code: def ping(self):
      # Exit process with some probability.
      exit_chance = np.random.rand()
      if exit_chance > self.death_probability:
          sys.exit(-1)
  
file_path: ray/release/long_running_tests/workloads/actor_deaths.py
imports: import numpy
  import sys
  import time
  import ray
  from ray.cluster_utils import Cluster
  from ray._private.test_utils import monitor_memory_usage, safe_write_to_results_json
label_desc: Use image node_id 2 for calling the Child obj's underlying member method code with example usage: obj.ping() without return types