@property
    def W(self):
        if getattr(self, '_W', None) is None:
            wlist = (self.Ws, self.Wsmooth)
            self._W = sp.vstack(wlist)
        return self._W
Update APT package definitions.
dataset/ETHPy150Open simpeg/simpeg/SimPEG/Regularization.py/Tikhonov.W--crossover with--dataset/ETHPy150Open ronnix/fabtools/fabtools/deb.py/update_index