.. index:: pair: struct; dnnl::eltwise_backward::primitive_desc
.. _doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc:

struct dnnl::eltwise_backward::primitive_desc
=============================================

.. toctree::
	:hidden:

Overview
~~~~~~~~

Primitive descriptor for eltwise backward propagation. :ref:`More...<details-structdnnl_1_1eltwise__backward_1_1primitive__desc>`


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

	#include <dnnl.hpp>
	
	struct primitive_desc: public :ref:`dnnl::primitive_desc<doxid-structdnnl_1_1primitive__desc>`
	{
		// construction
	
		:ref:`primitive_desc<doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1a656a7d9aece3a8b0c0970b64579ce544>`();
	
		:ref:`primitive_desc<doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1a6820a9719f7aa3483e3e19443313d0ac>`(
			const :ref:`desc<doxid-structdnnl_1_1eltwise__backward_1_1desc>`& adesc,
			const :ref:`engine<doxid-structdnnl_1_1engine>`& aengine,
			const :ref:`eltwise_forward::primitive_desc<doxid-structdnnl_1_1eltwise__forward_1_1primitive__desc>`& hint_fwd_pd,
			bool allow_empty = false
			);
	
		:ref:`primitive_desc<doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1a6fbd45121a46fde56ff70462e75e4515>`(
			const :ref:`desc<doxid-structdnnl_1_1eltwise__backward_1_1desc>`& adesc,
			const primitive_attr& attr,
			const :ref:`engine<doxid-structdnnl_1_1engine>`& aengine,
			const :ref:`eltwise_forward::primitive_desc<doxid-structdnnl_1_1eltwise__forward_1_1primitive__desc>`& hint_fwd_pd,
			bool allow_empty = false
			);
	
		:ref:`primitive_desc<doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1aeadf274f41a2aeaafb63f5b0708d86e7>`(:ref:`dnnl_primitive_desc_t<doxid-group__dnnl__api__primitives__common_1gaabde3e27edf071b62b39f47bace7efd6>` pd);

		// methods
	
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`src_desc<doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1a8d78475cfeda855b23b0e9335aacacc1>`() const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`diff_src_desc<doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1a090cc653f9ea9b8186078b764d2ec033>`() const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`diff_dst_desc<doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1acaf67e02a1a65bd0f5480d98f520ec73>`() const;
	};

Inherited Members
-----------------

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

	public:
		// methods
	
		:ref:`handle<doxid-structdnnl_1_1handle>`<T, traits>& :ref:`operator =<doxid-structdnnl_1_1handle_1a4ad1ff54e4aafeb560a869c49aa20b52>` (const :ref:`handle<doxid-structdnnl_1_1handle>`<T, traits>&);
		:ref:`handle<doxid-structdnnl_1_1handle>`<T, traits>& :ref:`operator =<doxid-structdnnl_1_1handle_1af3f85524f3d83abdd4917b46ce23e727>` (:ref:`handle<doxid-structdnnl_1_1handle>`<T, traits>&&);
		void :ref:`reset<doxid-structdnnl_1_1handle_1a8862ef3d31c3b19bd88395e0b1373909>`(T t, bool weak = false);
		T :ref:`get<doxid-structdnnl_1_1handle_1a2208243e1d147a0be9da87fff46ced7e>`(bool allow_empty = false) const;
		:ref:`operator T<doxid-structdnnl_1_1handle_1a498e45a0937a32367b400b09dbc3dac3>` () const;
		:ref:`operator bool<doxid-structdnnl_1_1handle_1ad14e2635ad97d873f0114ed77c1f55d5>` () const;
		bool :ref:`operator ==<doxid-structdnnl_1_1handle_1a069b5ea2a2c13fc4ebefd4fb51d0899e>` (const :ref:`handle<doxid-structdnnl_1_1handle>`<T, traits>& other) const;
		bool :ref:`operator !=<doxid-structdnnl_1_1handle_1a1895f4cd3fc3eca7560756c0c508e5ab>` (const :ref:`handle<doxid-structdnnl_1_1handle>`& other) const;
		:ref:`engine<doxid-structdnnl_1_1engine>` :ref:`get_engine<doxid-structdnnl_1_1primitive__desc__base_1a32f7477c79e715a341bb9127df521fbc>`() const;
		const char* :ref:`impl_info_str<doxid-structdnnl_1_1primitive__desc__base_1ae680492d4e4b16a938cfc051e5c906be>`() const;
