def eval_objfn(self):
        """Compute components of objective function as well as total
        contribution to objective function.
        """

        dfd = self.obfn_f()
        reg = self.obfn_reg()
        obj = dfd + reg[0]
        return (obj, dfd) + reg[1:]
Compute components of objective function as well as total
        contribution to objective function.