code: def normalize_unit(self, unit):
      # Normalize minimal units used by the tokenizer
      return unit
  
file_path: stanza/stanza/models/tokenization/vocab.py
imports: from collections import Counter
  import re
  from stanza.models.common.vocab import BaseVocab
  from stanza.models.common.vocab import UNK, PAD
label_desc: Use image node_id 3 for calling the Vocab obj's underlying member method code with example usage: obj.normalize_unit(unit) and returns: unit