def test_abs_error_normalized(self):
tab = Table('housing')
normalizer = Normalize(zero_based=True,
norm_type=Normalize.NormalizeBySpan)
tab = normalizer(tab)
icr = InductiveRegressor(AbsError(LinearRegressionLearner()))
icr_knn = InductiveRegressor(AbsError(KNNRegressionLearner(4)))
icr_norm = InductiveRegressor(
AbsErrorNormalized(KNNRegressionLearner(4),
Euclidean,
4,
exp=False))
icr_norm_exp = InductiveRegressor(
AbsErrorNormalized(KNNRegressionLearner(4), Euclidean, 4,
exp=True))
icr_norm_rf = InductiveRegressor(
AbsErrorNormalized(KNNRegressionLearner(4),
Euclidean,
4,
rf=RandomForestRegressor()))
r, r_knn, r_norm, r_norm_exp, r_norm_rf = ResultsRegr(), ResultsRegr(
), ResultsRegr(), ResultsRegr(), ResultsRegr()
eps = 0.05
for rep in range(10):
for train, test in CrossSampler(tab, 10):
train, calibrate = next(
RandomSampler(train,
len(train) - 100, 100))
r.concatenate(run_train_test(icr, eps, train, test, calibrate))
r_knn.concatenate(
run_train_test(icr_knn, eps, train, test, calibrate))
r_norm.concatenate(
run_train_test(icr_norm, eps, train, test, calibrate))
r_norm_exp.concatenate(
run_train_test(icr_norm_exp, eps, train, test, calibrate))
r_norm_rf.concatenate(
run_train_test(icr_norm_rf, eps, train, test, calibrate))
print(r.median_range(), r.interdecile_mean(), 1 - r.accuracy())
print(r_knn.median_range(), r_knn.interdecile_mean(),
1 - r_knn.accuracy())
print(r_norm.median_range(), r_norm.interdecile_mean(),
1 - r_norm.accuracy())
print(r_norm_exp.median_range(), r_norm_exp.interdecile_mean(),
1 - r_norm_exp.accuracy())
print(r_norm_rf.median_range(), r_norm_rf.interdecile_mean(),
1 - r_norm_rf.accuracy())
self.assertGreater(r.accuracy(), 1 - eps - 0.03)
self.assertGreater(r_knn.accuracy(), 1 - eps - 0.03)
self.assertGreater(r_norm.accuracy(), 1 - eps - 0.03)
self.assertGreater(r_norm_exp.accuracy(), 1 - eps - 0.03)
self.assertGreater(r_norm_rf.accuracy(), 1 - eps - 0.03)
"""
def test_nc_type(self):
nc_regr = AbsError(LinearRegressionLearner())
nc_class = InverseProbability(LogisticRegressionLearner())
InductiveRegressor(nc_regr)
self.assertRaises(AssertionError, InductiveRegressor, nc_class)
CrossRegressor(nc_regr, 5)
self.assertRaises(AssertionError, CrossRegressor, nc_class, 5)
def test_error_model(self):
for loo in [False, True]:
icr = InductiveRegressor(
ErrorModelNC(LinearRegressionLearner(),
LinearRegressionLearner(),
loo=loo), self.train, self.calibrate)
lo, hi = icr(self.test.x, 0.1)
self.assertLess(hi - lo, 30.0)
icr = InductiveRegressor(AbsError(RandomForestRegressionLearner()))
r = run(icr, 0.1, CrossSampler(Table('housing'), 20))
self.assertGreater(r.accuracy(), 0.85)
print(r.accuracy(), r.median_range(), r.interdecile_mean())
icr = InductiveRegressor(
ErrorModelNC(RandomForestRegressionLearner(),
LinearRegressionLearner()))
r = run(icr, 0.1, CrossSampler(Table('housing'), 20))
self.assertGreater(r.accuracy(), 0.85)
print(r.accuracy(), r.median_range(), r.interdecile_mean())
icr = InductiveRegressor(
ErrorModelNC(RandomForestRegressionLearner(),
LinearRegressionLearner(),
loo=True))
r = run(icr, 0.1, CrossSampler(Table('housing'), 20))
self.assertGreater(r.accuracy(), 0.85)
print(r.accuracy(), r.median_range(), r.interdecile_mean())
def test_run(self):
tab = Table('iris')
cp = CrossClassifier(InverseProbability(LogisticRegressionLearner()),
5)
r = run(cp, 0.1, RandomSampler(tab, 4, 1), rep=3)
self.assertEqual(len(r.preds), 3 * 1 / 5 * len(tab))
tab = Table('housing')
cr = InductiveRegressor(AbsError(LinearRegressionLearner()))
r = run(cr, 0.1, CrossSampler(tab, 4), rep=3)
self.assertEqual(len(r.preds), 3 * len(tab))
def test_loo(self):
train, test = get_instance(Table('iris'), 0)
loocp = LOOClassifier(InverseProbability(LogisticRegressionLearner()),
train)
pred = loocp(test.x, 0.1)
self.assertEqual(pred, ['Iris-setosa'])
train, test = get_instance(Table('housing'), 0)
loocr = LOORegressor(AbsError(LinearRegressionLearner()), train)
lo, hi = loocr(test.x, 0.1)
self.assertLess(hi - lo, 20)
def test_validate_cross_regression(self):
tab = shuffle_data(Table('housing'))
eps = 0.1
correct, num, all = 0, 0, len(tab)
for i in range(all):
train, test = get_instance(tab, i)
ccr = CrossRegressor(AbsError(LinearRegressionLearner()), 5,
shuffle_data(train))
y_min, y_max = ccr(test.x, eps)
if y_min <= test.y <= y_max: correct += 1
num += y_max - y_min
self.assertAlmostEqual(correct / all, 1.0 - eps, delta=0.02)
def test_validate_regression(self):
tab = Table('housing')
eps = 0.1
correct, num, all = 0, 0, len(tab)
for i in range(all):
train, test = get_instance(tab, i)
train, calibrate = split_data(shuffle_data(train), 2, 1)
icr = InductiveRegressor(AbsError(LinearRegressionLearner()),
train, calibrate)
y_min, y_max = icr(test.x, eps)
if y_min <= test.y <= y_max: correct += 1
num += y_max - y_min
self.assertAlmostEqual(correct / all, 1.0 - eps, delta=0.02)