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Experiment.py
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Experiment.py
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import configparser
import os
import sys
from ast import literal_eval
import docker
import mlflow
from git import Repo
from minio import Minio
from torch.cuda import is_available
from mlops.ProjectFile import ProjectFile
from mlops.utils.logger import logger, LOG_FILE
class Experiment:
def __init__(self, script, config_path, project_path: str = '.',
verbose: bool = True, ignore_git_check: bool = False):
"""
The Experiment class is the interface through which all projects should be run.
:param script: path to script to run
:param config_path: string path to configuration file
:param project_path: string path to project directory
:param verbose: verbosity
"""
self.script = script
self.config = None
self.artifact_path = None
self.experiment_name = None
self.experiment_id = None
self.config_path = config_path
self.project_path = project_path
self.verbose = verbose
if 'pytest' in sys.modules:
logger.warn('DEBUG ONLY - ignoring git checks due to test run detected')
elif ignore_git_check is True:
logger.warn(
'DEBUG ONLY - ignoring git checks, manually disabled. Ensure this run is not for any experiments '
'intended for production use')
else:
self.check_dirty()
self.check_environment_variables()
self.config_setup()
self.use_gpu = self.config.getboolean('system', 'USE_GPU')
self.env_setup()
self.build_project_file()
self.init_experiment()
if self.verbose:
self.print_experiment_info()
def check_dirty(self) -> bool:
"""
Checks whether the git repository at self.project_path has any uncommmited changes (is_dirty) or if it has any
local commits that are ahead of the remote. If either of these conditions are true an exception is raised.
:return:
"""
logger.debug('Comparing to remote git repository')
repo = Repo(self.project_path)
head = repo.head.ref
tracking = head.tracking_branch()
local_commits_ahead_iter = head.commit.iter_items(repo, f'{tracking.path}..{head.path}')
commits_ahead = sum(1 for _ in local_commits_ahead_iter)
if repo.is_dirty():
raise Exception('Repository is dirty. Please commit your changes before running the experiment')
if commits_ahead > 0:
raise Exception('Local repository ahead of remote. Please push changes before running the experiment')
if not repo.is_dirty() and commits_ahead == 0:
return False
else:
raise Exception('Please synchronise local and remote code versions before running the experiment')
@staticmethod
def check_environment_variables():
"""
Checks that the required environment variables defined by required_env_variables are available.
Required variables are currently the login credentials for the minio storage.
:return:
"""
required_env_variables = ['AWS_ACCESS_KEY_ID',
'AWS_SECRET_ACCESS_KEY']
for var in required_env_variables:
if os.getenv(var) is None:
raise Exception('{0} is a required environment variable: set with "export {0}=<value>"'.format(var))
def config_setup(self):
"""
Reads the configuration file and extracts necessary values
:return:
"""
logger.info('reading config file: {0}'.format(self.config_path))
self.config = configparser.ConfigParser()
self.config.read(self.config_path)
self.artifact_path = self.config['server']['ARTIFACT_PATH']
self.experiment_name = self.config['project']['NAME'].lower()
def env_setup(self):
"""
Stores the variables required for running mlflow projects with docker in the environment
:return:
"""
os.environ['MLFLOW_TRACKING_URI'] = self.config['server']['MLFLOW_TRACKING_URI']
os.environ['MLFLOW_S3_ENDPOINT_URL'] = self.config['server']['MLFLOW_S3_ENDPOINT_URL']
def init_experiment(self):
"""
Initialises experiment for tracking with mlflow.
Fetches experiment info from configured mlflow server. If it doesn't exist then one is created.
:return:
"""
# Get experiment from mlflow server
experiment = mlflow.get_experiment_by_name(self.experiment_name)
if experiment is None:
exp_id = mlflow.create_experiment(self.experiment_name, artifact_location=self.artifact_path)
logger.info('Creating experiment: name: {0} *** ID: {1}'.format(self.experiment_name, exp_id))
else:
exp_id = experiment.experiment_id
logger.info('Logging to existing experiment: {0} *** ID: {1}'.format(self.experiment_name, exp_id))
logger.info('Setting tracking URI to: {0} '.format(os.environ['MLFLOW_TRACKING_URI']))
mlflow.set_tracking_uri(os.environ['MLFLOW_TRACKING_URI'])
logger.info('Setting experiment to: {0} '.format(self.experiment_name))
mlflow.set_experiment(self.experiment_name)
self.configure_minio()
self.experiment_id = exp_id
def print_experiment_info(self):
"""
Prints basic experiment info to logger
:return:
"""
experiment = mlflow.get_experiment(self.experiment_id)
logger.info("Name: {}".format(experiment.name))
logger.info("Experiment_id: {}".format(experiment.experiment_id))
logger.info("Artifact Location: {}".format(experiment.artifact_location))
logger.info("Tags: {}".format(experiment.tags))
logger.info("Lifecycle_stage: {}".format(experiment.lifecycle_stage))
def configure_minio(self):
"""
configures the minio artifact storage.
