def _pull_job_info(self):
service_id = self._service_id
logger.info('Reading job info from meta store...')
with self._meta_store:
worker = self._meta_store.get_inference_job_worker(service_id)
if worker is None:
raise InvalidWorkerError(
'No such worker "{}"'.format(service_id))
inference_job = self._meta_store.get_inference_job(
worker.inference_job_id)
if inference_job is None:
raise InvalidWorkerError(
'No such inference job with ID "{}"'.format(
worker.inference_job_id))
trial = self._meta_store.get_trial(worker.trial_id)
if trial is None or trial.store_params_id is None: # Must have model saved
raise InvalidTrialError('No saved trial with ID "{}"'.format(
worker.trial_id))
logger.info(f'Using trial "{trial.id}"...')
model = self._meta_store.get_model(trial.model_id)
if model is None:
raise InvalidTrialError('No such model with ID "{}"'.format(
trial.model_id))
logger.info(f'Using model "{model.name}"...')
self._inference_job_id = inference_job.id
self._py_model_class = load_model_class(model.model_file_bytes,
model.model_class)
self._proposal = Proposal.from_jsonable(trial.proposal)
self._store_params_id = trial.store_params_id
def pull_job_info(self):
service_id = self._service_id
logger.info('Reading job info from meta store...')
with self._meta_store:
worker = self._meta_store.get_train_job_worker(service_id)
if worker is None:
raise InvalidWorkerError('No such worker "{}"'.format(service_id))
sub_train_job = self._meta_store.get_sub_train_job(worker.sub_train_job_id)
if sub_train_job is None:
raise InvalidWorkerError('No such sub train job associated with advisor "{}"'.format(service_id))
train_job = self._meta_store.get_train_job(sub_train_job.train_job_id)
if train_job is None:
raise InvalidWorkerError('No such train job with ID "{}"'.format(sub_train_job.train_job_id))
model = self._meta_store.get_model(sub_train_job.model_id)
if model is None:
raise InvalidWorkerError('No such model with ID "{}"'.format(sub_train_job.model_id))
logger.info(f'Using model "{model.name}"...')
(self.train_dataset_path, self.val_dataset_path) = self._load_datasets(train_job)
self.train_args = train_job.train_args
self.sub_train_job_id = sub_train_job.id
self.model_class = load_model_class(model.model_file_bytes, model.model_class)
def pull_job_info(self):
service_id = self._service_id
logger.info('Reading job info from meta store...')
with self._meta_store:
sub_train_job = self._meta_store.get_sub_train_job_by_advisor(service_id)
if sub_train_job is None:
raise InvalidSubTrainJobError('No sub train job associated with advisor "{}"'.format(service_id))
train_job = self._meta_store.get_train_job(sub_train_job.train_job_id)
if train_job is None:
raise InvalidSubTrainJobError('No such train job with ID "{}"'.format(sub_train_job.train_job_id))
model = self._meta_store.get_model(sub_train_job.model_id)
if model is None:
raise InvalidSubTrainJobError('No such model with ID "{}"'.format(sub_train_job.model_id))
logger.info(f'Using model "{model.name}"...')
logger.info(f'Using budget "{train_job.budget}"...')
trials = self._meta_store.get_trials_of_sub_train_job(sub_train_job.id)
self.sub_train_job_id = sub_train_job.id
self.budget = train_job.budget
self.model_class = load_model_class(model.model_file_bytes, model.model_class)
self._num_trials = len(trials)
self._model_id = model.id
def _load_model(self, trial_id):
trial = self._db.get_trial(trial_id)
model = self._db.get_model(trial.model_id)
# Load model based on trial
clazz = load_model_class(model.model_file_bytes, model.model_class)
model_inst = clazz()
model_inst.init(trial.knobs)
# Unpickle model parameters and load it
parameters = pickle.loads(trial.parameters)
model_inst.load_parameters(parameters)
return model_inst
def _load_model(self, trial_id):
trial = self._db.get_trial(trial_id)
sub_train_job = self._db.get_sub_train_job(trial.sub_train_job_id)
model = self._db.get_model(sub_train_job.model_id)
# Load model based on trial
clazz = load_model_class(model.model_file_bytes, model.model_class)
model_inst = clazz(**trial.knobs)
# Unpickle model parameters and load it
with open(trial.params_file_path, 'rb') as f:
parameters = f.read()
parameters = pickle.loads(parameters)
model_inst.load_parameters(parameters)
return model_inst
def start(self):
logger.info('Starting train worker for service of ID "{}"...' \
.format(self._service_id))
# TODO: Break up crazily long & unreadable method
advisor_id = None
while True:
with self._db:
(sub_train_job_id, budget, model_id, model_file_bytes, model_class, \
train_job_id, train_dataset_uri, test_dataset_uri) = self._read_worker_info()
if self._if_budget_reached(budget, sub_train_job_id):
# If budget reached
logger.info('Budget for train job has reached')
self._stop_worker()
if advisor_id is not None:
self._delete_advisor(advisor_id)
break
# Create a new trial
logger.info('Creating new trial in DB...')
trial = self._db.create_trial(
sub_train_job_id=sub_train_job_id, model_id=model_id)
self._db.commit()
self._trial_id = trial.id
logger.info('Created trial of ID "{}" in DB'.format(
self._trial_id))
# Don't keep DB connection while training model
# Perform trial & record results
score = 0
try:
logger.info('Starting trial...')
