Exemplo n.º 1
0
def test_scaler():
    """Test scaling of dataset along all axis
    """
    # First test with 1D data
    X = np.random.randn(5)

    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=False)
    assert_array_almost_equal(X_scaled.mean(axis=0), 0.0)
    assert_array_almost_equal(X_scaled.std(axis=0), 1.0)

    X = np.random.randn(4, 5)

    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=False)
    assert_array_almost_equal(X_scaled.mean(axis=0), 5*[0.0])
    assert_array_almost_equal(X_scaled.std(axis=0), 5*[1.0])
    # Check that X has not been copied
    assert X_scaled is X

    X_scaled = scaler.fit(X).transform(X, copy=True)
    assert_array_almost_equal(X_scaled.mean(axis=0), 5*[0.0])
    assert_array_almost_equal(X_scaled.std(axis=0), 5*[1.0])
    # Check that X has not been copied
    assert X_scaled is not X

    X_scaled = scale(X, axis=1, with_std=False)
    assert_array_almost_equal(X_scaled.mean(axis=1), 4*[0.0])
    X_scaled = scale(X, axis=1, with_std=True)
    assert_array_almost_equal(X_scaled.std(axis=1), 4*[1.0])
Exemplo n.º 2
0
def test_scaler():
    """Test scaling of dataset along all axis"""
    # First test with 1D data
    X = np.random.randn(5)

    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=False)
    assert_array_almost_equal(X_scaled.mean(axis=0), 0.0)
    assert_array_almost_equal(X_scaled.std(axis=0), 1.0)

    # Test with 1D list
    X = [0., 1., 2, 0.4, 1.]
    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=False)
    assert_array_almost_equal(X_scaled.mean(axis=0), 0.0)
    assert_array_almost_equal(X_scaled.std(axis=0), 1.0)

    X_scaled = scale(X)
    assert_array_almost_equal(X_scaled.mean(axis=0), 0.0)
    assert_array_almost_equal(X_scaled.std(axis=0), 1.0)

    # Test with 2D data
    X = np.random.randn(4, 5)
    X[:, 0] = 0.0  # first feature is always of zero

    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=True)
    assert not np.any(np.isnan(X_scaled))

    assert_array_almost_equal(X_scaled.mean(axis=0), 5 * [0.0])
    assert_array_almost_equal(X_scaled.std(axis=0), [0., 1., 1., 1., 1.])
    # Check that X has not been copied
    assert X_scaled is not X

    X_scaled = scale(X, axis=1, with_std=False)
    assert not np.any(np.isnan(X_scaled))
    assert_array_almost_equal(X_scaled.mean(axis=1), 4 * [0.0])
    X_scaled = scale(X, axis=1, with_std=True)
    assert not np.any(np.isnan(X_scaled))
    assert_array_almost_equal(X_scaled.mean(axis=1), 4 * [0.0])
    assert_array_almost_equal(X_scaled.std(axis=1), 4 * [1.0])
    # Check that the data hasn't been modified
    assert X_scaled is not X

    X_scaled = scaler.fit(X).transform(X, copy=False)
    assert not np.any(np.isnan(X_scaled))
    assert_array_almost_equal(X_scaled.mean(axis=0), 5 * [0.0])
    assert_array_almost_equal(X_scaled.std(axis=0), [0., 1., 1., 1., 1.])
    # Check that X has not been copied
    assert X_scaled is X

    X = np.random.randn(4, 5)
    X[:, 0] = 1.0  # first feature is a constant, non zero feature
    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=True)
    assert not np.any(np.isnan(X_scaled))
    assert_array_almost_equal(X_scaled.mean(axis=0), 5 * [0.0])
    assert_array_almost_equal(X_scaled.std(axis=0), [0., 1., 1., 1., 1.])
    # Check that X has not been copied
    assert X_scaled is not X
Exemplo n.º 3
0
def test_scaler():
    """Test scaling of dataset along all axis"""
    # First test with 1D data
    X = np.random.randn(5)

