code: def __post_init__(self):
      self.created_datetime = self.get_current_datetime()
  
imports: import argparse
  import copy
  import json
  import os
  import random
  import tarfile
  from collections import defaultdict
  from dataclasses import dataclass, field
  from datetime import datetime
  from io import BytesIO
  from typing import Any, List, Optional
  import numpy
  import soundfile
  from joblib import Parallel, delayed
  from omegaconf import DictConfig, OmegaConf, open_dict
label_desc: Use image node_id 1 for calling the ASRTarredDatasetMetadata obj's underlying member method code with example usage: obj.__post_init__() without return types