100.0],
              'voting': ['soft', 'hard'],
              'weights': [[0.5, 0.5, 0.5], [1.0, 0.5, 0.5]]}

    grid = GridSearchCV(estimator=eclf, param_grid=params, cv=5)
    grid.fit(iris.data, iris.target)