def test_exactcover_vqe(self): algorithm_cfg = { 'name': 'VQE', 'operator_mode': 'matrix', 'max_evals_grouped': 2 } optimizer_cfg = {'name': 'COBYLA'} var_form_cfg = {'name': 'RYRZ', 'depth': 5} params = { 'problem': { 'name': 'ising', 'random_seed': 10598 }, 'algorithm': algorithm_cfg, 'optimizer': optimizer_cfg, 'variational_form': var_form_cfg } backend = BasicAer.get_backend('statevector_simulator') result = run_algorithm(params, self.algo_input, backend=backend) x = exactcover.sample_most_likely(len(self.list_of_subsets), result['eigvecs'][0]) ising_sol = exactcover.get_solution(x) oracle = self.brute_force() self.assertEqual( exactcover.check_solution_satisfiability(ising_sol, self.list_of_subsets), oracle)
def test_exactcover_direct(self): algo = ExactEigensolver(self.algo_input.qubit_op, k=1, aux_operators=[]) result = algo.run() x = exactcover.sample_most_likely(len(self.list_of_subsets), result['eigvecs'][0]) ising_sol = exactcover.get_solution(x) np.testing.assert_array_equal(ising_sol, [0, 1, 1, 0]) oracle = self.brute_force() self.assertEqual( exactcover.check_solution_satisfiability(ising_sol, self.list_of_subsets), oracle)
def test_exactcover(self): params = { 'problem': { 'name': 'ising' }, 'algorithm': { 'name': 'ExactEigensolver' } } result = run_algorithm(params, self.algo_input) x = exactcover.sample_most_likely(len(self.list_of_subsets), result['eigvecs'][0]) ising_sol = exactcover.get_solution(x) np.testing.assert_array_equal(ising_sol, [0, 1, 1, 0]) oracle = self.brute_force() self.assertEqual( exactcover.check_solution_satisfiability(ising_sol, self.list_of_subsets), oracle)
def brute_force(self): # brute-force way: try every possible assignment! has_sol = False def bitfield(n, L): result = np.binary_repr(n, L) return [int(digit) for digit in result] # [2:] to chop off the "0b" part L = len(self.list_of_subsets) max = 2**L for i in range(max): cur = bitfield(i, L) cur_v = exactcover.check_solution_satisfiability( cur, self.list_of_subsets) if cur_v: has_sol = True break return has_sol