class_docstr: Maintain incomplete trajectories data of actor.
code: def reset(self):
      self.memory = []
      self.last_target_changed_steps = 0
  
imports: import os
  import parl
  import queue
  import six
  import threading
  import time
  import numpy
  from actor import Actor
  from opensim_model import OpenSimModel
  from opensim_agent import OpenSimAgent
  from parl.utils import logger, summary, get_gpu_count
  from replay_memory import ReplayMemory
  from parl.utils.window_stat import WindowStat
  from parl.remote.client import get_global_client
  from parl.utils import machine_info
label_desc: Use image node_id 2 for calling the ActorState obj's underlying member method code with example usage: obj.reset() without return types