def test_vqe_reuse(self):
""" Test vqe reuse """
vqe = VQE()
with self.assertRaises(AquaError):
_ = vqe.run()
num_qubits = self.qubit_op.num_qubits
var_form = RY(num_qubits, depth=3)
vqe.var_form = var_form
with self.assertRaises(AquaError):
_ = vqe.run()
vqe.operator = self.qubit_op
with self.assertRaises(AquaError):
_ = vqe.run()
qinst = QuantumInstance(BasicAer.get_backend('statevector_simulator'))
vqe.quantum_instance = qinst
result = vqe.run()
self.assertAlmostEqual(result.eigenvalue.real, -1.85727503, places=5)
operator = MatrixOperator(np.array([[1, 0, 0, 0],
[0, -1, 0, 0],
[0, 0, 2, 0],
[0, 0, 0, 3]]))
vqe.operator = operator
result = vqe.run()
self.assertAlmostEqual(result.eigenvalue.real, -1.0, places=5)
def test_vqe_reuse(self):
""" Test vqe reuse """
vqe = VQE()
with self.assertRaises(AquaError):
_ = vqe.run()
var_form = TwoLocal(rotation_blocks=['ry', 'rz'],
entanglement_blocks='cz')
vqe.var_form = var_form
with self.assertRaises(AquaError):
_ = vqe.run()
vqe.operator = self.qubit_op
with self.assertRaises(AquaError):
_ = vqe.run()
qinst = QuantumInstance(BasicAer.get_backend('statevector_simulator'))
vqe.quantum_instance = qinst
result = vqe.run()
self.assertAlmostEqual(result.eigenvalue.real, -1.85727503, places=5)
operator = PrimitiveOp(
np.array([[1, 0, 0, 0], [0, -1, 0, 0], [0, 0, 2, 0], [0, 0, 0,
3]]))
vqe.operator = operator
result = vqe.run()
self.assertAlmostEqual(result.eigenvalue.real, -1.0, places=5)
def test_reuse(self):
"""Test re-using a VQE algorithm instance."""
vqe = VQE()
with self.subTest(msg='assert running empty raises AquaError'):
with self.assertRaises(AquaError):
_ = vqe.run()
var_form = TwoLocal(rotation_blocks=['ry', 'rz'],
entanglement_blocks='cz')
vqe.var_form = var_form
with self.subTest(msg='assert missing operator raises AquaError'):
with self.assertRaises(AquaError):
_ = vqe.run()
vqe.operator = self.h2_op
with self.subTest(msg='assert missing backend raises AquaError'):
with self.assertRaises(AquaError):
_ = vqe.run()
vqe.quantum_instance = self.statevector_simulator
with self.subTest(msg='assert VQE works once all info is available'):
result = vqe.run()
self.assertAlmostEqual(result.eigenvalue.real,
self.h2_energy,
places=5)
operator = PrimitiveOp(
np.array([[1, 0, 0, 0], [0, -1, 0, 0], [0, 0, 2, 0], [0, 0, 0,
3]]))
with self.subTest(msg='assert minimum eigensolver interface works'):
result = vqe.compute_minimum_eigenvalue(operator)
self.assertAlmostEqual(result.eigenvalue.real, -1.0, places=5)
