code: def viewer_setup(self):
      assert self.viewer is not None
      for key, value in DEFAULT_CAMERA_CONFIG.items():
          if isinstance(value, np.ndarray):
              getattr(self.viewer.cam, key)[:] = value
          else:
              setattr(self.viewer.cam, key, value)
  
file_path: gym/gym/envs/mujoco/hopper_v3.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 9 for calling the HopperEnv obj's underlying member method code with example usage: obj.viewer_setup() without return types