def simple_reduce(self, rank):
        if self.collapsed is not None:
            return
        assert rank > 0
        while len(self.cs) > rank:
            del self.cs[0]
            del self.ds[0]
Confirm last non-preserve config sent to Nexus
dataset/ETHPy150Open scipy/scipy/scipy/optimize/nonlin.py/LowRankMatrix.simple_reduce--crossover with--dataset/ETHPy150Open openstack/networking-cisco/networking_cisco/tests/unit/ml2/drivers/cisco/nexus/test_cisco_mech.py/CiscoML2MechanismTestCase._is_in_first_nexus_cfg