code: def mll_cls(self):
      return gpytorch.mlls.VariationalELBO
  
imports: import unittest
  import torch
  import gpytorch
  from gpytorch.test.variational_test_case import VariationalTestCase
label_desc: Use image node_id 3 for calling the TestVNNGP obj's underlying member method code with example usage: obj.mll_cls() and returns: gpytorch