class_docstr: An attack generates adversarial examples on text.
  
  This is an abstract class that contains main helper functionality for
  attacks. An attack is comprised of a search method, goal function,
  a transformation, and a set of one or more linguistic constraints that
  successful examples must meet.
class_docstr_tok: ["An","attack","generates","adversarial","examples","on","text",".","This","is","an","abstract","class","that","contains","main","helper","functionality","for","attacks",".","An","attack","is","comprised","of","a","search","method",",","goal","function",",","a","transformation",",","and","a","set","of","one","or","more","linguistic","constraints","that","successful","examples","must","meet","."]
code: def clear_cache(self, recursive=True):
      self.constraints_cache.clear()
      if self.use_transformation_cache:
          self.transformation_cache.clear()
      if recursive:
          self.goal_function.clear_cache()
          for constraint in self.constraints:
              if hasattr(constraint, "clear_cache"):
                  constraint.clear_cache()
  
imports: import lru
  from collections import deque
  from ...common import logger
  from textattack.attack_results import FailedAttackResult, MaximizedAttackResult, SuccessfulAttackResult
  from textattack.goal_function_results import GoalFunctionResultStatus
  from textattack.shared import AttackedText, utils
  from textattack.transformations import CompositeTransformation
label_desc: Use image node_id 3 for calling the Attack obj's underlying member method code with example usage: obj.clear_cache(recursive) without return types