def choose_next(self):
"""
sample a random config and give the least iterations
"""
next_config = sample_configuration(self.config_space, excluded_configs=self.bracket[0]['configs'])
next_n_iteration = self.bracket[0]['n_iteration']
next_extra_conf = {}
return next_config, next_n_iteration, next_extra_conf
def choose_next(self):
"""
sample a random config. give iterations according to Hyperband strategy.
"""
next_n_iteration = self.get_next_n_iteration()
bracket_id = self.get_bracket_id(self.brackets, next_n_iteration)
next_config = sample_configuration(self.config_space, excluded_configs=self.brackets[bracket_id][0]['configs'])
next_extra_conf = {}
return next_config, next_n_iteration, next_extra_conf
def choose_next(self):
"""
sample a config according to MFES. give iterations according to Hyperband strategy.
"""
next_config = None
next_n_iteration = self.get_next_n_iteration()
next_rung_id = self.get_rung_id(self.bracket, next_n_iteration)
# Update weight when the inner loop of hyperband is finished
if self.last_n_iteration != next_n_iteration and not self.use_bohb_strategy:
if self.update_enable and self.weight_update_id > self.s_max:
self.update_weight()
self.weight_update_id += 1
self.last_n_iteration = next_n_iteration
# sample config
excluded_configs = self.bracket[next_rung_id]['configs']
if len(self.target_y[self.iterate_r[-1]]) == 0:
next_config = sample_configuration(
self.config_space, excluded_configs=excluded_configs)
else:
# Like BOHB, sample a fixed percentage of random configurations.
self.random_check_idx += 1
if self.random_configuration_chooser.check(self.random_check_idx):
next_config = sample_configuration(
self.config_space, excluded_configs=excluded_configs)
else:
acq_configs = self.get_bo_candidates()
for config in acq_configs:
if config not in self.bracket[next_rung_id]['configs']:
next_config = config
break
if next_config is None:
self.logger.warning(
'Cannot get a non duplicate configuration from bo candidates. '
'Sample a random one.')
next_config = sample_configuration(
self.config_space, excluded_configs=excluded_configs)
next_extra_conf = {}
return next_config, next_n_iteration, next_extra_conf