def set_experiment_tag(self, experiment_id, tag):
"""
Set a tag for the specified experiment
:param experiment_id: String ID of the experiment
:param tag: ExperimentRunTag instance to log
"""
_validate_experiment_tag(tag.key, tag.value)
with self.ManagedSessionMaker() as session:
experiment = self._get_experiment(session, experiment_id,
ViewType.ALL).to_mlflow_entity()
self._check_experiment_is_active(experiment)
session.merge(
SqlExperimentTag(experiment_id=experiment_id,
key=tag.key,
value=tag.value))