		:ref:`memory::dim<doxid-structdnnl_1_1memory_1a6ad818e4699872cc913474fa5f122cd5>` :ref:`query_s64<doxid-structdnnl_1_1primitive__desc__base_1acbedc4257eaa26f868356f9f594a856a>`(:ref:`query<doxid-group__dnnl__api__primitives__common_1ga94efdd650364f4d9776cfb9b711cbdc1>` what) const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`query_md<doxid-structdnnl_1_1primitive__desc__base_1a35d24b553ba6aa807516e9470fdd7d16>`(:ref:`query<doxid-group__dnnl__api__primitives__common_1ga94efdd650364f4d9776cfb9b711cbdc1>` what, int idx = 0) const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`src_desc<doxid-structdnnl_1_1primitive__desc__base_1af42e791f493e636c086e13c6d4c06b43>`(int idx) const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`dst_desc<doxid-structdnnl_1_1primitive__desc__base_1a495ee7c8e1ec3eab35f6329fdcd352bb>`(int idx) const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`weights_desc<doxid-structdnnl_1_1primitive__desc__base_1acb13d08987cca8d8f05ec4858fa61fb4>`(int idx) const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`diff_src_desc<doxid-structdnnl_1_1primitive__desc__base_1a733e6ff4e78a758e69ae6232e8955871>`(int idx) const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`diff_dst_desc<doxid-structdnnl_1_1primitive__desc__base_1a60f17d04c493c42e4a50ad5feff5c8ca>`(int idx) const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`diff_weights_desc<doxid-structdnnl_1_1primitive__desc__base_1a192f7b334efac9a5ac20344a76d4d552>`(int idx) const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`src_desc<doxid-structdnnl_1_1primitive__desc__base_1af48dcff294cadb2916fd784b8474d221>`() const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`dst_desc<doxid-structdnnl_1_1primitive__desc__base_1addbec977643a7900f4156f7aab3fb4db>`() const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`weights_desc<doxid-structdnnl_1_1primitive__desc__base_1a93f0904566b399874c47b3b1ad3d1495>`() const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`diff_src_desc<doxid-structdnnl_1_1primitive__desc__base_1ab4268c6bb70dd6c22de43141cc301b77>`() const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`diff_dst_desc<doxid-structdnnl_1_1primitive__desc__base_1a6b9fb7da987329256c04db6ecbb9dc36>`() const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`diff_weights_desc<doxid-structdnnl_1_1primitive__desc__base_1af51378982968e2b4f7abb6a32acfb0af>`() const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`workspace_desc<doxid-structdnnl_1_1primitive__desc__base_1ad26f416a149cb44cc5cfc130012c614e>`() const;
		:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` :ref:`scratchpad_desc<doxid-structdnnl_1_1primitive__desc__base_1a6238358ec03afd57fb20dffa65b48d2f>`() const;
		:ref:`engine<doxid-structdnnl_1_1engine>` :ref:`scratchpad_engine<doxid-structdnnl_1_1primitive__desc__base_1ad4079e0891373bd2dc841f3f94cf47ed>`() const;
		primitive_attr :ref:`get_primitive_attr<doxid-structdnnl_1_1primitive__desc__base_1a0ef600ea3666f0fd93c9c5d112aaf05c>`() const;
		:ref:`dnnl::primitive::kind<doxid-structdnnl_1_1primitive_1ad1ec93215a0cf3aa0a32bae0c2cd9169>` :ref:`get_kind<doxid-structdnnl_1_1primitive__desc__base_1a663f3511855bfc2625476019321c909d>`() const;
		bool :ref:`next_impl<doxid-structdnnl_1_1primitive__desc_1a841df469ca54c3de2d233e46f48322b2>`();
		:ref:`primitive_desc_base<doxid-structdnnl_1_1primitive__desc_1a27780142d0880bb0ca678f7c5a1845b9>`();
		:ref:`primitive_desc_base<doxid-structdnnl_1_1primitive__desc_1aae07f2f06d74537546c3056bd305dfbe>`();
		:ref:`primitive_desc_base<doxid-structdnnl_1_1primitive__desc_1af4eac2eea0fd4eb37c0c90ead14ad52b>`();
		:ref:`primitive_desc_base<doxid-structdnnl_1_1primitive__desc_1aa4853f3190cac45b653e510b6eeed97a>`();

.. _details-structdnnl_1_1eltwise__backward_1_1primitive__desc:

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

Primitive descriptor for eltwise backward propagation.

