GetDequantizeMaxMinTmpSize

Function Usage

To perform Dequantize computation in the kernel, developers need to reserve or allocate the temporary space. This API is used to obtain the maximum and minimum sizes of the temporary space to be reserved or allocated on the host. Developers can select a proper size within this range as the tiling parameter and pass it to the kernel.

To ensure correct functions, the temporary space to be reserved or allocated cannot be less than the minimum temporary space.
Within the range from the minimum to the maximum, as the temporary space increases, the API compute performance in the kernel can be optimized to some extent. To achieve better performance, reserve or allocate the space based on the actual buffer usage.

Prototype

void GetDequantizeMaxMinTmpSize(const ge::Shape& srcShape, const uint32_t typeSize, uint32_t& maxValue, uint32_t& minValue)

Parameters

**Table 1** API parameters
Parameter	Input/Output	Description
srcShape	Input	Shape information of the input srcTensor of the Dequantize API.
typeSize	Input	Data type size of the input srcTensor of the Dequantize API, in bytes. For example, if the input data type is int32_t, set this parameter to 4.
maxValue	Output	Maximum size of the temporary space required by Dequantize computation. Any space exceeding this value will not be utilized by the API. Within the range from the minimum to the maximum, as the temporary space increases, the API compute performance in the kernel can be optimized to some extent. To achieve better performance, reserve or allocate the space based on the actual buffer usage. If the maximum space size is 0, no temporary space is required. NOTE: maxValue is for reference only and may be larger than the remaining space of the Unified Buffer. In this case, select a proper temporary space size based on the remaining space of the Unified Buffer.
minValue	Output	Minimum size of the temporary space required by Dequantize computation. To ensure correct functions, the size of the temporary space to be reserved or allocated during API computation cannot be less than the value of this parameter. If the minimum space size is 0, no temporary space is required.

Returns

None

Constraints

None

Examples

// The input shape is (2, 1024).
// m = 2, n = 1024 in DequantizeParams passed to Dequantize. The input data type is int32_t.
std::vector<int64_t> shapeVec = {2, 1024};
ge::Shape srcShape(shapeVec);
uint32_t typeSize = 4;
uint32_t maxValue = 0;
uint32_t minValue = 0;
AscendC::GetDequantizeMaxMinTmpSize(srcShape, typeSize, maxValue, minValue);

Parent topic: Quantization