def refresh_droot_impact(self):
        if self.stale_droot:
            self.droot, self.impact, self.root_destroyer =\
                _build_droot_impact(self)
            self.stale_droot = False
        return self.droot, self.impact, self.root_destroyer
Makes sure self.droot, self.impact, and self.root_destroyer are up to
dataset/ETHPy150Open rizar/attention-lvcsr/libs/Theano/theano/gof/destroyhandler.py/DestroyHandler.refresh_droot_impact