Python multiple_fast_inverse Examples

Example #1

File: test_utils.py Project: zhiye9/nilearn

def test_multiple_fast_inverse_errors():
    shape = (2, 2, 2)
    X = np.zeros(shape)
    with pytest.raises(ValueError):
        multiple_fast_inverse(X)

    shape = (10, 20, 20)
    X = np.zeros(shape)
    with pytest.raises(ValueError):
        multiple_fast_inverse(X)

Example #2

File: test_utils.py Project: zhiye9/nilearn

def test_multiple_fast_inv():
    shape = (10, 20, 20)
    X = np.random.randn(shape[0], shape[1], shape[2])
    X_inv_ref = np.zeros(shape)
    for i in range(shape[0]):
        X[i] = np.dot(X[i], X[i].T)
        X_inv_ref[i] = spl.inv(X[i])
    X_inv = multiple_fast_inverse(X)
    assert_almost_equal(X_inv_ref, X_inv)

Example #3

def test_multiple_fast_inv():
    rng = np.random.RandomState(42)
    shape = (10, 20, 20)
    X = rng.standard_normal(size=shape)
    X_inv_ref = np.zeros(shape)
    for i in range(shape[0]):
        X[i] = np.dot(X[i], X[i].T)
        X_inv_ref[i] = spl.inv(X[i])
    X_inv = multiple_fast_inverse(X)
    assert_almost_equal(X_inv_ref, X_inv)