code: def testPlacementGroupLimitedRequestsWithActorReuse(self):
      os.environ["TUNE_MAX_PENDING_TRIALS_PG"] = "6"
      self.testPlacementGroupRequests(reuse_actors=True, scheduled=6)
  
imports: import sys
  import os
  import time
  import numpy
  import unittest
  import ray
  from ray import tune
  from ray.tune.execution.ray_trial_executor import RayTrialExecutor
  from ray.tune.experiment import Trial
  from ray.tune import Callback
  from ray.tune.execution.trial_runner import TrialRunner
  from ray.tune.execution.placement_groups import PlacementGroupFactory
  from ray.util import placement_group_table
  from ray.cluster_utils import Cluster
  from ray.rllib import _register_all
label_desc: Use image node_id 7 for calling the TrialRunnerPlacementGroupTest obj's underlying member method code with example usage: obj.testPlacementGroupLimitedRequestsWithActorReuse() without return types