code: def create_likelihood(self):
      return MultitaskGaussianLikelihood(num_tasks=4, rank=2)
  
imports: import unittest
  import torch
  from linear_operator.operators import KroneckerProductLinearOperator, RootLinearOperator, ToeplitzLinearOperator
  from gpytorch.distributions import MultitaskMultivariateNormal
  from gpytorch.likelihoods import MultitaskGaussianLikelihood
  from gpytorch.test.base_likelihood_test_case import BaseLikelihoodTestCase
label_desc: Use image node_id 4 for calling the TestMultitaskGaussianLikelihood obj's underlying member method code with example usage: obj.create_likelihood() and returns: MultitaskGaussianLikelihood