code: def test_lkj_prior_validate_args(self):
      LKJPrior(2, 1.0, validate_args=True)
      with self.assertRaises(ValueError):
          LKJPrior(1.5, 1.0, validate_args=True)
      with self.assertRaises(ValueError):
          LKJPrior(2, -1.0, validate_args=True)
  
imports: import unittest
  from math import exp
  import torch
  from torch.distributions import LKJCholesky
  from gpytorch.priors import LKJCholeskyFactorPrior, LKJCovariancePrior, LKJPrior, SmoothedBoxPrior
  from gpytorch.priors.lkj_prior import _is_valid_correlation_matrix, _is_valid_correlation_matrix_cholesky_factor
  from gpytorch.test.utils import approx_equal, least_used_cuda_device
label_desc: Use image node_id 2 for calling the TestLKJPrior obj's underlying member method code with example usage: obj.test_lkj_prior_validate_args() without return types