class_docstr: Reward shaping wrapper for test
class_docstr_tok: ["Reward","shaping","wrapper","for","test"]
code: def reward_shaping(self, state_desc, r2_reward, done, action):
      return {"shaping_reward": 0}
  
imports: import abc
  import gym
  import math
  import numpy
  import random
  from collections import OrderedDict
  from osim.env import ProstheticsEnv
  from parl.utils import logger
  from tqdm import tqdm
label_desc: Use image node_id 2 for calling the TestReward obj's underlying member method code with example usage: obj.reward_shaping(state_desc, r2_reward, done, action) and returns: dict