The minio auth credentials are fetched from the environment and used to create a bucket named "mlflow" for
logging mlflow artifacts. If a bucket called mlflow already exists then the existing bucket is used.
:return:
"""
self.uri_formatted = self.config['server']['MLFLOW_S3_ENDPOINT_URL'].replace("http://", "")
self.minio_cred = {'user': os.getenv('AWS_ACCESS_KEY_ID'),
'password': os.getenv('AWS_SECRET_ACCESS_KEY')}
# todo: replace this with either a machine level IAM role or ~/.aws/credentials profile
os.environ['MINIO_ROOT_USER'] = os.getenv('AWS_ACCESS_KEY_ID')
os.environ['MINIO_ROOT_PASSWORD'] = os.getenv('AWS_SECRET_ACCESS_KEY')
client = Minio(self.uri_formatted, self.minio_cred['user'], self.minio_cred['password'], secure=False)
if 'mlflow' not in (bucket.name for bucket in client.list_buckets()):
logger.info('Creating S3 bucket ''mlflow''')
client.make_bucket("mlflow")
def build_experiment_image(self, path: str = None):
"""
Builds the Dockerfile at location path if parameter is supplied, else uses self.project_path (default)
Images are tagged using the project name defined in config. If proxy variables exist in the environment these
are passed to the docker demon as build arguments.
:param path: optional path to Dockerfile (if not in project_path root)
:return:
"""
logger.info('Building experiment image ...')
# Collect proxy settings
build_args = {}
if os.getenv('http_proxy') is not None or os.getenv('https_proxy') is not None:
build_args = {'http_proxy': os.getenv('http_proxy'),
'https_proxy': os.getenv('https_proxy')}
logger.info('Running docker build with: {0}'.format({'path': path if path else self.project_path,
'tag': self.experiment_name,
'buildargs': build_args,
'rm': ''}))
try:
docker_base_url = 'unix://var/run/docker.sock'
cli = docker.APIClient(base_url=docker_base_url)
valid_cli = True
except:
logger.warn(f'Low level Docker SDK not available on non-unix systems, the build will continue but will not output any logs')
valid_cli = False
if valid_cli:
for line in cli.build(path=self.project_path, tag=self.experiment_name, use_config_proxy=True):
block = line.decode('utf-8').splitlines()
block_dict = literal_eval(block[0])
if 'stream' in block_dict.keys():
print(str(block_dict['stream']), end='')
else:
client = docker.from_env()
client.images.build(path=self.project_path,
tag=self.experiment_name,
buildargs=build_args,
rm=True)
logger.info('Built project image: ' + self.experiment_name + ':latest')
def build_project_file(self, path: str = '.'):
"""
Builds MLProject yaml file used by mlflow to define the project. See the mlops.ProjectFile class for more info.
:param path:
:return:
"""
logger.info('Building project file')
projectfile = ProjectFile(self.config, self.config_path, self.script, path=self.project_path)
projectfile.generate_yaml()
def run(self, **kwargs):
"""
Runs the mlflow project that has been defined by the MLproject file output by self.build_project_file
After running the project the logs are stored as an artifact on the mlflow server.
:param kwargs:
:return:
"""
logger.info(f'Starting experiment: {self.experiment_name}')
docker_args_default = {'network': "host",
'ipc': 'host',
'rm': '',
}
# if not self.use_localhost:
if self.use_gpu and not is_available():
logger.warn('requested GPU resource but none available - using CPU')
elif self.use_gpu and is_available():
gpu_params = {'gpus': 'all',
'runtime': 'nvidia'}
logger.info('Adding docker args: {0}'.format(gpu_params))
docker_args_default.update(gpu_params)
# update docker_args_default with values passed by project
if 'docker_args' in kwargs:
docker_args_default.update(kwargs['docker_args'])
kwargs['docker_args'] = docker_args_default
# check image exists and build if not
logger.info('Checking for existing image')
client = docker.from_env()
images = [str(img['RepoTags']) for img in client.api.images()]
if all([(self.experiment_name + ':latest') not in item for item in images]):
logger.info('No existing image found')
self.build_experiment_image(path=self.project_path)
else:
logger.info(f'Found existing project image: {self.experiment_name}:latest')
logger.debug(f'Artifact URI: {mlflow.get_artifact_uri()}')
logger.debug(f'Project URI: {self.project_path}')
mlflow.run(uri=self.project_path,
experiment_id=self.experiment_id,
env_manager='local',
**kwargs)
mlflow.log_artifact(LOG_FILE)