def construct_mixer(self): self.mixer = n_qbit_mixer(self.initial_state)
def main(args=None): """[summary] Args: raw_args ([type], optional): [description]. Defaults to None. """ start = time() if args == None: args = parse() prob_s_s = [] qubo_no = args["no_samples"] print("__" * 50, "\nQUBO NO: {}\n".format(qubo_no), "__" * 50) #Load generated qubo_no with open( 'qubos_{}_car_{}_routes/qubo_{}.pkl'.format( args["no_cars"], args["no_routes"], qubo_no), 'rb') as f: qubo, max_coeff, operator, offset, routes = pkl.load(f) print(operator) x_s = find_all_ground_states(qubo) # Visualise if args["visual"]: graph = import_map('melbourne.pkl') visualise_solution(graph, routes) # Solve QAOA from QUBO with valid solution no_couplings = count_coupling_terms(operator) print("Number of couplings: {}".format(no_couplings)) print("Solving with QAOA...") no_shots = 10000 backend = Aer.get_backend('statevector_simulator') quantum_instance = QuantumInstance(backend, shots=no_shots) optimizer_method = "LN_SBPLX" optimizer = NLOPT_Optimizer(method=optimizer_method) print("_" * 50, "\n" + optimizer.__class__.__name__) print("_" * 50) quantum_instance = QuantumInstance(backend) prob_s_s = [] initial_state = construct_initial_state(args["no_routes"], args["no_cars"]) mixer = n_qbit_mixer(initial_state) next_fourier_point, next_fourier_point_B = [0, 0], [ 0, 0 ] #Not used for p=1 then gets updated for p>1. for p in range(1, args["p_max"] + 1): print("p = {}".format(p)) if p == 1: points = [[0.75,0]] \ # + [[ np.pi*(2*np.random.rand() - 1) for _ in range(2) ] for _ in range(args["no_restarts"])] draw_circuit = True else: penalty = 0.6 points = generate_points(next_fourier_point, no_perturb=10, penalty=0.6) print(points) \ # + generate_points(next_fourier_point_B, 10, penalty) draw_circuit = False #empty lists to save following results to choose best result results = [] exp_vals = [] for r in range(len(points)): point = points[r] if np.amax(np.abs(point)) < np.pi / 2: qaoa_results, optimal_circ = CustomQAOA( operator, quantum_instance, optimizer, reps=p, initial_fourier_point=points[r], initial_state=initial_state, mixer=mixer, construct_circ=draw_circuit) if r == 0: next_fourier_point = np.array(qaoa_results.optimal_point) next_fourier_point = QAOAEx.convert_from_fourier_point( next_fourier_point, 2 * p + 2) next_fourier_point = QAOAEx.convert_to_fourier_point( next_fourier_point, 2 * p + 2) exp_val = qaoa_results.eigenvalue * max_coeff + offset exp_vals.append(exp_val) prob_s = 0 for string in x_s: prob_s += qaoa_results.eigenstate[ string] if string in qaoa_results.eigenstate else 0 results.append((qaoa_results, optimal_circ, prob_s)) print("Point_no: {}, Exp_val: {}, Prob_s: {}".format( r, exp_val, prob_s)) else: print( "Point_no: {}, was skipped because it is outside of bounds" .format(r)) minim_index = np.argmin(exp_vals) optimal_qaoa_result, optimal_circ, optimal_prob_s = results[ minim_index] # if draw_circuit: # print(optimal_circ.draw()) minim_exp_val = exp_vals[minim_index] print("Minimum: {}, prob_s: {}".format(minim_exp_val, optimal_prob_s)) prob_s_s.append(optimal_prob_s) next_fourier_point_B = np.array(optimal_qaoa_result.optimal_point) print("Optimal_point: {}".format(next_fourier_point_B)) next_fourier_point_B = QAOAEx.convert_from_fourier_point( next_fourier_point_B, 2 * p + 2) next_fourier_point_B = QAOAEx.convert_to_fourier_point( next_fourier_point_B, 2 * p + 2) print(prob_s_s) with open( 'results/{}cars{}routes_qubo{}.csv'.format(args["no_cars"], args["no_routes"], args["no_samples"]), 'w') as f: np.savetxt(f, prob_s_s, delimiter=',') finish = time() print("Time Taken: {}".format(finish - start))
