def hessian(self, AB_mask):
        loglike = self.loglike
        return approx_hess(AB_mask, loglike)
Gets group names which shouldn't exist on the cluster.
dataset/ETHPy150Open statsmodels/statsmodels/statsmodels/tsa/vector_ar/svar_model.py/SVAR.hessian--crossover with--dataset/ETHPy150Open ganeti/ganeti/qa/qa_utils.py/GetNonexistentGroups