def METHOD_NAME(self):
    if hasattr(self, "min_n_eff"):
        with self.model:
            idata = to_inference_data(self.trace[self.burn :])
        n_eff = az.ess(idata)
        for var in n_eff:
            npt.assert_array_less(self.min_n_eff, n_eff[var])