Inner Product

Intel® oneAPI Deep Neural Network Developer Guide and Reference

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ID 768875

Date 6/30/2025

Version

Public

Visible to Intel only — GUID: GUID-8D700A61-8945-4F30-9B61-A865507D48EC

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Inner Product

Overview

A primitive to compute an inner product. More…

// structs

struct dnnl::inner_product_backward_data;
struct dnnl::inner_product_backward_weights;
struct dnnl::inner_product_forward;

// global functions

dnnl_status_t DNNL_API dnnl_inner_product_forward_primitive_desc_create(
    dnnl_primitive_desc_t* primitive_desc,
    dnnl_engine_t engine,
    dnnl_prop_kind_t prop_kind,
    const_dnnl_memory_desc_t src_desc,
    const_dnnl_memory_desc_t weights_desc,
    const_dnnl_memory_desc_t bias_desc,
    const_dnnl_memory_desc_t dst_desc,
    const_dnnl_primitive_attr_t attr
    );

dnnl_status_t DNNL_API dnnl_inner_product_backward_data_primitive_desc_create(
    dnnl_primitive_desc_t* primitive_desc,
    dnnl_engine_t engine,
    const_dnnl_memory_desc_t diff_src_desc,
    const_dnnl_memory_desc_t weights_desc,
    const_dnnl_memory_desc_t diff_dst_desc,
    const_dnnl_primitive_desc_t hint_fwd_pd,
    const_dnnl_primitive_attr_t attr
    );

dnnl_status_t DNNL_API dnnl_inner_product_backward_weights_primitive_desc_create(
    dnnl_primitive_desc_t* primitive_desc,
    dnnl_engine_t engine,
    const_dnnl_memory_desc_t src_desc,
    const_dnnl_memory_desc_t diff_weights_desc,
    const_dnnl_memory_desc_t diff_bias_desc,
    const_dnnl_memory_desc_t diff_dst_desc,
    const_dnnl_primitive_desc_t hint_fwd_pd,
    const_dnnl_primitive_attr_t attr
    );

Detailed Documentation

A primitive to compute an inner product.

See also:

Inner Product in developer guide

Global Functions

dnnl_status_t DNNL_API dnnl_inner_product_forward_primitive_desc_create(
    dnnl_primitive_desc_t* primitive_desc,
    dnnl_engine_t engine,
    dnnl_prop_kind_t prop_kind,
    const_dnnl_memory_desc_t src_desc,
    const_dnnl_memory_desc_t weights_desc,
    const_dnnl_memory_desc_t bias_desc,
    const_dnnl_memory_desc_t dst_desc,
    const_dnnl_primitive_attr_t attr
    )

Creates a primitive descriptor for an inner product forward propagation primitive.

NOTE:

Memory descriptors can be initialized with dnnl_format_tag_any or with format_kind set to dnnl_format_kind_any.

Parameters:

primitive_desc	Output primitive_descriptor.
engine	Engine to use.
prop_kind	Propagation kind. Possible values are dnnl_forward_training and dnnl_forward_inference.
src_desc	Source memory descriptor.
weights_desc	Weights memory descriptor.
bias_desc	Bias memory descriptor. Passing NULL, a zero memory descriptor, or a memory descriptor with format_kind set to dnnl_format_kind_undef disables the bias term.
dst_desc	Destination memory descriptor.
attr	Primitive attributes (can be NULL).

Returns:

dnnl_success on success and a status describing the error otherwise.

dnnl_status_t DNNL_API dnnl_inner_product_backward_data_primitive_desc_create(
    dnnl_primitive_desc_t* primitive_desc,
    dnnl_engine_t engine,
    const_dnnl_memory_desc_t diff_src_desc,
    const_dnnl_memory_desc_t weights_desc,
    const_dnnl_memory_desc_t diff_dst_desc,
    const_dnnl_primitive_desc_t hint_fwd_pd,
    const_dnnl_primitive_attr_t attr
    )

Creates a primitive descriptor for an inner product backward propagation primitive.

NOTE:

Memory descriptors can be initialized with dnnl_format_tag_any or with format_kind set to dnnl_format_kind_any.

Parameters:

primitive_desc	Output primitive_descriptor.
engine	Engine to use.
diff_src_desc	Diff source memory descriptor.
weights_desc	Weights memory descriptor.
diff_dst_desc	Diff destination memory descriptor.
hint_fwd_pd	Primitive descriptor for a respective forward propagation primitive.
attr	Primitive attributes (can be NULL).

Returns:

dnnl_success on success and a status describing the error otherwise.

dnnl_status_t DNNL_API dnnl_inner_product_backward_weights_primitive_desc_create(
    dnnl_primitive_desc_t* primitive_desc,
    dnnl_engine_t engine,
    const_dnnl_memory_desc_t src_desc,
    const_dnnl_memory_desc_t diff_weights_desc,
    const_dnnl_memory_desc_t diff_bias_desc,
    const_dnnl_memory_desc_t diff_dst_desc,
    const_dnnl_primitive_desc_t hint_fwd_pd,
    const_dnnl_primitive_attr_t attr
    )

Creates a primitive descriptor for an inner product weights gradient primitive.

NOTE:

Memory descriptors can be initialized with dnnl_format_tag_any or with format_kind set to dnnl_format_kind_any.

Parameters:

primitive_desc	Output primitive_descriptor.
engine	Engine to use.
src_desc	Source memory descriptor.
diff_weights_desc	Diff weights memory descriptor.
diff_bias_desc	Diff bias memory descriptor. Passing NULL, a zero memory descriptor, or a memory descriptor with format_kind set to dnnl_format_kind_undef disables the bias term.
diff_dst_desc	Diff destination memory descriptor.
hint_fwd_pd	Primitive descriptor for a respective forward propagation primitive.
attr	Primitive attributes (can be NULL).

Returns:

dnnl_success on success and a status describing the error otherwise.

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Intel® oneAPI Deep Neural Network Developer Guide and Reference

Inner Product

Overview

Detailed Documentation