code: def get_live_trials(self):
      return [t for t in self._trials if t.status != "TERMINATED"]
  
imports: import shutil
  import tempfile
  import unittest
  from ray.tune import PlacementGroupFactory
  from ray.tune.execution.tune_controller import TuneController
  from ray.tune.schedulers.trial_scheduler import TrialScheduler
  from ray.tune.experiment import Trial
  from ray.tune.schedulers.resource_changing_scheduler import ResourceChangingScheduler, DistributeResources, DistributeResourcesToTopJob
  from ray.tune.tests.execution.utils import create_execution_test_objects
  from ray.train.tests.util import mock_storage_context
label_desc: Use image node_id 1 for calling the MockTuneController obj's underlying member method code with example usage: obj.get_live_trials() and returns: unknown