class_docstr: Convert between text-label and text-index 
class_docstr_tok: ["Convert","between","text-label","and","text-index"]
code: def get_ignored_tokens(self):
      return [0]
  
imports: import cv2
  import copy
  import numpy
  import math
  import re
  import sys
  import argparse
  import string
  from copy import deepcopy
  from argparse import ArgumentParser, RawDescriptionHelpFormatter
  import yaml
label_desc: Use image node_id 4 for calling the BaseRecLabelDecode obj's underlying member method code with example usage: obj.get_ignored_tokens() and returns: list