GetAscendDequantMaxMinTmpSize

Function

To perform AscendDequant computation in the kernel, you need to reserve or allocate the temporary space. This API is used to obtain the maximum and minimum temporary space sizes to be reserved or allocated on the host. You can select proper sizes within this range as the tiling parameters and pass them 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 between the minimum and maximum, as the temporary space increases, the API computing performance in the kernel can be optimized to some extent. For better performance, reserve or allocate the temporary space based on the actual memory usage.

Prototype

void GetAscendDequantMaxMinTmpSize(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 of the input srcTensor.
typeSize	Input	Data type size of the srcTensor input, 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 AscendDequant computation. Any space exceeding this value will not be utilized by the API. Within the range between the minimum and maximum, as the temporary space increases, the API computing performance in the kernel can be optimized to some extent. For better performance, reserve or allocate the temporary space based on the actual memory 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 AscendDequant computation. To ensure correct functions, 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

Restrictions

None

Example

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

Parent topic: Quantization