code: def in_alphabet(c):
      return ALPHABET.CanEncode(c) if ALPHABET else True
  
file_path: DeepSpeech/bin/import_tuda.py
imports: import argparse
  import csv
  import os
  import tarfile
  import unicodedata
  import wave
  import xml.etree.ElementTree
  from collections import Counter
  import progressbar
  from deepspeech_training.util.downloader import SIMPLE_BAR, maybe_download
  from deepspeech_training.util.importers import validate_label_eng
  from ds_ctcdecoder import Alphabet
label_desc: Use image node_id 2 for calling a global function with example usage: in_alphabet(c) and returns: unknown