code: def test_grid_gp_mean_abs_error_cuda(self):
      if torch.cuda.is_available():
          with least_used_cuda_device():
              self.test_grid_gp_mean_abs_error(cuda=True)
  
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 4 for calling the TestGridGPRegression obj's underlying member method code with example usage: obj.test_grid_gp_mean_abs_error_cuda() without return types