DML_MATRIX_MULTIPLY_INTEGER_TO_FLOAT_OPERATOR_DESC structure (directml.h)

Performs a matrix multiplication function on integer input tensor data, and produces floating point output.

This operator requires the matrix multiply input tensors to be 4D, which are formatted as { BatchCount, ChannelCount, Height, Width }. The matrix multiply operator will perform BatchCount * ChannelCount number of independent matrix multiplications.

For example, if ATensor has Sizes of { BatchCount, ChannelCount, M, K }, and BTensor has Sizes of { BatchCount, ChannelCount, K, N }, and OutputTensor has Sizes of { BatchCount, ChannelCount, M, N }, then the matrix multiply operator will perform BatchCount * ChannelCount independent matrix multiplications of dimensions {M,K} x {K,N} = {M,N}.

Important

This API is available as part of the DirectML standalone redistributable package (see Microsoft.AI.DirectML version 1.13 and later. Also see DirectML version history.

Syntax

struct DML_MATRIX_MULTIPLY_INTEGER_TO_FLOAT_OPERATOR_DESC
{
    const DML_TENSOR_DESC* ATensor;
    const DML_TENSOR_DESC* AScaleTensor;
    _Maybenull_ const DML_TENSOR_DESC* AZeroPointTensor;
    const DML_TENSOR_DESC* BTensor;
    const DML_TENSOR_DESC* BScaleTensor;
    _Maybenull_ const DML_TENSOR_DESC* BZeroPointTensor;
    _Maybenull_ const DML_TENSOR_DESC* BiasTensor;
    const DML_TENSOR_DESC* OutputTensor;
};

Members

ATensor

Type: const DML_TENSOR_DESC*

A tensor containing the A data. This tensor's dimensions should be { BatchCount, ChannelCount, M, K }.

AScaleTensor

Type: const DML_TENSOR_DESC*

A tensor containing the ATensor scale data. The expected dimensions of AScaleTensor are { 1, 1, 1, 1 } if per-tensor quantization is required, or { 1, 1, M, 1 } if per-row quantization is required. These scale values are used for dequantizing the ATensor values.

AZeroPointTensor

Type: _Maybenull_ const DML_TENSOR_DESC*

An optional tensor containing the ATensor zero point data. The expected dimensions of AZeroPointTensor are { 1, 1, 1, 1 } if per-tensor quantization is required, or { 1, 1, M, 1 } if per-row quantization is required. These zero point values are used for dequantizing the ATensor values.

BTensor

Type: const DML_TENSOR_DESC*

A tensor containing the B data. This tensor's dimensions should be { BatchCount, ChannelCount, K, N }.

BScaleTensor

Type: const DML_TENSOR_DESC*

A tensor containing the BTensor scale data. The expected dimensions of BScaleTensor are { 1, 1, 1, 1 } if per-tensor quantization is required, or { 1, 1, 1, N } if per-column quantization is required. These scale values are used for dequantizing the BTensor values.

BZeroPointTensor

Type: _Maybenull_ const DML_TENSOR_DESC*

An optional tensor containing the BTensor zero point data. The expected dimensions of BZeroPointTensor are { 1, 1, 1, 1 } if per-tensor quantization is required, or { 1, 1, 1, N } if per-column quantization is required. These zero point values are used for dequantizing the BTensor values.

OutputScaleTensor

Type: const DML_TENSOR_DESC*

A tensor containing the OutputTensor scale data. The expected dimensions of OutputScaleTensor are { 1, 1, 1, 1 } if per-tensor quantization is required, or { 1, 1, M, 1 } if per-row quantization is required. This scale value is used for dequantizing the OutputTensor values.

OutputZeroPointTensor

Type: _Maybenull_ const DML_TENSOR_DESC*

An optional tensor containing the OutputTensor zero point data. The expected dimensions of OutputZeroPointTensor are { 1, 1, 1, 1 } if per-tensor quantization is required, or { 1, 1, M, 1 } if per-row quantization is required. This zero point value is used for dequantizing the OutputTensor values.

BiasTensor

Type: _Maybenull_ const DML_TENSOR_DESC*

An optional tensor containing the bias data. If provided, this tensor's Sizes should match output size { BatchCount, ChannelCount, M, N }.

OutputTensor

Type: const DML_TENSOR_DESC*

A tensor with which to write the results to. This tensor's dimensions are { BatchCount, ChannelCount, M, N }.

Availability

This operator was introduced in DML_FEATURE_LEVEL_6_2.

Tensor constraints

• AScaleTensor, AZeroPointTensor, BScaleTensor, and BZeroPointTensor must have the same DimensionCount.
• ATensor, BiasTensor, BTensor, and OutputTensor must have the same DimensionCount.
• BiasTensor and OutputTensor must have the same Sizes.
• ATensor, AZeroPointTensor, BTensor, and BZeroPointTensor must have the same DataType.
• AScaleTensor, BiasTensor, BScaleTensor, and OutputTensor must have the same DataType.

Tensor support

Tensor	Kind	Dimensions	Supported dimension counts	Supported data types
ATensor	Input	{ [BatchCount], [ChannelCount], M, K }	2 to 4	INT32, INT16, INT8, UINT32, UINT16, UINT8
AScaleTensor	Input	{ AScaleDimensions[] }	1 to 4	FLOAT32, FLOAT16
AZeroPointTensor	Optional input	{ [1], [1], AZeroPointCount, [1] }	1 to 4	INT32, INT16, INT8, UINT32, UINT16, UINT8
BTensor	Input	{ [BatchCount], [ChannelCount], K, N }	2 to 4	INT32, INT16, INT8, UINT32, UINT16, UINT8
BScaleTensor	Input	{ BScaleDimensions[] }	1 to 4	FLOAT32, FLOAT16
BZeroPointTensor	Optional input	{ [1], [1], [1], BZeroPointCount }	1 to 4	INT32, INT16, INT8, UINT32, UINT16, UINT8
BiasTensor	Optional input	{ [BatchCount], [ChannelCount], M, N }	2 to 4	FLOAT32, FLOAT16
OutputTensor	Output	{ [BatchCount], [ChannelCount], M, N }	2 to 4	FLOAT32, FLOAT16

Requirements

Header	directml.h