code: def _is_ray_cluster():
      """Checks if the bootstrap config file exists.
  
      This will always exist if using an autoscaling cluster/started
      with the ray cluster launcher.
      """
      return Path("~/ray_bootstrap_config.yaml").expanduser().exists()
  
label_desc: Use image node_id 1 for calling a global function with example usage: _is_ray_cluster() and returns: Path