@pytest.mark.smoke
def test_fit_em(self, **kwargs):
    res_em = self.model._fit_em(**kwargs)
    assert_allclose(res_em.llf, self.true['llf_fit_em'], atol=self.atol, rtol=self.rtol)
@pytest.mark.smoke
def test_fit_em(self, **kwargs):
    res_em = self.model._fit_em(**kwargs)
    assert_allclose(res_em.llf, self.true['llf_fit_em'], atol=self.atol, rtol=self.rtol)