load_core_families
==================

.. py:function:: t3toolbox.backend.common.load_core_families(file)

   .. code-block:: python

      def load_core_families(
              file,  # path or open file object to read the .npz from
      ) -> typ.Tuple[
          typ.Tuple[NDArray, ...],  # one core-family per element
          ...,
      ]:


   Inverse of :py:func:`save_core_families`: load a ``.npz`` file into a tuple of core-families.

   The number of families is inferred from the highest ``'f{fi}_...'`` key; each family is returned
   as a tuple of arrays ordered by core index.