code: def after_iteration(self, model, epoch, evals_log):
      if epoch == self._iteration:
          rank = get_actor_rank()
          if rank in self._ranks:
              if not ray.get(self._state.has_failed.remote(self._id)):
                  success = ray.get(
                      self._state.set_failed.remote(self._id)
                  )
                  if not success:
                      # Another rank is already about to fail
                      return
  
                  pid = os.getpid()
                  print(f"Killing process: {pid} for actor rank {rank}")
                  time.sleep(1)
                  os.kill(pid, 9)
  
imports: import glob
  import os
  import time
  import ray
  from xgboost_ray import train, RayDMatrix, RayFileType, RayDeviceQuantileDMatrix, RayParams
  from xgboost_ray.session import get_actor_rank, put_queue
  from xgboost.callback import TrainingCallback
  from xgboost.rabit import get_world_size
label_desc: Use image node_id 2 for calling the FailureInjection obj's underlying member method code with example usage: obj.after_iteration(model, epoch, evals_log) without return types