def run_optimization(self,
initial_control_amplitudes: np.ndarray,
verbose: bool = False):
"""See base class. """
super().prepare_optimization(
initial_optimization_parameters=initial_control_amplitudes)
try:
result = scipy.optimize.basinhopping(
func=self.cost_fktn_wrapper,
x0=initial_control_amplitudes.T.flatten(),
niter=self.termination_conditions["max_iterations"],
T=self.temperature,
stepsize=self.step_size,
take_step=self._take_step,
callback=None,
interval=self.interval,
disp=verbose)
if self.system_simulator.stats is not None:
self.system_simulator.stats.end_t_opt = time.time()
optim_result = optimization_data.OptimizationResult(
final_cost=result.fun,
indices=self.system_simulator.cost_indices,
final_parameters=result.x.reshape(self.pulse_shape[::-1]).T,
num_iter=result.nfev,
termination_reason=result.message,
status=result.status,
optimizer=self,
optim_summary=self.optim_iter_summary,
optimization_stats=self.system_simulator.stats)
except WallTimeExceeded:
if self.system_simulator.stats is not None:
self.system_simulator.stats.end_t_opt = time.time()
optim_result = optimization_data.OptimizationResult(
final_cost=self._min_costs,
indices=self.system_simulator.cost_indices,
final_parameters=self._min_costs_par,
num_iter=self._n_cost_fkt_eval,
termination_reason='Maximum Wall Time Exceeded',
status=5,
optimizer=self,
optim_summary=self.optim_iter_summary,
optimization_stats=self.system_simulator.stats)
return optim_result
def write_state_to_result(self):
""" Writes the current state into an instance of 'OptimizationResult'.
Intended for saving progress when terminating the optimization in an
unexpected way.
Returns
-------
result: optimization_data.OptimizationResult
The current result of the optimization.
"""
if self.system_simulator.stats is not None:
self.system_simulator.stats.end_t_opt = time.time()
if self.use_jacobian_function:
jac_norm = np.linalg.norm(
self.cost_jacobian_wrapper(self._min_costs_par))
else:
jac_norm = 0
optim_result = optimization_data.OptimizationResult(
final_cost=self._min_costs,
indices=self.system_simulator.cost_indices,
final_parameters=self._min_costs_par,
final_grad_norm=jac_norm,
num_iter=self._n_cost_fkt_eval,
termination_reason='Maximum Wall Time Exceeded',
status=5,
optimizer=self,
optim_summary=self.optim_iter_summary,
optimization_stats=self.system_simulator.stats)
return optim_result
def run_optimization(
self,
initial_control_amplitudes: np.array,
verbose: int = 0) -> optimization_data.OptimizationResult:
"""See base class. """
super().prepare_optimization(
initial_optimization_parameters=initial_control_amplitudes)
if self.use_jacobian_function:
jac = super().cost_jacobian_wrapper
else:
jac = '2-point'
try:
result = scipy.optimize.least_squares(
fun=super().cost_fktn_wrapper,
x0=initial_control_amplitudes.T.flatten(),
jac=jac,
bounds=self.bounds,
method=self.method,
ftol=self.termination_conditions["min_cost_gain"],
xtol=self.termination_conditions["min_amplitude_change"],
gtol=self.termination_conditions["min_gradient_norm"],
max_nfev=self.termination_conditions["max_iterations"],
verbose=verbose)
if self.system_simulator.stats is not None:
self.system_simulator.stats.end_t_opt = time.time()
optim_result = optimization_data.OptimizationResult(
final_cost=result.fun,
indices=self.system_simulator.cost_indices,
final_parameters=result.x.reshape(self.pulse_shape[::-1]).T,
final_grad_norm=np.linalg.norm(result.grad),
num_iter=result.nfev,
termination_reason=result.message,
status=result.status,
optimizer=self,
optim_summary=self.optim_iter_summary,
optimization_stats=self.system_simulator.stats)
except WallTimeExceeded:
optim_result = self.write_state_to_result()
return optim_result
def run_optimization(self, initial_control_amplitudes: np.ndarray):
"""See base class. """
self.prepare_optimization(
initial_optimization_parameters=initial_control_amplitudes)
pulse, costs = self.annealer.anneal()
if self.system_simulator.stats is not None:
self.system_simulator.stats.end_t_opt = time.time()
optim_result = optimization_data.OptimizationResult(
final_cost=costs,
indices=self.system_simulator.cost_indices,
final_parameters=pulse,
optimizer=self,
optim_summary=self.optim_iter_summary,
optimization_stats=self.system_simulator.stats)
return optim_result
def run_optimization(
self,
initial_control_amplitudes: np.array,
verbose: bool = False) -> optimization_data.OptimizationResult:
super().prepare_optimization(
initial_optimization_parameters=initial_control_amplitudes)
if self.use_jacobian_function:
jac = self.cost_jacobian_wrapper
else:
jac = None
if self.method == 'L-BFGS-B':
try:
result = scipy.optimize.minimize(
fun=self.cost_fktn_wrapper,
x0=initial_control_amplitudes.T.flatten(),
jac=jac,
bounds=self.bounds,
method=self.method,
options={
'ftol': self.termination_conditions["min_cost_gain"],
'gtol':
self.termination_conditions["min_gradient_norm"],
'maxiter':
self.termination_conditions["max_iterations"],
'disp': verbose
})
optim_result = optimization_data.OptimizationResult(
final_cost=result.fun,
indices=self.system_simulator.cost_indices,
final_parameters=result.x.reshape(
self.pulse_shape[::-1]).T,
final_grad_norm=np.linalg.norm(result.jac),
num_iter=result.nfev,
termination_reason=result.message,
status=result.status,
optimizer=self,
optim_summary=self.optim_iter_summary,
optimization_stats=self.system_simulator.stats)
except WallTimeExceeded:
optim_result = self.write_state_to_result()
elif self.method == 'Nelder-Mead':
try:
result = scipy.optimize.minimize(
fun=self.cost_fktn_wrapper,
x0=initial_control_amplitudes.T.flatten(),
bounds=self.bounds,
method=self.method,
options={
'maxiter':
self.termination_conditions["max_iterations"]
},
)
optim_result = optimization_data.OptimizationResult(
final_cost=result.fun,
indices=self.system_simulator.cost_indices,
final_parameters=result.x.reshape(
self.pulse_shape[::-1]).T,
num_iter=result.nfev,
termination_reason=result.message,
status=result.status,
optimizer=self,
optim_summary=self.optim_iter_summary,
optimization_stats=self.system_simulator.stats)
except WallTimeExceeded:
optim_result = self.write_state_to_result()
else:
try:
result = scipy.optimize.minimize(
fun=self.cost_fktn_wrapper,
x0=initial_control_amplitudes.T.flatten(),
bounds=self.bounds,
method=self.method)
optim_result = optimization_data.OptimizationResult(
final_cost=result.fun,
indices=self.system_simulator.cost_indices,
final_parameters=result.x.reshape(
self.pulse_shape[::-1]).T,
num_iter=result.nfev,
termination_reason=result.message,
status=result.status,
optimizer=self,
optim_summary=self.optim_iter_summary,
optimization_stats=self.system_simulator.stats)
except WallTimeExceeded:
optim_result = self.write_state_to_result()
if self.system_simulator.stats is not None:
self.system_simulator.stats.end_t_opt = time.time()
return optim_result