code: def run_driver():
      output = run_string_as_driver(driver_script, encode="utf-8")
      assert "success" in output
  
imports: import time
  import argparse
  import ray
  from ray.cluster_utils import Cluster
  from ray._private.test_utils import run_string_as_driver, safe_write_to_results_json
label_desc: Use image node_id 2 for calling a global function with example usage: run_driver() without return types