class_docstr: Transforms an input by replacing its words with synonyms in the stored
  synonyms bank generated by the OpenHowNet.
code: def extra_repr_keys(self):
      return ["max_candidates"]
  
file_path: TextAttack/textattack/transformations/word_swaps/word_swap_hownet.py
imports: import pickle
  from textattack.shared import utils
  from .word_swap import WordSwap
label_desc: Use image node_id 4 for calling the WordSwapHowNet obj's underlying member method code with example usage: obj.extra_repr_keys() and returns: list