code: def count(self):
      return len(self.episode_state)
  
file_path: PARL/benchmark/fluid/QMIX/replay_buffer.py
imports: from collections import deque
  import numpy
  import random
label_desc: Use image node_id 2 for calling the EpisodeExperience obj's underlying member method code with example usage: obj.count() and returns: len