GetMeanMaxMinTmpSize

Function Description

To perform Mean 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. The maximum temporary space of this API is currently equal to the minimum temporary space.

Prototype

void GetMeanMaxMinTmpSize(const uint32_t n, const uint32_t srcTypeSize,  const uint32_t accTypeSize, const bool isReuseSource, uint32_t &maxSize, uint32_t &minSize)

Parameters

**Table 1** API parameters
API	Input/Output	Function
n	Input	Number of actually computed elements in each row of the input.
srcTypeSize	Input	Type size of an operator input. The unit is byte. For example, if the data type of operator inputs is half, set this parameter to 2.
accTypeSize	Input	Size of the accType data type, in bytes. For details about the accType parameter, see the Mean API parameters.
isReuseSource	Input	Whether to reuse the space of the source operand input, which must be the same as that of the Mean API. This parameter is reserved.
maxSize	Output	Maximum size of the temporary space required by Mean computation. Any space exceeding this value will not be utilized by the API. 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.
minSize	Output	Minimum size of the temporary space required by Mean 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.

Returns

None

Availability

Example

// The data type of the operator input T is half, accType is float, and the default value false is passed for isReuseSource.
uint32_t n = 3;
uint32_t srcTypeSize = 2;
uint32_t accTypeSize = 4;
uint32_t maxValue = 0;
uint32_t minValue = 0;
AscendC::GetMeanMaxMinTmpSize(n, srcTypeSize, accTypeSize, false, maxValue, minValue);

Parent topic: Mean