code: def test_predict(self):
      assert_almost_equal(
          self.res_ps.predict(self.x),
          self.res2.fittedvalues,
          decimal=13,
      )
      assert_almost_equal(
          self.res_ps.predict(self.x[:10]),
          self.res2.fittedvalues[:10],
          decimal=13,
      )
  
imports: import numpy
  from numpy.testing import assert_almost_equal, assert_equal
  from statsmodels.sandbox.nonparametric import smoothers
  from statsmodels.regression.linear_model import OLS, WLS
label_desc: Use image node_id 1 for calling the CheckSmoother obj's underlying member method code with example usage: obj.test_predict() without return types