    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=False)
    assert_array_almost_equal(X_scaled.mean(axis=0), 0.0)
    assert_array_almost_equal(X_scaled.std(axis=0), 1.0)

    X = np.random.randn(4, 5)

    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=False)
    assert_array_almost_equal(X_scaled.mean(axis=0), 5 * [0.0])
    assert_array_almost_equal(X_scaled.std(axis=0), 5 * [1.0])
    # Check that X has not been copied
    assert X_scaled is X

    X_scaled = scaler.fit(X).transform(X, copy=True)
    assert_array_almost_equal(X_scaled.mean(axis=0), 5 * [0.0])
    assert_array_almost_equal(X_scaled.std(axis=0), 5 * [1.0])
    # Check that X has not been copied
    assert X_scaled is not X

    X_scaled = scale(X, axis=1, with_std=False)
    assert_array_almost_equal(X_scaled.mean(axis=1), 4 * [0.0])
    X_scaled = scale(X, axis=1, with_std=True)
    assert_array_almost_equal(X_scaled.std(axis=1), 4 * [1.0])
    # Check that the data hasn't been modified
    assert X_scaled is not X
Exemplo n.º 4
0
def test_scaler():
    """Test scaling of dataset along all axis"""
    # First test with 1D data
    X = np.random.randn(5)

    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=False)
    assert_array_almost_equal(X_scaled.mean(axis=0), 0.0)
    assert_array_almost_equal(X_scaled.std(axis=0), 1.0)

    # Test with 1D list
    X = [0., 1., 2, 0.4, 1.]
    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=False)
    assert_array_almost_equal(X_scaled.mean(axis=0), 0.0)
    assert_array_almost_equal(X_scaled.std(axis=0), 1.0)

    X_scaled = scale(X)
    assert_array_almost_equal(X_scaled.mean(axis=0), 0.0)
    assert_array_almost_equal(X_scaled.std(axis=0), 1.0)

    # Test with 2D data
    X = np.random.randn(4, 5)
    X[:, 0] = 0.0  # first feature is always of zero

    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=True)
    assert not np.any(np.isnan(X_scaled))

    assert_array_almost_equal(X_scaled.mean(axis=0), 5 * [0.0])
    assert_array_almost_equal(X_scaled.std(axis=0), [0., 1., 1., 1., 1.])
    # Check that X has not been copied
    assert X_scaled is not X

    X_scaled = scale(X, axis=1, with_std=False)
    assert not np.any(np.isnan(X_scaled))
    assert_array_almost_equal(X_scaled.mean(axis=1), 4 * [0.0])
    X_scaled = scale(X, axis=1, with_std=True)
    assert not np.any(np.isnan(X_scaled))
    assert_array_almost_equal(X_scaled.mean(axis=1), 4 * [0.0])
    assert_array_almost_equal(X_scaled.std(axis=1), 4 * [1.0])
    # Check that the data hasn't been modified
    assert X_scaled is not X

    X_scaled = scaler.fit(X).transform(X, copy=False)
    assert not np.any(np.isnan(X_scaled))
    assert_array_almost_equal(X_scaled.mean(axis=0), 5 * [0.0])
    assert_array_almost_equal(X_scaled.std(axis=0), [0., 1., 1., 1., 1.])
    # Check that X has not been copied
    assert X_scaled is X

    X = np.random.randn(4, 5)
    X[:, 0] = 1.0  # first feature is a constant, non zero feature
    scaler = Scaler()
    X_scaled = scaler.fit(X).transform(X, copy=True)
    assert not np.any(np.isnan(X_scaled))
    assert_array_almost_equal(X_scaled.mean(axis=0), 5 * [0.0])
    assert_array_almost_equal(X_scaled.std(axis=0), [0., 1., 1., 1., 1.])
    # Check that X has not been copied
    assert X_scaled is not X
Exemplo n.º 5
0
def test_center_kernel():
    """Test that KernelCenterer is equivalent to Scaler in feature space"""
    X_fit = np.random.random((5, 4))
    scaler = Scaler(with_std=False)
    scaler.fit(X_fit)
    X_fit_centered = scaler.transform(X_fit)
    K_fit = np.dot(X_fit, X_fit.T)

