code: def ascii_codec():
      """default ascii codec
  
      Returns
      -------
      Codec
          codec based on the default ascii characters
      """
      ascii_labels = ["", " ", "~"] + [chr(x) for x in range(33, 126)]
      return Codec(ascii_labels)
  
file_path: calamari/calamari_ocr/ocr/dataset/codec.py
imports: from dataclasses import dataclass, field
  from typing import List, TYPE_CHECKING, Iterator, Set
  from paiargparse import pai_dataclass, pai_meta
  from tfaip.util.multiprocessing.parallelmap import tqdm_wrapper
  from tfaip.data.pipeline.definitions import PipelineMode
  from calamari_ocr.utils import glob_all
label_desc: Use image node_id 1 for calling a global function with example usage: ascii_codec() and returns: Codec