code: def test_smoothed_states(self):
      assert_allclose(
          self.res.smoothed_state[0], self.res_desired.smoothed_state[0]
      )
  
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 11 for calling the TestLargeStateCovAR1 obj's underlying member method code with example usage: obj.test_smoothed_states() without return types