class_docstr: Transforms an input by replacing its antonym
  
  Exmaple::
  
  {
      sentence1: 我喜欢这本书。
      sentence2: 这本书是我讨厌的。
      label: 0
  }
code: def __repr__(self):
      return "SwapWord"
  
file_path: textflint/textflint/generation/transformation/SMCN/swap_word.py
imports: from textflint.generation.transformation.UTCN.cn_get_antonym import CnAntonym
  from textflint.input.component.sample.utcn_sample import UTCnSample
  from ..transformation import Transformation
label_desc: Use image node_id 2 for calling the SwapWord obj's underlying member method code with example usage: obj.__repr__() and returns: str