code: def main():
      """Removes CPU request, removes GPU actor.
      Waits for autoscaler scale-down events to get emitted to stdout.
  
      The worker idle timeout is set to 10 seconds and the autoscaler's update interval is
      5 seconds, so it should be enough to wait 15 seconds.
      An extra ten seconds are added to the timeout as a generous buffer against
      flakiness.
      """
      # Remove resource demands
      ray.autoscaler.sdk.request_resources(num_cpus=0)
      gpu_actor = ray.get_actor("gpu_actor")
      ray.kill(gpu_actor)
  
label_desc: Use image node_id 1 for calling a global function with example usage: main() without return types