code: def reset(self, history=None):
          
          if not history:
              history = dict()
  
          self.episode_rewards = history.get("episode_rewards", list())
          self.episode_timesteps = history.get("episode_timesteps", list())
          self.episode_times = history.get("episode_times", list())
docs: Resets the Runner's internal stats counters.
          If history is empty, use default values in history.get().
  
          Args:
              history (dict): A dictionary containing an already run experiment's results. Keys should be:
                  episode_rewards (list of rewards), episode_timesteps (lengths of episodes), episode_times (run-times)