code: def save(self, filepath):
      # sort_keys=False to ensure that token usage dictionaries (keyed by integers) are encodable.
      # save_json(filepath, self.__dict__, sort_keys=False)
      save_json(filepath, self.__dict__)
  
imports: import logging
  from collections import defaultdict
  from typing import Dict, List, Tuple, TYPE_CHECKING
  from ludwig.api_annotations import DeveloperAPI
  from ludwig.constants import AUTO, COMBINED, LOSS
  from ludwig.models.base import BaseModel
  from ludwig.modules.metric_modules import get_best_function
  from ludwig.utils.data_utils import save_json
  from ludwig.utils.metric_utils import TrainerMetric
label_desc: Use image node_id 2 for calling the ProgressTracker obj's underlying member method code with example usage: obj.save(filepath) without return types