code: def current_success_rate(self):
      return np.mean(self.success_history)
  
file_path: baselines/baselines/her/rollout.py
imports: from collections import deque
  import numpy
  import pickle
  from baselines.her.util import convert_episode_to_batch_major, store_args
label_desc: Use image node_id 5 for calling the RolloutWorker obj's underlying member method code with example usage: obj.current_success_rate() and returns: np