.. index:: pair: struct; dnnl::lrn_backward::desc
.. _doxid-structdnnl_1_1lrn__backward_1_1desc:

struct dnnl::lrn_backward::desc
===============================

.. toctree::
	:hidden:

Overview
~~~~~~~~

Descriptor for an LRN backward propagation primitive. :ref:`More...<details-structdnnl_1_1lrn__backward_1_1desc>`


.. ref-code-block:: cpp
	:class: doxyrest-overview-code-block

	#include <dnnl.hpp>
	
	struct desc
	{
		// fields
	
		:ref:`dnnl_lrn_desc_t<doxid-structdnnl__lrn__desc__t>` :target:`data<doxid-structdnnl_1_1lrn__backward_1_1desc_1a95c2713ddc2542f2d7ba108efa0f3bc9>`;

		// construction
	
		:ref:`desc<doxid-structdnnl_1_1lrn__backward_1_1desc_1a59aa96046c2bf2bc8c74ded21df266d7>`(
			:ref:`algorithm<doxid-group__dnnl__api__attributes_1ga00377dd4982333e42e8ae1d09a309640>` aalgorithm,
			const :ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>`& data_desc,
			const :ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>`& diff_data_desc,
			:ref:`memory::dim<doxid-structdnnl_1_1memory_1a6ad818e4699872cc913474fa5f122cd5>` local_size,
			float alpha,
			float beta,
			float k = 1.f
			);
	};
.. _details-structdnnl_1_1lrn__backward_1_1desc:

Detailed Documentation
~~~~~~~~~~~~~~~~~~~~~~

Descriptor for an LRN backward propagation primitive.

Construction
------------

.. index:: pair: function; desc
.. _doxid-structdnnl_1_1lrn__backward_1_1desc_1a59aa96046c2bf2bc8c74ded21df266d7:

.. ref-code-block:: cpp
	:class: doxyrest-title-code-block

	desc(
		:ref:`algorithm<doxid-group__dnnl__api__attributes_1ga00377dd4982333e42e8ae1d09a309640>` aalgorithm,
		const :ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>`& data_desc,
		const :ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>`& diff_data_desc,
		:ref:`memory::dim<doxid-structdnnl_1_1memory_1a6ad818e4699872cc913474fa5f122cd5>` local_size,
		float alpha,
		float beta,
		float k = 1.f
		)

Constructs a descriptor for an LRN backward propagation primitive.



.. rubric:: Parameters:

.. list-table::
	:widths: 20 80

	*
		- aalgorithm

		- LRN algorithm kind: either :ref:`dnnl::algorithm::lrn_across_channels <doxid-group__dnnl__api__attributes_1gga00377dd4982333e42e8ae1d09a309640ab9e2d858b551792385a4b5b86672b24b>`, or :ref:`dnnl::algorithm::lrn_within_channel <doxid-group__dnnl__api__attributes_1gga00377dd4982333e42e8ae1d09a309640aa25c4ccc5c7c9bd3a977a2089189a494>`.

	*
		- diff_data_desc

		- Diff source and diff destination memory descriptor.

	*
		- data_desc

		- Source memory descriptor.

	*
		- local_size

		- Regularization local size.

	*
		- alpha

		- The alpha regularization parameter.

	*
		- beta

		- The beta regularization parameter.

	*
		- k

		- The k regularization parameter.