def main(args=None): """[summary] Args: raw_args ([type], optional): [description]. Defaults to None. """ start = time() if args == None: args = parse() qubo_no = args["no_samples"] print_to_file("-" * 50) print_to_file("QUBO_{}".format(qubo_no)) #Load generated qubo_no with open( 'qubos_{}_car_{}_routes/qubo_{}.pkl'.format( args["no_cars"], args["no_routes"], qubo_no), 'rb') as f: qubo, max_coeff, operator, offset, routes = pkl.load(f) qubo = QuadraticProgram() qubo.from_ising(operator) x_s, opt_value, classical_result = find_all_ground_states(qubo) print_to_file(classical_result) #Set optimizer method method = args["method"] optimizer = NLOPT_Optimizer(method=method, result_message=False) # optimizer = COBYLA() backend = Aer.get_backend("statevector_simulator") quantum_instance = QuantumInstance(backend=backend) approx_ratios = [] prob_s_s = [] p_max = args["p_max"] no_routes, no_cars = (args["no_routes"], args["no_cars"]) custom = True if custom: initial_state = construct_initial_state(no_routes=no_routes, no_cars=no_cars) mixer = n_qbit_mixer(initial_state) else: initial_state, mixer = (None, None) fourier_parametrise = args["fourier"] print_to_file("-" * 50) print_to_file( "Now solving with TQA_QAOA... Fourier Parametrisation: {}".format( fourier_parametrise)) # maxeval = 125 for p in range(1, p_max + 1): construct_circ = False deltas = np.arange(0.45, 0.91, 0.05) point = np.append([(i + 1) / p for i in range(p)], [1 - (i + 1) / p for i in range(p)]) points = [delta * point for delta in deltas] print_to_file("-" * 50) print_to_file(" " + "p={}".format(p)) if fourier_parametrise: points = [ convert_to_fourier_point(point, len(point)) for point in points ] # maxeval *= 2 #Double max_allowed evals for optimizer # optimizer.set_options(maxeval = maxeval) optimizer.set_options(maxeval=1000 * p) qaoa_results, optimal_circ = CustomQAOA( operator, quantum_instance, optimizer, reps=p, initial_state=initial_state, mixer=mixer, construct_circ=construct_circ, fourier_parametrise=fourier_parametrise, list_points=points, qubo=qubo) exp_val = qaoa_results.eigenvalue * max_coeff state_solutions = { item[0][::-1]: item[1:] for item in qaoa_results.eigenstate } for item in sorted(state_solutions.items(), key=lambda x: x[1][1], reverse=True)[0:5]: print_to_file(item) prob_s = 0 for string in x_s: prob_s += state_solutions[string][ 1] if string in state_solutions else 0 prob_s /= len(x_s) #normalise optimal_point = qaoa_results.optimal_point if fourier_parametrise: optimal_point = convert_from_fourier_point(optimal_point, len(optimal_point)) approx_ratio = 1 - np.abs((opt_value - exp_val) / opt_value) nfev = qaoa_results.cost_function_evals print_to_file( " " + "Optimal_point: {}, Nfev: {}".format(optimal_point, nfev)) print_to_file(" " + "Exp_val: {}, Prob_s: {}, approx_ratio: {}".format( exp_val, prob_s, approx_ratio)) approx_ratios.append(approx_ratio) prob_s_s.append(prob_s) print_to_file("-" * 50) print_to_file("QAOA terminated") print_to_file("-" * 50) print_to_file("Approximation ratios per layer: {}".format(approx_ratios)) print_to_file("Prob_success per layer: {}".format(prob_s_s)) save_results = np.append(approx_ratios, prob_s_s) if fourier_parametrise: with open( 'results_{}cars{}routes/TQA_F_{}.csv'.format( args["no_cars"], args["no_routes"], args["no_samples"]), 'w') as f: np.savetxt(f, save_results, delimiter=',') print_to_file( "Results saved in results_{}cars{}routes/TQA_F_{}.csv".format( args["no_cars"], args["no_routes"], args["no_samples"])) else: with open( 'results_{}cars{}routes/TQA_NF_{}.csv'.format( args["no_cars"], args["no_routes"], args["no_samples"]), 'w') as f: np.savetxt(f, save_results, delimiter=',') print_to_file( "Results saved in results_{}cars{}routes/TQA_NF_{}.csv".format( args["no_cars"], args["no_routes"], args["no_samples"])) finish = time() print_to_file("Time Taken: {}".format(finish - start))
