@Utils.timeIt
    def Jvec(self, m, v, u=None):
        raise NotImplementedError('J is not yet implemented.')
Factory function for the Registry class.
dataset/ETHPy150Open simpeg/simpeg/SimPEG/Problem.py/BaseProblem.Jvec--crossover with--dataset/ETHPy150Open tjguk/winsys/winsys/registry.py/registry