code: def test_head_node_without_cpu(ray_start_cluster):
      @ray.remote(num_cpus=1)
      def f():
          return 1
  
      f.remote()
  
      check_count = 0
      demand_1cpu = " {'CPU': 1.0}:"
      while True:
          status = subprocess.check_output(["ray", "status"]).decode()
          if demand_1cpu in status:
              break
          check_count += 1
          assert (
              check_count < 5
          ), f"Incorrect demand. Last status {status}"
          time.sleep(1)
  
      @ray.remote(num_cpus=2)
      def g():
          return 2
  
      g.remote()
  
      check_count = 0
      demand_2cpu = " {'CPU': 2.0}:"
      while True:
          status = subprocess.check_output(["ray", "status"]).decode()
          if demand_1cpu in status and demand_2cpu in status:
              break
          check_count += 1
          assert (
              check_count < 5
          ), f"Incorrect demand. Last status {status}"
          time.sleep(1)
  
imports: import collections
  import logging
  import platform
  import subprocess
  import sys
  import time
  import unittest
  import numpy
  import pytest
  import ray
  import ray.cluster_utils
  import ray.util.accelerators
  from ray._private.internal_api import memory_summary
  from ray.util.scheduling_strategies import PlacementGroupSchedulingStrategy
  from ray._private.test_utils import Semaphore, SignalActor, object_memory_usage, get_metric_check_condition, wait_for_condition, MetricSamplePattern
label_desc: Use image node_id 17 for calling a global function with example usage: test_head_node_without_cpu(ray_start_cluster) and returns: int, int