def _init_objective(batch):
negate, colspec = _objective_colspec(batch)
try:
cols = query.parse_colspec(colspec).cols
except query.ParseError as e:
raise batch_util.BatchError("cannot parse objective %r: %s" % (colspec, e))
else:
if len(cols) > 1:
raise batch_util.BatchError(
"invalid objective %r: only one column may " "be specified" % colspec
)
return negate, cols[0]
def _function_dim(func_name, args, flag_name):
if func_name is None:
func_name = "uniform"
if func_name == "uniform":
return _uniform_dim(args, func_name, flag_name)
elif func_name == "loguniform":
return _real_dim(args, "log-uniform", func_name, flag_name)
raise batch_util.BatchError("unsupported function %r for flag %s" %
(func_name, flag_name))
def _uniform_dim(args, func_name, flag_name):
from skopt.space import space
if len(args) == 2:
dim_args = args
initial = None
elif len(args) == 3:
dim_args = args[:2]
initial = args[2]
else:
raise batch_util.BatchError(
"%s requires 2 or 3 args, got %r for flag %s" %
(func_name, args, flag_name))
return space.check_dimension(dim_args), initial
def previous_trials(self, trial_run_id):
other_trial_runs = _prev_trial_candidates(self.batch, trial_run_id)
if not other_trial_runs:
return []
trials = []
self.run_index.refresh(other_trial_runs, ["scalar"])
for run in other_trial_runs:
loss = self._run_loss(run)
if loss is None:
raise batch_util.BatchError(
"could not get %r for run %s - quitting" % (self.loss_desc, run.id)
)
_try_append_prev_trial(run, self.dim_names, loss, trials)
return trials
def _objective_colspec(batch):
objective = batch.proto_run.get("objective")
if not objective:
return 1, "loss"
elif isinstance(objective, six.string_types):
return 1, objective
elif isinstance(objective, dict):
minimize = objective.get("minimize")
if minimize:
return 1, minimize
maximize = objective.get("maximize")
if maximize:
return -1, maximize
raise batch_util.BatchError("unsupported objective type %r" % objective)
def _real_dim(args, prior, func_name, flag_name):
from skopt.space import space
if len(args) == 2:
dim_args = args
initial = None
elif len(args) == 3:
dim_args = args[:2]
initial = args[2]
else:
raise batch_util.BatchError(
"%s requires 2 or 3 args, got %r for flag %s" %
(func_name, args, flag_name))
real_init_args = list(dim_args) + [prior]
return space.Real(*real_init_args), initial