code: def __iter__(self):
      self.current_index = 0
      return self
  
file_path: SerpentAI/serpent/machine_learning/reinforcement_learning/rainbow_dqn/replay_memory.py
imports: import collections
  import random
  import torch
  from serpent.machine_learning.reinforcement_learning.rainbow_dqn.segment_tree import SegmentTree
label_desc: Use image node_id 2 for calling the ReplayMemory obj's underlying member method code with example usage: obj.__iter__() and returns: self