def test_neg_epsilon(self):
X = np.random.random((10, 2))
y = np.random.randint(2, size=10)
clf = GaussianNB(epsilon=-1, bounds=[(0, 1)])
with self.assertRaises(ValueError):
clf.fit(X, y)
def test_sigma(self):
X = np.random.random((10, 2))
y = np.random.randint(2, size=10)
clf = GaussianNB(epsilon=1, bounds=([0, 0], [1, 1]))
clf.fit(X, y)
self.assertIsInstance(clf.sigma_, np.ndarray)
def test_mis_ordered_bounds(self):
X = np.random.random((10, 2))
y = np.random.randint(2, size=10)
clf = GaussianNB(epsilon=1, bounds=[(0, 1), (1, 0)])
with self.assertRaises(ValueError):
clf.fit(X, y)
def test_missing_bounds(self):
X = np.random.random((10, 3))
y = np.random.randint(2, size=10)
clf = GaussianNB(epsilon=1, bounds=([0, 0], [1, 1]))
with self.assertRaises(ValueError):
clf.fit(X, y)
def test_sample_weight_warning(self):
X = np.random.random((10, 2))
y = np.random.randint(2, size=10)
clf = GaussianNB(epsilon=1, bounds=[(0, 1), (0, 1)])
w = abs(np.random.randn(10))
with self.assertWarns(DiffprivlibCompatibilityWarning):
clf.fit(X, y, sample_weight=w)
def test_no_bounds(self):
X = np.random.random((10, 2))
y = np.random.randint(2, size=10)
clf = GaussianNB()
with self.assertWarns(PrivacyLeakWarning):
clf.fit(X, y)
self.assertIsNotNone(clf)
def test_with_iris(self):
global_seed(12345)
from sklearn import datasets
dataset = datasets.load_iris()
x_train, x_test, y_train, y_test = train_test_split(dataset.data, dataset.target, test_size=.2)
bounds = [(4.3, 7.9), (2.0, 4.4), (1.0, 6.9), (0.1, 2.5)]
clf = GaussianNB(epsilon=1.0, bounds=bounds)
clf.fit(x_train, y_train)
accuracy = sum(clf.predict(x_test) == y_test) / y_test.shape[0]
# print(accuracy)
self.assertGreater(accuracy, 0.5)
def test_different_results(self):
from sklearn.naive_bayes import GaussianNB as sk_nb
from sklearn import datasets
global_seed(12345)
dataset = datasets.load_iris()
x_train, x_test, y_train, y_test = train_test_split(dataset.data,
dataset.target,
test_size=.2)
bounds = ([4.3, 2.0, 1.0, 0.1], [7.9, 4.4, 6.9, 2.5])
clf_dp = GaussianNB(epsilon=1.0, bounds=bounds)
clf_non_private = sk_nb()
for clf in [clf_dp, clf_non_private]:
clf.fit(x_train, y_train)
# Todo: remove try...except when sklearn v1.0 is required
try:
nonprivate_var = clf_non_private.var_
except AttributeError:
nonprivate_var = clf_non_private.sigma_
theta_diff = (clf_dp.theta_ - clf_non_private.theta_)**2
self.assertGreater(theta_diff.sum(), 0)
var_diff = (clf_dp.var_ - nonprivate_var)**2
self.assertGreater(var_diff.sum(), 0)
def test_update_mean_variance(self):
X = np.random.random((10, 2))
y = np.random.randint(2, size=10)
clf = GaussianNB(epsilon=1, bounds=([0, 0], [1, 1]))
self.assertIsNotNone(clf._update_mean_variance(0, 0, 0, X, n_noisy=5))
self.assertIsNotNone(clf._update_mean_variance(0, 0, 0, X, n_noisy=0))
self.assertWarns(PrivacyLeakWarning, clf._update_mean_variance, 0, 0,
0, X)
self.assertWarns(DiffprivlibCompatibilityWarning,
clf._update_mean_variance,
0,
0,
0,
X,
n_noisy=1,
sample_weight=1)
def test_accountant(self):
from diffprivlib.accountant import BudgetAccountant
acc = BudgetAccountant()
x_train = np.random.random((10, 2))
y_train = np.random.randint(2, size=10)
clf = GaussianNB(epsilon=1.0, bounds=(0, 1), accountant=acc)
clf.fit(x_train, y_train)
self.assertEqual((1, 0), acc.total())
with BudgetAccountant(1.5, 0) as acc2:
clf = GaussianNB(epsilon=1.0, bounds=(0, 1))
