code: def setUp(self):
      os.environ["TUNE_GLOBAL_CHECKPOINT_S"] = "10000"
      os.environ["TUNE_MAX_PENDING_TRIALS_PG"] = "auto"  # Reset default
      self.head_cpus = 8
      self.head_gpus = 4
      self.head_custom = 16
  
      self.cluster = Cluster(
          initialize_head=True,
          connect=True,
          head_node_args={
              "include_dashboard": False,
              "num_cpus": self.head_cpus,
              "num_gpus": self.head_gpus,
              "resources": {"custom": self.head_custom},
              "_system_config": {
                  "health_check_initial_delay_ms": 0,
                  "health_check_period_ms": 1000,
                  "health_check_failure_threshold": 10,
              },
          },
      )
      # Pytest doesn't play nicely with imports
      _register_all()
  
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 1 for calling the TrialRunnerPlacementGroupTest obj's underlying member method code with example usage: obj.setUp() without return types