def test_piecewise_regressor_diff(self):
X = numpy.array([[0.1], [0.2], [0.3], [0.4], [0.5]])
Y = numpy.array([1., 1.1, 1.2, 10, 1.4])
clr = LinearRegression()
clr.fit(X, Y)
clq = PiecewiseRegressor(verbose=False)
clq.fit(X, Y)
pred1 = clr.predict(X)
self.assertNotEmpty(pred1)
pred2 = clq.predict(X)
self.assertEqual(len(clq.estimators_), 2)
p1 = clq.estimators_[0].predict(X[:3, :])
p2 = clq.estimators_[1].predict(X[3:, :])
self.assertEqual(pred2[:3], p1)
self.assertEqual(pred2[-2:], p2)
sc = clq.score(X, Y)
self.assertEqual(sc, 1)
def test_piecewise_regressor_no_intercept_bins(self):
X = numpy.array([[0.1, 0.2], [0.2, 0.3], [0.2, 0.35], [0.2, 0.36]])
Y = numpy.array([1., 1.1, 1.15, 1.2])
clr = LinearRegression(fit_intercept=False)
clr.fit(X, Y)
clq = PiecewiseRegressor(binner="bins")
clq.fit(X, Y)
pred1 = clr.predict(X)
pred2 = clq.predict(X)
self.assertEqual(pred1.shape, (4, ))
self.assertEqual(pred2.shape, (4, ))
sc1 = clr.score(X, Y)
sc2 = clq.score(X, Y)
self.assertIsInstance(sc1, float)
self.assertIsInstance(sc2, float)
paths = clq.binner_.transform(X)
self.assertIn(paths.shape, ((4, 7), (4, 8), (4, 9), (4, 10)))
self.assertNotEqual(pred2.min(), pred2.max())
def test_piecewise_regressor_no_intercept(self):
X = numpy.array([[0.1, 0.2], [0.2, 0.3], [0.2, 0.35], [0.2, 0.36]])
Y = numpy.array([1., 1.1, 1.15, 1.2])
clr = LinearRegression(fit_intercept=False)
clr.fit(X, Y)
clq = PiecewiseRegressor()
clq.fit(X, Y)
pred1 = clr.predict(X)
pred2 = clq.predict(X)
self.assertEqual(pred1.shape, (4, ))
self.assertEqual(pred2.shape, (4, ))
sc1 = clr.score(X, Y)
sc2 = clq.score(X, Y)
sc3 = clq.binner_.score(X, Y)
self.assertIsInstance(sc1, float)
self.assertIsInstance(sc2, float)
self.assertIsInstance(sc3, float)
paths = clq.binner_.decision_path(X)
s = paths.sum()
self.assertEqual(s, 8)
self.assertNotEqual(pred2.min(), pred2.max())
self.assertGreater(clq.n_estimators_, 1)