code: def tearDown(self):
      if hasattr(self, "rng_state"):
          torch.set_rng_state(self.rng_state)
  
imports: import math
  import os
  import random
  import unittest
  import warnings
  import torch
  from torch import optim
  import gpytorch
  from gpytorch.test.utils import least_used_cuda_device
  from gpytorch.utils.warnings import GPInputWarning
label_desc: Use image node_id 2 for calling the TestGridGPRegression obj's underlying member method code with example usage: obj.tearDown() without return types