code: def __init__(self, env, max_timelimit, skip_num=4):
      gym.Wrapper.__init__(self, env)
      self.max_timelimit = max_timelimit
      self.skip_num = skip_num
  
      self.step_fea = self.max_timelimit
  
imports: import copy
  import numpy
  import gym
  import abc
  import math
  from osim.env import L2M2019Env
  from parl.utils import logger
label_desc: Use image node_id 1 to create a new ObsTranformerBase object from inherited base classes: gym with example: obj = ObsTranformerBase(env, max_timelimit, skip_num)