code: def iteration_completed(self):
      filename = datetime.datetime.now().strftime(
          f"stats_{self.run_id}.json"
      )
      filename = os.path.join(self.output_dir, filename)
  
      stats = prepare_stats(self.start_ts, self.trainer, self.evaluator)
      with open(filename, "w") as f:
          json.dump(stats, f, indent=2)
  
      if self._stats_path:
          shutil.copy(filename, self._stats_path)
  
      publish_path = self._publish_path
      if publish_path:
          final_model = os.path.join(
              self.output_dir, self._key_metric_filename
          )
          if os.path.exists(final_model):
              if not os.path.exists(publish_path) or not filecmp.cmp(
                  publish_path, final_model
              ):
                  shutil.copy(final_model, publish_path)
                  logger.info(
                      f"New Model published: {final_model} => {publish_path}"
                  )
      return stats
  
file_path: MONAILabel/monailabel/tasks/train/handler.py
imports: import datetime
  import filecmp
  import json
  import logging
  import os
  import shutil
  import time
  from typing import Any, Dict
  import torch
  from monai.engines.workflow import Engine, Events
label_desc: Use image node_id 2 for calling the PublishStatsAndModel obj's underlying member method code with example usage: obj.iteration_completed() and returns: stats