class_docstr: Attempts to minimize the BLEU score between the current output
  translation and the reference translation.
  
      BLEU score was defined in (BLEU: a Method for Automatic Evaluation of Machine Translation).
  
      `ArxivURL`_
  
  .. _ArxivURL: https://www.aclweb.org/anthology/P02-1040.pdf
  
      This goal function is defined in (It’s Morphin’ Time! Combating Linguistic Discrimination with Inflectional Perturbations).
  
      `ArxivURL2`_
  
  .. _ArxivURL2: https://www.aclweb.org/anthology/2020.acl-main.263
code: def clear_cache(self):
      if self.use_cache:
          self._call_model_cache.clear()
      get_bleu.cache_clear()
  
file_path: TextAttack/textattack/goal_functions/text/minimize_bleu.py
imports: import functools
  import nltk
  import textattack
  from .text_to_text_goal_function import TextToTextGoalFunction
label_desc: Use image node_id 2 for calling the MinimizeBleu obj's underlying member method code with example usage: obj.clear_cache() without return types