AddDeqRelu

Applicability

Product	Supported
Atlas A3 training products / Atlas A3 inference products	√
Atlas A2 training products / Atlas A2 inference products	√
Atlas 200I/500 A2 inference products	x
Atlas inference product 's AI Core	√
Atlas inference product 's Vector Core	x
Atlas training products	x

Function

Adds inputs element-wise, performs Deq quantization on the result, and then performs ReLU calculation on the result (obtains the larger between the result and 0). The formula is as follows:

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The formula for calculating Deq is as follows:

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In the formula above, dividing by 2¹⁷ and then multiplying by 2¹⁷ prevents overflow caused by multiplying x by DeqScale. DeqScale must be set via SetDeqScale. For details, see SetDeqScale.

Prototype

Computation of the first n data elements of a tensor

        
             __aicore__ inline void AddDeqRelu(const LocalTensor<half>& dst, const LocalTensor<int32_t>& src0, const LocalTensor<int32_t>& src1, const int32_t& count)

High-dimensional tensor sharding computation

Bitwise mask mode

          
               template <bool isSetMask = true>
__aicore__ inline void AddDeqRelu(const LocalTensor<half>& dst, const LocalTensor<int32_t>& src0, const LocalTensor<int32_t>& src1, uint64_t mask[], const uint8_t repeatTime, const BinaryRepeatParams& repeatParams)

Contiguous mask mode

          
               template <bool isSetMask = true>
__aicore__ inline void AddDeqRelu(const LocalTensor<half>& dst, const LocalTensor<int32_t>& src0, const LocalTensor<int32_t>& src1, uint64_t mask, const uint8_t repeatTime, const BinaryRepeatParams& repeatParams)

When the operand is of the TensorTrait type, the template parameter is required for the LocalTensor. The following APIs are provided to support the input of operand data types as template parameters:

Computation of the first n data elements of a tensor

         
              template <typename T, typename U>
__aicore__ inline void AddDeqRelu(const LocalTensor<T>& dst, const LocalTensor<U>& src0, const LocalTensor<U>& src1, const int32_t& count)

High-dimensional tensor sharding computation

Bitwise mask mode

           
                template <typename T, typename U, bool isSetMask = true>
__aicore__ inline void AddDeqRelu(const LocalTensor<T>& dst, const LocalTensor<U>& src0, const LocalTensor<U>& src1, uint64_t mask[], const uint8_t repeatTime, const BinaryRepeatParams& repeatParams)

Contiguous mask mode

           
                template <typename T, typename U, bool isSetMask = true>
__aicore__ inline void AddDeqRelu(const LocalTensor<T>& dst, const LocalTensor<U>& src0, const LocalTensor<U>& src1, uint64_t mask, const uint8_t repeatTime, const BinaryRepeatParams& repeatParams)

Parameters

**Table 1** Template parameters
Parameter	Description
isSetMask	Indicates whether to set mask inside the API. true: sets mask inside the API. false: sets mask outside the API. Developers need to use the SetVectorMask API to set the mask value. In this mode, the mask value in the input parameter of this API must be set to the placeholder MASK_PLACEHOLDER.
T	Data type of the destination operand. For the Atlas A3 training products / Atlas A3 inference products , the supported data type is half. For the Atlas A2 training products / Atlas A2 inference products , the supported data type is half. For the Atlas inference product 's AI Core, the supported data type is half.
U	Data type of the source operand. For the Atlas A3 training products / Atlas A3 inference products , the supported data type is int32_t. For the Atlas A2 training products / Atlas A2 inference products , the supported data type is int32_t. For the Atlas inference product 's AI Core, the supported data type is int32_t.