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

.. index:: pair: function; primitive_desc
.. _doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1a656a7d9aece3a8b0c0970b64579ce544:

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

	primitive_desc()

Default constructor. Produces an empty object.

.. index:: pair: function; primitive_desc
.. _doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1a6820a9719f7aa3483e3e19443313d0ac:

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

	primitive_desc(
		const :ref:`desc<doxid-structdnnl_1_1eltwise__backward_1_1desc>`& adesc,
		const :ref:`engine<doxid-structdnnl_1_1engine>`& aengine,
		const :ref:`eltwise_forward::primitive_desc<doxid-structdnnl_1_1eltwise__forward_1_1primitive__desc>`& hint_fwd_pd,
		bool allow_empty = false
		)

Constructs a primitive descriptor for an elementwise backward propagation primitive.



.. rubric:: Parameters:

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

	*
		- adesc

		- Descriptor for an elementwise backward propagation primitive.

	*
		- aengine

		- Engine to use.

	*
		- hint_fwd_pd

		- Primitive descriptor for an elementwise forward propagation primitive. It is used as a hint for deciding which memory format to use.

	*
		- allow_empty

		- A flag signifying whether construction is allowed to fail without throwing an exception. In this case an empty object will be produced. This flag is optional and defaults to false.

.. index:: pair: function; primitive_desc
.. _doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1a6fbd45121a46fde56ff70462e75e4515:

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

	primitive_desc(
		const :ref:`desc<doxid-structdnnl_1_1eltwise__backward_1_1desc>`& adesc,
		const primitive_attr& attr,
		const :ref:`engine<doxid-structdnnl_1_1engine>`& aengine,
		const :ref:`eltwise_forward::primitive_desc<doxid-structdnnl_1_1eltwise__forward_1_1primitive__desc>`& hint_fwd_pd,
		bool allow_empty = false
		)

Constructs a primitive descriptor for an elementwise backward propagation primitive.



.. rubric:: Parameters:

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

	*
		- adesc

		- Descriptor for an elementwise backward propagation primitive.

	*
		- attr

		- Primitive attributes to use.

	*
		- aengine

		- Engine to use.

	*
		- hint_fwd_pd

		- Primitive descriptor for an elementwise forward propagation primitive. It is used as a hint for deciding which memory format to use.

	*
		- allow_empty

		- A flag signifying whether construction is allowed to fail without throwing an exception. In this case an empty object will be produced. This flag is optional and defaults to false.

.. index:: pair: function; primitive_desc
.. _doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1aeadf274f41a2aeaafb63f5b0708d86e7:

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

	primitive_desc(:ref:`dnnl_primitive_desc_t<doxid-group__dnnl__api__primitives__common_1gaabde3e27edf071b62b39f47bace7efd6>` pd)

Constructs a primitive descriptor for an eltwise backward propagation primitive from a C API primitive descriptor that must have a matching kind.



.. rubric:: Parameters:

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

	*
		- pd

		- C API primitive descriptor for an eltwise backward propagation primitive.

Methods
-------

.. index:: pair: function; src_desc
.. _doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1a8d78475cfeda855b23b0e9335aacacc1:

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

	:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` src_desc() const

Returns a source memory descriptor.



.. rubric:: Returns:

Source memory descriptor.

A zero memory descriptor if the primitive does not have a source parameter.

.. index:: pair: function; diff_src_desc
.. _doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1a090cc653f9ea9b8186078b764d2ec033:

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

	:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` diff_src_desc() const

Returns a diff source memory descriptor.



.. rubric:: Returns:

Diff source memory descriptor.

A zero memory descriptor if the primitive does not have a diff source memory with.

.. index:: pair: function; diff_dst_desc
.. _doxid-structdnnl_1_1eltwise__backward_1_1primitive__desc_1acaf67e02a1a65bd0f5480d98f520ec73:

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

	:ref:`memory::desc<doxid-structdnnl_1_1memory_1_1desc>` diff_dst_desc() const

Returns a diff destination memory descriptor.



.. rubric:: Returns:

Diff destination memory descriptor.

A zero memory descriptor if the primitive does not have a diff destination parameter.