code: def create_mean(self):
      return ConstantMeanGradGrad(
          batch_shape=self.__class__.batch_shape or torch.Size()
      )
  
file_path: gpytorch/test/means/test_constant_mean_gradgrad.py
imports: import unittest
  import torch
  from gpytorch.means import ConstantMeanGradGrad
  from gpytorch.test.base_mean_test_case import BaseMeanTestCase
label_desc: Use image node_id 1 for calling the TestConstantMeanGradGrad obj's underlying member method code with example usage: obj.create_mean() and returns: ConstantMeanGradGrad