code: def concate_parts(input_dict: Dict) -> Dict:
      for key in input_dict:
          input_dict[key] = list(itertools.chain(*input_dict[key]))
      return input_dict
  
imports: import itertools
  import warnings
  from typing import Union, List, Tuple, Dict, Optional
  from collections import defaultdict
  import numpy
  import inspect
  from collections import namedtuple
  from math import ceil
label_desc: Use image node_id 9 for calling the TokenizerWrapper obj's underlying member method code with example usage: obj.concate_parts(input_dict) and returns: input_dict