utv_apply
=========

.. py:function:: t3toolbox.backend.utv_sampling.utv_apply(ww, frame_data, variations_data)

   .. code-block:: python

      def utv_apply(
              ww,               # apply vectors, len=d, ith elm_shape=W+(Ni,)
              frame_data,       # UT3Frame .data
              variations_data,  # UT3Variations .data
      ):  # -> scalar apply, shape=W+K+C


   Apply a uniform tangent vector in all modes (the bare ``𝒥``; a scalar per stack element).