def test_fake_nodes_factory():
"""Test FakeNodesFactory in a specific regime in which the fake nodes
interpolation method works well.
"""
fac = FakeNodesFactory(UNIFORM_X)
assert not fac._opt_params
fac.run_classical(f_runge)
zne_value = fac.reduce()
assert np.isclose(zne_value, f_runge(0.0), atol=LARGE_TOL)
assert len(fac._opt_params) == len(UNIFORM_X)
assert np.isclose(fac._opt_params[-1], zne_value)
def test_fake_nodes_factory():
"""Test FakeNodesFactory in a specific regime in which the fake nodes
interpolation method works well.
"""
fac = FakeNodesFactory(UNIFORM_X)
assert not fac._opt_params
fac.run_classical(f_runge)
zne_value = fac.reduce()
assert np.isclose(zne_value, f_runge(0.0), atol=LARGE_TOL)
assert len(fac._opt_params) == len(UNIFORM_X)
assert np.isclose(fac._opt_params[-1], zne_value)
assert np.isclose(fac.extrapolate(UNIFORM_X, f_runge(UNIFORM_X)),
zne_value)
exp_vals = fac.get_expectation_values()
assert np.isclose(fac.extrapolate(UNIFORM_X, exp_vals), zne_value)
assert np.isclose(
fac.extrapolate(UNIFORM_X, exp_vals, full_output=True)[0],
zne_value,
)