lenskit.data.matrix.SparseIndexType
===================================

.. py:class:: lenskit.data.matrix.SparseIndexType(dimension)
   

   Bases: :py:obj:`pyarrow.ExtensionType`


   Data type for the index field of a sparse row.  Indexes are just stored as
   ``int32``s; the extension type attaches the row's dimensionality to the index
   field (making it easier to pass it to/from Rust, since we often pass arrays
   and not entire fields).

   .. stability:: internal


   .. py:attribute:: dimension
      :type:  int


   .. py:method:: check_dimension(expected)

      Check that this index type has the expected dimension.

      :returns: The dimension of the index type.

      :raises ValueError: If the type's dimension does not match the expected dimension.



   .. py:method:: __arrow_ext_serialize__()


   .. py:method:: __arrow_ext_deserialize__(storage_type, serialized)
      :classmethod: