def test_hessian(self):
"""Check the hessian function returns the correct values."""
clf = RVC()
x = np.array([[1, 2], [3, 4]])
y = np.array([[5, 6], [7, 8]])
phi = clf._apply_kernel(x, y)
alpha = np.ones(3)
m = np.ones(3)
t = np.array([1, 0])
hessian = clf._hessian(m, alpha, phi, t)
h_target = np.array([[1, 4.018e-10, 3.571e-03],
[4.018e-10, 1, 2.194e-08],
[3.571e-03, 2.194e-08, 1.392]])
np.testing.assert_allclose(hessian, h_target, rtol=1e-3)