**Table 2** Parameters
Parameter	Input/Output	Description
dst	Output	Destination operand. The type is LocalTensor, and the supported TPosition is VECIN, VECCALC, or VECOUT. The start address of the LocalTensor must be 32-byte aligned.
src0 and src1	Input	Source operand. The type is LocalTensor, and the supported TPosition is VECIN, VECCALC, or VECOUT. The start address of the LocalTensor must be 32-byte aligned.
count	Input	Number of elements involved in the computation.
mask[]/mask	Input	mask is used to control the elements that participate in computation in each iteration. Bitwise mode: controls which elements are involved in computation bit by bit. A bit value of 1 means the corresponding element participates in computation, while 0 means it does not. The mask value is an array. The array length and the value range of the array elements are related to the operand data type. When the operand is 16-bit, the array length is 2, mask[0] and mask[1] ∈ [0, 2⁶⁴ -1] and cannot be 0 at the same time. When the operand is 32-bit, the array length is 1 and mask[0] ∈ (0, 2⁶⁴ – 1]. When the operand is 64-bit, the array length is 1 and mask[0] ∈ (0, 2³² – 1]. For example, if mask = [0, 8] and 8 = 0b1000, only the fourth element participates in computation. Contiguous mode: indicates the number of contiguous elements that participate in computation. The value range is related to the operand data type. The maximum number of elements that can be processed in each repeat varies according to the data type. When the operand is 16-bit, mask ∈ [1, 128]. When the operand is 32-bit, mask ∈ [1, 64]. When the operand is 64-bit, mask ∈ [1, 32]. When the number of bits of the source operand is different from that of the destination operand, the data type with more bytes is used for the computation.
repeatTime	Input	Number of repeat iterations. The vector compute unit reads 256 bytes of contiguous data for computation each time. To process the input data, the data needs to be read and computed over multiple repeats. repeatTime indicates the number of repeats. For details about this parameter, see High-dimensional Sharding APIs.
repeatParams	Input	Parameters that control the operand address strides. They are of the BinaryRepeatParams type, and contain such parameters as those that specify the address stride of the operand for the same data block between adjacent iterations and address stride of the operand between different data blocks in a single iteration. For details about the address stride of the operand between adjacent iterations, see repeatStride. For details about the address stride of the operand between different data blocks in a single iteration, see dataBlockStride.

Returns

None

Restrictions

For details about the operand address alignment requirements, see General Address Alignment Restrictions.
Address overlapping between the destination and source operands is not supported.

Example

In this example, srcLocal is of type int32_t and dstLocal is of type half. The mask is calculated based on the int32_t type.

Example of high-dimensional tensor sharding computation (contiguous mask mode)

        
             uint64_t mask = 256 / sizeof(int32_t); // 64
// repeatTime = 4. 64 elements are computed in one iteration, and 256 elements are computed in total.
// dstBlkStride, src0BlkStride, src1BlkStride = 1. Data is continuously read and written in a single iteration.
// dstRepStride = 4, src0RepStride, src1RepStride = 8. Data is read and written continuously between adjacent repeats.
half scale = 0.1;
AscendC::SetDeqScale(scale);
AscendC::AddDeqRelu(dstLocal, src0Local, src1Local, mask, 4, { 1, 1, 1, 4, 8, 8 });

Example of high-dimensional tensor sharding computation (bitwise mask mode)

        
             uint64_t mask[2] = { UINT64_MAX, UINT64_MAX };
// repeatTime = 4. 64 elements are computed in one iteration, and 256 elements are computed in total.
// dstBlkStride, src0BlkStride, src1BlkStride = 1. Data is continuously read and written in a single iteration.
// dstRepStride = 4, src0RepStride, src1RepStride = 8. Data is read and written continuously between adjacent repeats.
half scale = 0.1;
AscendC::SetDeqScale(scale);
AscendC::AddDeqRelu(dstLocal, src0Local, src1Local, mask, 4, { 1, 1, 1, 4, 8, 8 });

Example of computing the first n data elements of a tensor

        
             half scale = 0.1;
AscendC::SetDeqScale(scale);
AscendC::AddDeqRelu(dstLocal, src0Local, src1Local, 512);

Result example:

Input (src0Local): [70 36 43 54 28 49 27 82 95 ...]
Input (src1Local): [19 33 34 50 42  2 97 93 99 ...]
Output (dstLocal): [8.9 6.9 7.7 10.4 7.0 5.1 12.4 17.5 19.4 ...]

Parent topic: Compound Computation