code: def create_likelihood(self):
      return MultitaskGaussianLikelihood(
          num_tasks=4, rank=2, batch_shape=torch.Size([3])
      )
  
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 1 for calling the TestMultitaskGaussianLikelihoodBatch obj's underlying member method code with example usage: obj.create_likelihood() and returns: MultitaskGaussianLikelihood