code: def __init__(self, node_id: str = "node1"):
      self.node_id = node_id
  
imports: import collections
  import time
  import pytest
  import ray
  from ray.data._internal.compute import ActorPoolStrategy
  from ray.data._internal.execution.operators.actor_pool_map_operator import AutoscalingConfig, AutoscalingPolicy, _ActorPool
  from ray.data._internal.execution.util import make_ref_bundles
  from ray.tests.conftest import *
label_desc: Use image node_id 1 to create a new PoolWorker object  with example: obj = PoolWorker(node_id)