utv_probe_jacobian_from_sweep
=============================

.. py:function:: t3toolbox.backend.utv_sampling.utv_probe_jacobian_from_sweep(variations_data, frame_sweep)

   .. code-block:: python

      def utv_probe_jacobian_from_sweep(
              variations_data,  # UT3Variations .data; stack = K + C
              frame_sweep,       # = utv_precompute_probe_frame_sweep(...)
      ):  # -> PACKED probes, shape=(d,)+W+K+C+(N,)  (the inner-loop path is packed; no unpack)


   Forward probe of a uniform tangent reusing the frame sweep (the bare ``𝒥``): mask-once the variation,
   share :py:func:`probing.tv_probe_jacobian_from_sweep`. **Packed** output (the split-seam is the optimizer's
   inner-loop path, which stays packed; use :py:func:`utv_probe` or ``unpack_vectors`` for ragged).