Source code for c3.optimizers.calibration

"""Object that deals with the closed loop optimal control."""

import os
import time
from typing import List
import hjson
import pickle
import inspect

from c3.c3objs import hjson_decode
from c3.optimizers.optimizer import Optimizer
from c3.libraries.algorithms import algorithms
from c3.utils.utils import log_setup


[docs]class Calibration(Optimizer): """ Object that deals with the closed loop optimal control. Parameters ---------- dir_path : str Filepath to save results eval_func : callable infidelity function to be minimized pmap : ParameterMap Identifiers for the parameter vector algorithm : callable From the algorithm library options : dict Options to be passed to the algorithm run_name : str User specified name for the run, will be used as root folder """ def __init__( self, eval_func, pmap, algorithm, dir_path=None, exp_type=None, exp_right=None, options={}, run_name=None, logger: List = None, ): if type(algorithm) is str: algorithm = algorithms[algorithm] super().__init__(pmap=pmap, algorithm=algorithm, logger=logger) self.set_eval_func(eval_func, exp_type) self.options = options self.exp_right = exp_right self.__dir_path = dir_path self.__run_name = run_name self.run = self.optimize_controls # alias for legacy method
[docs] def set_eval_func(self, eval_func, exp_type): """ Setter for the eval function. Parameters ---------- eval_func : callable Function to be evaluated """ # TODO: Implement shell for experiment communication self.eval_func = eval_func
[docs] def log_setup(self) -> None: """ Create the folders to store data. Parameters ---------- dir_path : str Filepath run_name : str User specified name for the run """ run_name = self.__run_name if run_name is None: run_name = self.eval_func.__name__ + self.algorithm.__name__ self.logdir = log_setup(self.__dir_path, run_name) self.logname = "calibration.log" # We create a copy of the source code of the evaluation function in the log with open(os.path.join(self.logdir, "eval_func.py"), "w") as eval_source: eval_source.write(inspect.getsource(self.eval_func))
[docs] def optimize_controls(self) -> None: """ Apply a search algorithm to your gateset given a fidelity function. """ self.log_setup() self.start_log() self.picklefilename = self.logdir + "dataset.pickle" print(f"C3:STATUS:Saving as: {os.path.abspath(self.logdir + self.logname)}") x_init = self.pmap.get_parameters_scaled() try: self.algorithm( x_init, fun=self.fct_to_min, fun_grad=self.fct_to_min_autograd, grad_lookup=self.lookup_gradient, options=self.options, ) except KeyboardInterrupt: pass with open(os.path.join(self.logdir, "best_point_" + self.logname), "r") as file: best_params = hjson.load(file, object_pairs_hook=hjson_decode)[ "optim_status" ]["params"] self.pmap.set_parameters(best_params) self.end_log() measurements = [] with open(self.picklefilename, "rb") as pickle_file: while True: try: measurements.append(pickle.load(pickle_file)) except EOFError: break learn_from = {} learn_from["seqs_grouped_by_param_set"] = measurements learn_from["opt_map"] = self.pmap.opt_map with open(self.picklefilename, "wb+") as pickle_file: pickle.dump(learn_from, pickle_file)
[docs] def goal_run(self, current_params): """ Evaluate the goal function for current parameters. Parameters ---------- current_params : tf.Tensor Vector representing the current parameter values. Returns ------- tf.float64 Value of the goal function """ self.pmap.set_parameters_scaled(current_params) # There could be more processing happening here, i.e. an exp could # generate signals for an experiment and send those to eval_func. params = self.pmap.get_parameters() goal, results, results_std, seqs, shots = self.eval_func(params) self.optim_status["params"] = [ par.numpy().tolist() for par in self.pmap.get_parameters() ] self.optim_status["goal"] = float(goal) self.optim_status["time"] = time.asctime() self.evaluation += 1 self.log_pickle(params, seqs, results, results_std, shots) return goal
[docs] def log_pickle(self, params, seqs, results, results_std, shots): """ Save a pickled version of the performed experiment, suitable for model learning. Parameters ---------- params : tf.Tensor Vector of parameter values seqs : list Strings identifying the performed instructions results : list Values of the goal function results_std : list Standard deviation of the results, in the case of noisy data shots : list Number of repetitions used in averaging noisy data """ data_entry = { "params": params, "seqs": seqs, "results": results, "results_std": results_std, "shots": shots, } with open(self.picklefilename, "ab") as file: pickle.dump(data_entry, file)