code: def __str__(self):
      return json.dumps(self)
  
file_path: audio/examples/pipeline_wav2letter/utils.py
imports: import json
  import logging
  import os
  import shutil
  from collections import defaultdict
  import torch
label_desc: Use image node_id 2 for calling the MetricLogger obj's underlying member method code with example usage: obj.__str__() and returns: json