Documentation

GetAscendDequantMaxMinTmpSize

Function Description

To perform AsendDequant 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 between the minimum and maximum, as the temporary space increases, the API computing 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

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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 operator input srcTensor. The unit is byte. For example, if the data type of operator inputs 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. 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 available 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 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

Availability

Example

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// The input shape is (2, 1024).
// m = 2, n = 1024 in dequantParams passed to AsendDequant. 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);