code: def __init__(self, indicator_file):
      self.indicator_file = indicator_file
  
imports: from typing import Optional
  import argparse
  import os
  import pickle
  import tempfile
  import time
  import ray
  from ray import train, tune
  from ray.train import Checkpoint
  from ray.rllib.algorithms.callbacks import DefaultCallbacks
  from ray.rllib.algorithms.ppo import PPO
  from run_cloud_test import ARTIFACT_FILENAME, CHECKPOINT_DATA_FILENAME
label_desc: Use image node_id 1 to create a new IndicatorCallback object from inherited base classes: tune with example: obj = IndicatorCallback(indicator_file)