code: def __call__(self, env: CallbackEnv):
      if self.is_rank_0:
          print(f"[Rank 0] I am at iteration {env.iteration}")
  
file_path: ray/release/lightgbm_tests/workloads/release_test_util.py
imports: import glob
  import os
  import time
  import ray
  from lightgbm_ray import train, RayDMatrix, RayFileType, RayParams, RayDeviceQuantileDMatrix
  from lightgbm_ray.tune import _TuneLGBMRank0Mixin
  from lightgbm.callback import CallbackEnv
label_desc: Use image node_id 1 for calling the TrackingCallback obj's underlying member method code with example usage: obj.__call__(env) without return types