# -*- coding: utf-8 -*-
"""
Evaluate objective on a set of parameters
=========================================
Call user's script as a black box process to evaluate a trial.
"""
import copy
import logging
import os
import signal
import subprocess
import tempfile
import orion.core
from orion.core.io.orion_cmdline_parser import OrionCmdlineParser
from orion.core.io.resolve_config import infer_versioning_metadata
from orion.core.utils.exceptions import BranchingEvent, InexecutableUserScript
from orion.core.utils.working_dir import WorkingDir
from orion.core.worker.trial_pacemaker import TrialPacemaker
log = logging.getLogger(__name__)
# pylint: disable = unused-argument
def _handler(signum, frame):
log.error("Oríon has been interrupted.")
raise KeyboardInterrupt
[docs]class ExecutionError(Exception):
"""Error raised when Orion is unable to execute the user's script without errors."""
pass
[docs]class Consumer(object):
"""Consume a trial by using it to initialize a black-box box to evaluate it.
It uses an `Experiment` object to push an evaluated trial, if results are
delivered to the worker process successfully.
It forks another process which executes user's script with the suggested
options. It expects results to be written in a **JSON** file, whose path
has been defined in a special orion environmental variable which is set
into the child process' environment.
Parameters
----------
experiment: `orion.core.worker.experiment.Experiment`
Manager of this experiment, provides convenient interface for interacting with
the database.
heartbeat: int, optional
Frequency (seconds) at which the heartbeat of the trial is updated.
If the heartbeat of a `reserved` trial is larger than twice the configured
heartbeat, Oríon will reset the status of the trial to `interrupted`.
This allows restoring lost trials (ex: due to killed worker).
Defaults to ``orion.core.config.worker.heartbeat``.
user_script_config: str, optional
Config argument name of user's script (--config).
Defaults to ``orion.core.config.worker.user_script_config``.
interrupt_signal_code: int, optional
Signal returned by user script to signal to Oríon that it was interrupted.
Defaults to ``orion.core.config.worker.interrupt_signal_code``.
"""
def __init__(
self,
experiment,
heartbeat=None,
user_script_config=None,
interrupt_signal_code=None,
ignore_code_changes=None,
):
log.debug("Creating Consumer object.")
self.experiment = experiment
self.space = experiment.space
if self.space is None:
raise RuntimeError(
"Experiment object provided to Consumer has not yet completed"
" initialization."
)
if heartbeat is None:
heartbeat = orion.core.config.worker.heartbeat
if user_script_config is None:
user_script_config = orion.core.config.worker.user_script_config
if interrupt_signal_code is None:
interrupt_signal_code = orion.core.config.worker.interrupt_signal_code
if ignore_code_changes is None:
ignore_code_changes = orion.core.config.evc.ignore_code_changes
self.heartbeat = heartbeat
self.interrupt_signal_code = interrupt_signal_code
self.ignore_code_changes = ignore_code_changes
# Fetch space builder
self.template_builder = OrionCmdlineParser(user_script_config)
self.template_builder.set_state_dict(experiment.metadata["parser"])
# Get path to user's script and infer trial configuration directory
if experiment.working_dir:
self.working_dir = os.path.abspath(experiment.working_dir)
else:
self.working_dir = os.path.join(tempfile.gettempdir(), "orion")
self.pacemaker = None
[docs] def consume(self, trial):
"""Execute user's script as a block box using the options contained
within `trial`.
Parameters
----------
trial: `orion.core.worker.trial.Trial`
Orion trial to execute.
Returns
-------
bool
True if the trial was successfully executed. False if the trial is broken.
"""
log.debug("### Create new directory at '%s':", self.working_dir)
temp_dir = not bool(self.experiment.working_dir)
prefix = self.experiment.name + "_"
suffix = trial.id
try:
with WorkingDir(
self.working_dir, temp_dir, prefix=prefix, suffix=suffix
) as workdirname:
log.debug("## New consumer context: %s", workdirname)
trial.working_dir = workdirname
results_file = self._consume(trial, workdirname)
log.debug(
"## Parse results from file and fill corresponding Trial object."
