GaussNewtonModel.objective_value
================================

.. py:method:: t3toolbox.fitting.GaussNewtonModel.objective_value()

   .. code-block:: python

      def objective_value(self) -> NDArray:  # c = ½‖r‖² (+ ρ(X)), shape C


   The least-squares objective at the frame, ``c = ½‖r‖²`` (the model constant ``m(0)``); plus
   ``ρ(X)`` when a ``regularizer`` is set (``X`` = the frame's tensor ``(U, P)``).