code: def ignore(example):
      """
      This function makes sure specific class types like 'PLAIN', 'ELECTRONIC' etc. are left unchanged.
  
      Args:
          example: data example
      """
      cls, _, _ = example
      if cls in ["PLAIN", "LETTERS", "ELECTRONIC", "VERBATIM", "PUNCT"]:
          example[2] = "<self>"
      if example[1] == "I" and re.search("(first|one)", example[2]):
          example[2] = "<self>"
  
file_path: NeMo/examples/nlp/duplex_text_normalization/data/en/data_preprocessing.py
imports: import os
  from argparse import ArgumentParser
  import inflect
  import regex
  from tqdm import tqdm
  from nemo.collections.common.tokenizers.moses_tokenizers import MosesProcessor
  from nemo.collections.nlp.data.text_normalization.constants import EN_GREEK_TO_SPOKEN
  from nemo.collections.nlp.data.text_normalization.utils import add_space_around_dash, convert_fraction, convert_superscript
  from nemo.utils import logging
label_desc: Use image node_id 4 for calling a global function with example usage: ignore(example) without return types