class_docstr: Base class for all text based default handler.
  Contains various text based utility methods
class_docstr_tok: ["Base","class","for","all","text","based","default","handler",".","Contains","various","text","based","utility","methods"]
code: def __init__(self):
      super().__init__()
      self.source_vocab = None
      self.tokenizer = get_tokenizer("basic_english")
      self.input_text = None
      self.lig = None
      self.initialized = None
  
imports: import logging
  import os
  import re
  import string
  import unicodedata
  from abc import ABC
  import torch
  import torch.nn.functional
  from captum.attr import LayerIntegratedGradients
  from torchtext.data.utils import get_tokenizer
  from ..utils.util import CLEANUP_REGEX
  from .base_handler import BaseHandler
  from .contractions import CONTRACTION_MAP
label_desc: Use image node_id 1 to create a new TextHandler object from inherited base classes: BaseHandler, ABC with example: obj = TextHandler()