code: def _get_obs(self):
      qpos = self.sim.data.qpos
      qvel = self.sim.data.qvel
      return np.concatenate([qpos[1:], np.clip(qvel, -10, 10)]).ravel()
  
file_path: gym/gym/envs/mujoco/walker2d.py
imports: import numpy
  from gym import utils
  from gym.envs.mujoco import MuJocoPyEnv
  from gym.spaces import Box
label_desc: Use image node_id 3 for calling the Walker2dEnv obj's underlying member method code with example usage: obj._get_obs() and returns: np