    # center fit time matrix
    centerer = KernelCenterer()
    K_fit_centered = np.dot(X_fit_centered, X_fit_centered.T)
    K_fit_centered2 = centerer.fit_transform(K_fit)
    assert_array_almost_equal(K_fit_centered, K_fit_centered2)

    # center predict time matrix
    X_pred = np.random.random((2, 4))
    K_pred = np.dot(X_pred, X_fit.T)
    X_pred_centered = scaler.transform(X_pred)
    K_pred_centered = np.dot(X_pred_centered, X_fit_centered.T)
    K_pred_centered2 = centerer.transform(K_pred)
    assert_array_almost_equal(K_pred_centered, K_pred_centered2)
def test_center_kernel():
    """Test that KernelCenterer is equivalent to Scaler in feature space"""
    X_fit = np.random.random((5, 4))
    scaler = Scaler(with_std=False)
    scaler.fit(X_fit)
    X_fit_centered = scaler.transform(X_fit)
    K_fit = np.dot(X_fit, X_fit.T)

    # center fit time matrix
    centerer = KernelCenterer()
    K_fit_centered = np.dot(X_fit_centered, X_fit_centered.T)
    K_fit_centered2 = centerer.fit_transform(K_fit)
    assert_array_almost_equal(K_fit_centered, K_fit_centered2)

    # center predict time matrix
    X_pred = np.random.random((2, 4))
    K_pred = np.dot(X_pred, X_fit.T)
    X_pred_centered = scaler.transform(X_pred)
    K_pred_centered = np.dot(X_pred_centered, X_fit_centered.T)
    K_pred_centered2 = centerer.transform(K_pred)
    assert_array_almost_equal(K_pred_centered, K_pred_centered2)
Exemplo n.º 7
0
def test_scaler_without_centering():
    rng = np.random.RandomState(42)
    X = rng.randn(4, 5)
    X[:, 0] = 0.0  # first feature is always of zero

    scaler = Scaler(with_mean=False)
    X_scaled = scaler.fit(X).transform(X, copy=True)
    assert not np.any(np.isnan(X_scaled))

    assert_array_almost_equal(X_scaled.mean(axis=0),
                              [0., -0.01, 2.24, -0.35, -0.78], 2)
    assert_array_almost_equal(X_scaled.std(axis=0), [0., 1., 1., 1., 1.])
    # Check that X has not been copied
    assert X_scaled is not X

    X_scaled = scale(X, with_mean=False)
    assert not np.any(np.isnan(X_scaled))

    assert_array_almost_equal(X_scaled.mean(axis=0),
                              [0., -0.01, 2.24, -0.35, -0.78], 2)
    assert_array_almost_equal(X_scaled.std(axis=0), [0., 1., 1., 1., 1.])
    # Check that X has not been copied
    assert X_scaled is not X
Exemplo n.º 8
0
def test_scaler_without_centering():
    rng = np.random.RandomState(42)
    X = rng.randn(4, 5)
    X[:, 0] = 0.0  # first feature is always of zero

    scaler = Scaler(with_mean=False)
    X_scaled = scaler.fit(X).transform(X, copy=True)
    assert not np.any(np.isnan(X_scaled))

    assert_array_almost_equal(
        X_scaled.mean(axis=0), [0., -0.01,  2.24, -0.35, -0.78], 2)
    assert_array_almost_equal(X_scaled.std(axis=0), [0., 1., 1., 1., 1.])
    # Check that X has not been copied
    assert X_scaled is not X

    X_scaled = scale(X, with_mean=False)
    assert not np.any(np.isnan(X_scaled))

    assert_array_almost_equal(
        X_scaled.mean(axis=0), [0., -0.01,  2.24, -0.35, -0.78], 2)
    assert_array_almost_equal(X_scaled.std(axis=0), [0., 1., 1., 1., 1.])
    # Check that X has not been copied
    assert X_scaled is not X