docstr: Clean the memory by removing all the episodes
  :return: None
docstr_tok: ["Clean","the","memory","by","removing","all","the","episodes",":","return",":","None"]
code: def clean(self, lock: bool = True) -> None:
      """
      Clean the memory by removing all the episodes
      :return: None
      """
      if lock:
          self.reader_writer_lock.lock_writing_and_reading()
  
      self.transitions = [[] for _ in range(self.num_classes)]
      self.transitions_order = []
      self._num_transitions = 0
  
      if lock:
          self.reader_writer_lock.release_writing_and_reading()
  
imports: import operator
  import random
  from enum import Enum
  from typing import List, Tuple, Any, Union
  import numpy
  from rl_coach.core_types import Transition
  from rl_coach.memories.memory import MemoryGranularity
  from rl_coach.memories.non_episodic.experience_replay import ExperienceReplayParameters, ExperienceReplay
  from rl_coach.schedules import Schedule, ConstantSchedule
label_desc: Use image node_id 7 for calling the BalancedExperienceReplay obj's underlying member method code with example usage: obj.clean(lock) without return types