class_docstr: Transforms an input by replacing its number word
  
  Exmaple::
  
  {
      sentence1: 桌子上放了两本书。
      sentence2: 有四本书放在桌子上。
      label: 0
  }
code: def __repr__(self):
      return "SwapNum"
  
file_path: textflint/textflint/generation/transformation/SMCN/swap_num.py
imports: from ..transformation import Transformation
  from ....common.utils.cn_num_word import _get_contradictory_hypothesis
label_desc: Use image node_id 2 for calling the SwapNum obj's underlying member method code with example usage: obj.__repr__() and returns: str