code: def f(self):
      pass
  
file_path: ray/python/ray/tests/test_autoscaler_fake_scaledown.py
imports: import platform
  import re
  import numpy
  import pytest
  import ray
  from ray._private.test_utils import wait_for_condition
  from ray.cluster_utils import AutoscalingCluster
label_desc: Use image node_id 2 for calling the Actor obj's underlying member method code with example usage: obj.f() without return types