code: def setup_class(cls):
      pytest.skip(
          "TODO: This test is skipped since an exception is currently "
          "raised if k_posdef > k_states. However, this test could be "
          "used if models of those types were allowed"
      )
  
      # Data: just some sample data
      endog = [0.2, -1.5, -0.3, -0.1, 1.5, 0.2, -0.3, 0.2, 0.5, 0.8]
  
      # Params
      params = [0.5, 1]
  
      # Desired model: AR(1)
      mod_desired = sarimax.SARIMAX(endog)
      cls.res_desired = mod_desired.smooth(params)
  
      # Test class
      mod = LargeStateCovAR1(endog)
      cls.res = mod.smooth(params)
  
imports: import numpy
  import pandas
  import os
  import pytest
  from statsmodels.tsa.statespace import mlemodel, sarimax
  from statsmodels import datasets
  from numpy.testing import assert_equal, assert_allclose, assert_raises
label_desc: Use image node_id 1 for calling the TestLargeStateCovAR1 obj's underlying member method code with example usage: obj.setup_class(cls) without return types