code: def distribution_cls(self):
      return gpytorch.variational.MeanFieldVariationalDistribution
  
imports: import unittest
  import torch
  import gpytorch
  from gpytorch.test.variational_test_case import VariationalTestCase
label_desc: Use image node_id 2 for calling the TestVNNGP obj's underlying member method code with example usage: obj.distribution_cls() and returns: gpytorch