code: def sample(self, n):
      assert len(self.memory) >= n
      return self.memory.sample(n)
  
file_path: chainerrl/chainerrl/replay_buffers/episodic.py
imports: import collections
  import pickle
  from chainerrl.misc.collections import RandomAccessQueue
  from chainerrl.replay_buffer import AbstractEpisodicReplayBuffer
  from chainerrl.replay_buffer import random_subseq
label_desc: Use image node_id 3 for calling the EpisodicReplayBuffer obj's underlying member method code with example usage: obj.sample(n) and returns: self