)
self.experiment.update_completed_trial(trial, results_file)
success = True
except KeyboardInterrupt:
log.debug("### Save %s as interrupted.", trial)
self.experiment.set_trial_status(trial, status="interrupted")
raise
except ExecutionError:
log.debug("### Save %s as broken.", trial)
self.experiment.set_trial_status(trial, status="broken")
success = False
return success
[docs] def get_execution_environment(self, trial, results_file="results.log"):
"""Set a few environment variables to allow users and
underlying processes to know if they are running under orion.
Parameters
----------
results_file: str
file used to store results, this is only used by the legacy protocol
trial: Trial
reference to the trial object that is going to be run
Notes
-----
This function defines the environment variables described below
.. envvar:: ORION_EXPERIMENT_ID
:noindex:
Current experiment that is being ran.
.. envvar:: ORION_EXPERIMENT_NAME
:noindex:
Name of the experiment the worker is currently working on.
.. envvar:: ORION_EXPERIMENT_VERSION
:noindex:
Version of the experiment the worker is currently working on.
.. envvar:: ORION_TRIAL_ID
:noindex:
Current trial id that is currently being executed in this process.
.. envvar:: ORION_WORKING_DIRECTORY
:noindex:
Trial's current working directory.
.. envvar:: ORION_RESULTS_PATH
:noindex:
Trial's results file that is read by the legacy protocol to get the results of the trial
after a successful run.
"""
env = dict(os.environ)
env["ORION_EXPERIMENT_ID"] = str(self.experiment.id)
env["ORION_EXPERIMENT_NAME"] = str(self.experiment.name)
env["ORION_EXPERIMENT_VERSION"] = str(self.experiment.version)
env["ORION_TRIAL_ID"] = str(trial.id)
env["ORION_WORKING_DIR"] = str(trial.working_dir)
env["ORION_RESULTS_PATH"] = str(results_file)
env["ORION_INTERRUPT_CODE"] = str(self.interrupt_signal_code)
return env
def _consume(self, trial, workdirname):
config_file = tempfile.NamedTemporaryFile(
mode="w", prefix="trial_", suffix=".conf", dir=workdirname, delete=False
)
config_file.close()
log.debug("## New temp config file: %s", config_file.name)
results_file = tempfile.NamedTemporaryFile(
mode="w", prefix="results_", suffix=".log", dir=workdirname, delete=False
)
results_file.close()
log.debug("## New temp results file: %s", results_file.name)
log.debug("## Building command line argument and configuration for trial.")
env = self.get_execution_environment(trial, results_file.name)
cmd_args = self.template_builder.format(
config_file.name, trial, self.experiment
)
log.debug("## Launch user's script as a subprocess and wait for finish.")
self._validate_code_version()
self.pacemaker = TrialPacemaker(trial, self.heartbeat)
self.pacemaker.start()
try:
self.execute_process(cmd_args, env)
finally:
# merciless
self.pacemaker.stop()
return results_file
def _validate_code_version(self):
if self.ignore_code_changes:
return
old_config = self.experiment.configuration
new_config = copy.deepcopy(old_config)
new_config["metadata"]["VCS"] = infer_versioning_metadata(
old_config["metadata"]["user_script"]
)
# Circular import
from orion.core.evc.conflicts import CodeConflict
conflicts = list(CodeConflict.detect(old_config, new_config))
if conflicts:
raise BranchingEvent(
f"Code changed between execution of 2 trials:\n{conflicts[0]}"
)
# pylint: disable = no-self-use
[docs] def execute_process(self, cmd_args, environ):
"""Facilitate launching a black-box trial."""
command = cmd_args
signal.signal(signal.SIGTERM, _handler)
try:
process = subprocess.Popen(command, env=environ)
except PermissionError:
log.debug("### Script is not executable")
raise InexecutableUserScript(" ".join(cmd_args))
return_code = process.wait()
if return_code == self.interrupt_signal_code:
raise KeyboardInterrupt()
elif return_code != 0:
raise ExecutionError(
"Something went wrong. Check logs. Process "
"returned with code {} !".format(return_code)
)