code: def _get_observation(self, state_desc):
      pass
  
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 3 for calling the ObsTranformerBase obj's underlying member method code with example usage: obj._get_observation(state_desc) without return types