# Load model class from bytes
logger.info('Loading model class...')
clazz = load_model_class(model_file_bytes, model_class)
# If not created, create a Rafiki advisor for train worker to propose knobs in trials
if advisor_id is None:
logger.info('Creating Rafiki advisor...')
advisor_id = self._create_advisor(clazz)
logger.info(
'Created advisor of ID "{}"'.format(advisor_id))
# Generate knobs for trial
logger.info('Requesting for knobs proposal from advisor...')
knobs = self._get_proposal_from_advisor(advisor_id)
logger.info('Received proposal of knobs from advisor:')
logger.info(pprint.pformat(knobs))
# Mark trial as running in DB
logger.info('Training & evaluating model...')
with self._db:
trial = self._db.get_trial(self._trial_id)
self._db.mark_trial_as_running(trial, knobs)
def handle_log(log_line, log_lvl):
with self._db:
trial = self._db.get_trial(self._trial_id)
self._db.add_trial_log(trial, log_line, log_lvl)
(score, parameters) = self._train_and_evaluate_model(
clazz, knobs, train_dataset_uri, test_dataset_uri,
handle_log)
logger.info('Trial score: {}'.format(score))
with self._db:
logger.info('Marking trial as complete in DB...')
trial = self._db.get_trial(self._trial_id)
self._db.mark_trial_as_complete(trial, score, parameters)
self._trial_id = None
# Report results of trial to advisor
try:
logger.info(
'Sending result of trials\' knobs to advisor...')
self._feedback_to_advisor(advisor_id, knobs, score)
except Exception:
logger.error(
'Error while sending result of proposal to advisor:')
logger.error(traceback.format_exc())
except Exception:
logger.error('Error while running trial:')
logger.error(traceback.format_exc())
logger.info('Marking trial as errored in DB...')
with self._db:
trial = self._db.get_trial(self._trial_id)
self._db.mark_trial_as_errored(trial)
self._trial_id = None
break # Exit worker upon trial error
def start(self):
logger.info('Starting train worker for service of ID "{}"...' \
.format(self._service_id))
advisor_id = None
while True:
self._db.connect()
(budget, model_id, model_file_bytes, model_class, train_job_id,
train_dataset_uri, test_dataset_uri) = self._read_worker_info()
if self._if_budget_reached(budget, train_job_id, model_id):
# If budget reached
logger.info('Budget for train job has reached')
self._stop_worker()
if advisor_id is not None:
self._delete_advisor(advisor_id)
break
# Load model class from bytes
try:
clazz = load_model_class(model_file_bytes, model_class)
except Exception as e:
logger.error('Error while loading model class for worker:')
logger.error(traceback.format_exc())
self._stop_worker()
raise e
# If not created, create a Rafiki advisor for train worker to propose knobs in trials
if advisor_id is None:
logger.info('Creating Rafiki advisor...')
try:
advisor_id = self._create_advisor(clazz)
logger.info(
'Created advisor of ID "{}"'.format(advisor_id))
except Exception as e:
logger.error('Error while creating advisor for worker:')
logger.error(traceback.format_exc())
raise e
# Create a new trial
logger.info('Starting trial...')
logger.info('Requesting for knobs proposal from advisor...')
knobs = self._get_proposal_from_advisor(advisor_id)
logger.info('Received proposal of knobs from advisor:')
logger.info(pprint.pformat(knobs))
logger.info('Creating new trial in DB...')
trial = self._create_new_trial(model_id, train_job_id, knobs)
self._trial_id = trial.id
logger.info('Created trial of ID "{}" in DB'.format(trial.id))
# Don't keep DB connection while training model
self._db.disconnect()
# Perform trial & record results
score = 0
try:
logger.info('Starting trial...')
logger.info('Training & evaluating model...')
(score, parameters, logs) = self._train_and_evaluate_model(
clazz, knobs, train_dataset_uri, test_dataset_uri)
logger.info('Trial score: {}'.format(score))
with self._db:
logger.info('Marking trial as complete in DB...')
trial = self._db.get_trial(self._trial_id)
self._db.mark_trial_as_complete(trial, score, parameters,
logs)
self._trial_id = None
except Exception:
logger.error('Error while running trial:')
logger.error(traceback.format_exc())
logger.info('Marking trial as errored in DB...')
with self._db:
trial = self._db.get_trial(self._trial_id)
self._db.mark_trial_as_errored(trial)
self._trial_id = None
# Report results of trial to advisor
try:
logger.info('Sending result of trials\' knobs to advisor...')
self._feedback_to_advisor(advisor_id, knobs, score)
except Exception:
logger.error(
'Error while sending result of proposal to advisor:')
logger.error(traceback.format_exc())