clf.fit(x_train, y_train)
self.assertEqual((1, 0), acc2.total())
with self.assertRaises(BudgetError):
clf.fit(x_train, y_train)
def test_different_results(self):
from sklearn.naive_bayes import GaussianNB as sk_nb
from sklearn import datasets
global_seed(12345)
dataset = datasets.load_iris()
x_train, x_test, y_train, y_test = train_test_split(dataset.data, dataset.target, test_size=.2)
bounds = [(4.3, 7.9), (2.0, 4.4), (1.0, 6.9), (0.1, 2.5)]
clf_dp = GaussianNB(epsilon=1.0, bounds=bounds)
clf_non_private = sk_nb()
for clf in [clf_dp, clf_non_private]:
clf.fit(x_train, y_train)
same_prediction = clf_dp.predict(x_test) == clf_non_private.predict(x_test)
self.assertFalse(np.all(same_prediction))
def test_bad_refit_shape(self):
X = np.random.random((10, 2))
y = np.random.randint(2, size=10)
clf = GaussianNB(epsilon=1, bounds=([0, 0], [1, 1]))
clf.fit(X, y)
X2 = np.random.random((10, 3))
clf.bounds = ([0, 0, 0], [1, 1, 1])
with self.assertRaises(ValueError):
clf.partial_fit(X2, y)
def test_noisy_count(self):
y = np.random.randint(20, size=10000)
actual_counts = np.array([(y == y_i).sum() for y_i in np.unique(y)])
clf = GaussianNB(epsilon=3)
noisy_counts = clf._noisy_class_counts(y)
self.assertEqual(y.shape[0], noisy_counts.sum())
self.assertFalse(np.all(noisy_counts == actual_counts))
clf = GaussianNB(epsilon=float("inf"))
noisy_counts = clf._noisy_class_counts(y)
self.assertEqual(y.shape[0], noisy_counts.sum())
self.assertTrue(np.all(noisy_counts == actual_counts))
def test_with_iris(self):
global_seed(12345)
from sklearn import datasets
dataset = datasets.load_iris()
x_train, x_test, y_train, y_test = train_test_split(dataset.data, dataset.target, test_size=.2)
bounds = ([4.3, 2.0, 1.0, 0.1], [7.9, 4.4, 6.9, 2.5])
clf = GaussianNB(epsilon=5.0, bounds=bounds)
clf.fit(x_train, y_train)
accuracy = clf.score(x_test, y_test)
counts = clf.class_count_.copy()
self.assertGreater(accuracy, 0.45)
clf.partial_fit(x_train, y_train)
new_counts = clf.class_count_
self.assertEqual(np.sum(new_counts), np.sum(counts) * 2)
def test_different_results(self):
from sklearn.naive_bayes import GaussianNB as sk_nb
from sklearn import datasets
global_seed(12345)
dataset = datasets.load_iris()
x_train, x_test, y_train, y_test = train_test_split(dataset.data, dataset.target, test_size=.2)
bounds = ([4.3, 2.0, 1.0, 0.1], [7.9, 4.4, 6.9, 2.5])
clf_dp = GaussianNB(epsilon=1.0, bounds=bounds)
clf_non_private = sk_nb()
for clf in [clf_dp, clf_non_private]:
clf.fit(x_train, y_train)
theta_diff = (clf_dp.theta_ - clf_non_private.theta_) ** 2
self.assertGreater(theta_diff.sum(), 0)
sigma_diff = (clf_dp.sigma_ - clf_non_private.sigma_) ** 2
self.assertGreater(sigma_diff.sum(), 0)
def test_priors(self):
X = np.random.random((10, 2))
y = np.random.randint(2, size=10)
clf = GaussianNB(epsilon=1,
bounds=([0, 0], [1, 1]),
priors=(0.75, 0.25))
self.assertIsNotNone(clf.fit(X, y))
clf = GaussianNB(epsilon=1, bounds=([0, 0], [1, 1]), priors=(1, ))
with self.assertRaises(ValueError):
clf.fit(X, y)
clf = GaussianNB(epsilon=1, bounds=([0, 0], [1, 1]), priors=(0.5, 0.7))
with self.assertRaises(ValueError):
clf.fit(X, y)
clf = GaussianNB(epsilon=1,
bounds=([0, 0], [1, 1]),
priors=(-0.5, 1.5))
with self.assertRaises(ValueError):
clf.fit(X, y)
def test_not_none(self):
clf = GaussianNB(epsilon=1, bounds=[(0, 1)])
self.assertIsNotNone(clf)