def main(args = None): """[summary] Args: raw_args ([type], optional): [description]. Defaults to None. """ start = time() if args == None: args = parse() qubo_no = args["no_samples"] print_to_file("-"*50) print_to_file("QUBO_{}".format(qubo_no)) #Load generated qubo_no with open('qubos_{}_car_{}_routes/qubo_{}.pkl'.format(args["no_cars"], args["no_routes"], qubo_no), 'rb') as f: qubo, max_coeff, operator, offset, routes = pkl.load(f) qubo = QuadraticProgram() qubo.from_ising(operator) x_s, opt_value, classical_result = find_all_ground_states(qubo) print_to_file(classical_result) #Set optimizer method method = args["method"] optimizer = NLOPT_Optimizer(method = method, result_message=False) backend = Aer.get_backend("statevector_simulator") quantum_instance = QuantumInstance(backend = backend) approx_ratios = [] prob_s_s = [] p_max = args["p_max"] no_routes, no_cars = (args["no_routes"], args["no_cars"]) custom = True if custom: initial_state = construct_initial_state(no_routes = no_routes, no_cars = no_cars) mixer = n_qbit_mixer(initial_state) else: initial_state, mixer = (None, None) fourier_parametrise = args["fourier"] print_to_file("-"*50) print_to_file("Now solving with QAOA... Fourier Parametrisation: {}".format(fourier_parametrise)) for p in range(1, p_max+1): if p == 1: points = [[0,0]] + [ np.random.uniform(low = -np.pi/2+0.01, high = np.pi/2-0.01, size = 2*p) for _ in range(2**p)] next_point = [] else: penalty = 0.6 points = [next_point_l] + generate_points(next_point, no_perturb=min(2**p-1,10), penalty=penalty) construct_circ = False #empty lists to save following results to choose best result results = [] exp_vals = [] print_to_file("-"*50) print_to_file(" "+"p={}".format(p)) optimizer.set_options(maxeval = 1000*p) for r, point in enumerate(points): qaoa_results, optimal_circ = CustomQAOA(operator, quantum_instance, optimizer, reps = p, initial_fourier_point= point, initial_state = initial_state, mixer = mixer, construct_circ= construct_circ, fourier_parametrise = fourier_parametrise, qubo = qubo ) if r == 0: if fourier_parametrise: next_point_l = np.zeros(shape = 2*p + 2) next_point_l[0:p] = qaoa_results.optimal_point[0:p] next_point_l[p+1:2*p+1] = qaoa_results.optimal_point[p:2*p] else: next_point_l = interp_point(qaoa_results.optimal_point) exp_val = qaoa_results.eigenvalue * max_coeff exp_vals.append(exp_val) state_solutions = { item[0][::-1]: item[1:] for item in qaoa_results.eigenstate } for item in sorted(state_solutions.items(), key = lambda x: x[1][1], reverse = True)[0:5]: print_to_file( item ) prob_s = 0 for string in x_s: prob_s += state_solutions[string][1] if string in state_solutions else 0 prob_s /= len(x_s) #normalise results.append((qaoa_results, optimal_circ, prob_s)) print_to_file(" "+"Point_{}, Exp_val: {}, Prob_s: {}".format(r, exp_val, prob_s)) minim_index = np.argmin(exp_vals) optimal_qaoa_result, optimal_circ, optimal_prob_s = results[minim_index] if fourier_parametrise: next_point = convert_from_fourier_point( optimal_qaoa_result.optimal_point, 2*p ) next_point = convert_to_fourier_point( interp_point(next_point), 2*p + 2 ) # next_point = np.zeros(shape = 2*p + 2) # next_point[0:p] = optimal_qaoa_result.optimal_point[0:p] # next_point[p+1:2*p+1] = optimal_qaoa_result.optimal_point[p:2*p] else: next_point = interp_point(optimal_qaoa_result.optimal_point) if construct_circ: print_to_file(optimal_circ.draw(fold=150)) minim_exp_val = exp_vals[minim_index] approx_ratio = 1.0 - np.abs( (opt_value - minim_exp_val ) / opt_value ) print_to_file(" "+"Minimum: {}, prob_s: {}, approx_ratio {}".format(minim_exp_val, optimal_prob_s, approx_ratio)) approx_ratios.append(approx_ratio) prob_s_s.append(optimal_prob_s) print_to_file("-"*50) print_to_file("QAOA terminated") print_to_file("-"*50) print_to_file("Approximation ratios per layer: {}".format(approx_ratios)) print_to_file("Prob_success per layer: {}".format(prob_s_s)) save_results = np.append(approx_ratios, prob_s_s) if fourier_parametrise: with open('results_{}cars{}routes/RI_F_{}.csv'.format(args["no_cars"], args["no_routes"], args["no_samples"]), 'w') as f: np.savetxt(f, save_results, delimiter=',') print_to_file("Results saved in results_{}cars{}routes/RI_F_{}.csv".format(args["no_cars"], args["no_routes"], args["no_samples"])) else: with open('results_{}cars{}routes/RI_NF_{}.csv'.format(args["no_cars"], args["no_routes"], args["no_samples"]), 'w') as f: np.savetxt(f, save_results, delimiter=',') print_to_file("Results saved in results_{}cars{}routes/RI_NF_{}.csv".format(args["no_cars"], args["no_routes"], args["no_samples"])) finish = time() print_to_file("Time Taken: {}".format(finish - start))