code: def step(self, action):
      obs = np.random.randn(17)
      reward = np.random.choice([0.0, 1.0])
      done = np.random.choice([True, False], p=[0.01, 0.99])
      info = {}
      return obs, reward, done, info
  
imports: import numpy
  from random import random
label_desc: Use image node_id 2 for calling the HalfCheetahEnv obj's underlying member method code with example usage: obj.step(action) and returns: obs,  reward,  done,  info