SamplingKind
============

.. py:class:: t3toolbox.backend.fitting.SamplingKind

   A sampling kind's bare primitives, bundled so the GN model is generic over the kind.

   Holds the kind-specific functions the geometry-generic Gauss-Newton model needs -- the bare ``𝒥`` /
   ``𝒥ᵀ`` (no gauge ``Π``: that is the geometry's), the ``‖·‖²`` reduction, and the sample-stack axis
   count. The model binds one of :py:data:`APPLY` / :py:data:`ENTRIES` / :py:data:`PROBE`; the geometry
   supplies ``Π`` around them. ``sample`` is the kind's measurement spec: the probe/apply vectors ``ww``
   (apply / probe) or the integer grid ``index`` (entries).


   .. py:attribute:: name
      :type:  str


   .. py:attribute:: precompute
      :type:  t3toolbox.backend.common.typ.Callable


   .. py:attribute:: forward
      :type:  t3toolbox.backend.common.typ.Callable


   .. py:attribute:: transpose
      :type:  t3toolbox.backend.common.typ.Callable


   .. py:attribute:: sumsq
      :type:  t3toolbox.backend.common.typ.Callable


   .. py:attribute:: w_axes
      :type:  t3toolbox.backend.common.typ.Callable


   .. py:attribute:: point_forward
      :type:  t3toolbox.backend.common.typ.Callable


   .. py:attribute:: n_measurements
      :type:  t3toolbox.backend.common.typ.Callable


   .. py:attribute:: take
      :type:  t3toolbox.backend.common.typ.Callable


   .. py:attribute:: block_sumsq
      :type:  t3toolbox.backend.common.typ.Optional[t3toolbox.backend.common.typ.Callable]
      :value: None