.. ******************************************************************************
.. * Copyright 2020 Intel Corporation
.. *
.. * Licensed under the Apache License, Version 2.0 (the "License");
.. * you may not use this file except in compliance with the License.
.. * You may obtain a copy of the License at
.. *
.. *     http://www.apache.org/licenses/LICENSE-2.0
.. *
.. * Unless required by applicable law or agreed to in writing, software
.. * distributed under the License is distributed on an "AS IS" BASIS,
.. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
.. * See the License for the specific language governing permissions and
.. * limitations under the License.
.. *******************************************************************************/

.. highlight:: cpp
.. default-domain:: cpp

.. _api_kmeans_init:

======================
K-Means initialization
======================

.. include:: ../../../includes/clustering/kmeans-init-introduction.rst

------------------------
Mathematical formulation
------------------------

Refer to :ref:`Developer Guide: K-Means Initialization <alg_kmeans_init>`.

---------------------
Programming Interface
---------------------

All types and functions in this section are declared in the
``oneapi::dal::kmeans_init`` namespace and be available via inclusion of the
``oneapi/dal/algo/kmeans_init.hpp`` header file.

Descriptor
----------
.. onedal_class:: oneapi::dal::kmeans_init::descriptor

Method tags
~~~~~~~~~~~
.. onedal_tags_namespace:: oneapi::dal::kmeans_init::method

Task tags
~~~~~~~~~
.. onedal_tags_namespace:: oneapi::dal::kmeans_init::task

Computing :cpp:expr:`compute(...)`
--------------------------------------

.. _kmeans_init_c_api_input:

Input
~~~~~
.. onedal_class:: oneapi::dal::kmeans_init::compute_input

.. _kmeans_init_c_api_result:

Result
~~~~~~
.. onedal_class:: oneapi::dal::kmeans_init::compute_result

.. _kmeans_init_c_api:

Operation
~~~~~~~~~

.. function:: template <typename Descriptor> \
              kmeans_init::compute_result compute(const Descriptor& desc, \
                                         const kmeans_init::compute_input& input)

   :param desc: K-Means algorithm descriptor :expr:`kmeans_init::descriptor`
   :param input: Input data for the computing operation

   Preconditions
      | :expr:`input.data.has_data == true`
      | :expr:`input.data.row_count == desc.cluster_count`
   Postconditions
      | :expr:`result.centroids.has_data == true`
      | :expr:`result.centroids.row_count == desc.cluster_count`
      | :expr:`result.centroids.column_count == input.data.column_count`


-------------
Usage Example
-------------

.. include:: ../../../includes/clustering/kmeans-init-usage-examples.rst

--------
Examples
--------

.. include:: ../../../includes/clustering/kmeans-init-examples.rst