utv_entries
===========

.. py:function:: t3toolbox.backend.utv_sampling.utv_entries(index, frame_data, variations_data)

   .. code-block:: python

      def utv_entries(
              index,            # int array, shape=(d,)+W -- the (stack W of) multi-indices
              frame_data,       # UT3Frame .data
              variations_data,  # UT3Variations .data
      ):  # -> scalar entries, shape=W+K+C


   Entries of a uniform tangent vector at ``index`` (the bare ``𝒥``; fiber slicing, no packing -- the
   real indices ``index_i < Ni`` never reach the mode padding).