def test_invalid_target(self, interface):
with pytest.raises(ValueError, match="Input target of incorrect length 2 instead of 1"):
num_qubits = 1
dev = qml.device("default.qubit", wires=num_qubits)
observables = [qml.PauliZ(0)]
loss = SquaredErrorLoss(rx_ansatz, observables, dev, interface=interface)
phis = np.ones(num_qubits)
loss(phis, target=np.array([1.0, 2.0]))
def test_no_target(self, interface):
with pytest.raises(ValueError, match="The target cannot be None"):
num_qubits = 1
dev = qml.device("default.qubit", wires=num_qubits)
observables = [qml.PauliZ(0)]
loss = SquaredErrorLoss(rx_ansatz, observables, dev, interface=interface)
phis = np.ones(num_qubits)
loss(phis)
def test_deprecation_warning():
"""Test if deprecation warning is raised"""
if int(qml.__version__.split(".")[1]) >= 16:
pytest.fail(
"Deprecation warnings for the qnn module should be removed")
dev = qml.device("default.qubit", wires=3)
observables = [qml.PauliZ(0), qml.PauliX(0), qml.PauliZ(1) @ qml.PauliZ(2)]
with pytest.warns(DeprecationWarning, match=WARNING_STRING):
SquaredErrorLoss(rx_ansatz, observables, dev)
def test_rx_circuit(self, interface):
num_qubits = 3
dev = qml.device("default.qubit", wires=num_qubits)
observables = [qml.PauliZ(0), qml.PauliX(0), qml.PauliZ(1) @ qml.PauliZ(2)]
loss = SquaredErrorLoss(rx_ansatz, observables, dev, interface=interface)
phis = np.ones(num_qubits)
res = loss(phis, target=np.array([1.0, 0.5, 0.1]))
assert np.allclose(res, np.array([0.21, 0.25, 0.03]), atol=0.01, rtol=0.01)
def test_layer_circuit(self, interface):
num_qubits = 3
dev = qml.device("default.qubit", wires=num_qubits)
observables = [qml.PauliZ(0), qml.PauliX(0), qml.PauliZ(1) @ qml.PauliZ(2)]
loss = SquaredErrorLoss(layer_ansatz, observables, dev, interface=interface)
weights = np.ones((num_qubits, 3, 3))
res = loss(weights, x=np.array([1.0, 2.0, 1.0]), target=np.array([1.0, 0.5, 0.1]))
assert np.allclose(res, np.array([0.88, 0.83, 0.05]), atol=0.01, rtol=0.01)