code: def before_iteration(self, model, epoch, evals_log):
      if get_actor_rank() == 3:
          print(f"[Rank {get_actor_rank()}] I am at iteration {epoch}")
      put_queue(get_world_size())
  
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 1 for calling the TrackingCallback obj's underlying member method code with example usage: obj.before_iteration(model, epoch, evals_log) without return types