ActivationGrad

激活函数梯度计算算子系列。该系列算子根据激活函数的输入(或输出)以及上一层传回的梯度,计算并输出当前层的梯度。

其中 \(src0\) 为梯度输入(Output Gradient),\(src1\) 为激活函数的原始输入或输出(取决于具体激活函数类型)。各算子具体计算公式:

  • ReluGrad - ReLU 激活梯度:

    \[dst_i = (src1_i > 0) \cdot src0_i\]
  • Relu6Grad - ReLU6 激活梯度:

    \[dst_i = (0 < src1_i \leq 6) \cdot src0_i\]
  • LReluGrad - Leaky ReLU 激活梯度,参数 alpha

    \[dst_i = (src1_i > 0) \cdot src0_i + (src1_i \leq 0) \cdot \alpha \cdot src0_i\]
  • SigmoidGrad - Sigmoid 激活梯度:

    \[dst_i = src0_i \cdot src1_i \cdot (1 - src1_i)\]
  • TanhGrad - Tanh 激活梯度:

    \[dst_i = src0_i \cdot (1 - src1_i^2)\]
  • HSigmoidGrad - Hard Sigmoid 激活梯度:

    \[\begin{split}dst_i = src0_i \cdot \begin{cases} 0 & src1_i < -3 \\ 1/6 & -3 \leq src1_i \leq 3 \\ 0 & src1_i > 3 \end{cases}\end{split}\]
  • HSwishGrad - Hard Swish 激活梯度:

    \[\begin{split}dst_i = src0_i \cdot \begin{cases} 0 & src1_i < -3 \\ (2 \cdot src1_i + 3) / 6 & -3 \leq src1_i \leq 3 \\ 1 & src1_i > 3 \end{cases}\end{split}\]
  • GeluGrad - GELU 激活梯度:

    \[dst_i = src0_i \cdot \left( \frac{1}{2} \left(1 + \text{erf}\left(\frac{src1_i}{\sqrt{2}}\right)\right) + \frac{src1_i \cdot e^{-src1_i^2/2}}{\sqrt{2\pi}} \right)\]
  • EluGrad - ELU 激活梯度,参数 alpha

    \[dst_i = (src1_i > 0) \cdot src0_i + (src1_i \leq 0) \cdot \alpha \cdot e^{src1_i} \cdot src0_i\]
  • SoftplusGrad - Softplus 激活梯度:

    \[dst_i = \frac{src0_i}{1 + e^{-src1_i}}\]
  • HardshrinkGrad - Hard Shrink 激活梯度,参数 lambd

    \[\begin{split}dst_i = \begin{cases} 0 & -\lambda \leq src1_i \leq \lambda \\ src0_i & \text{otherwise} \end{cases}\end{split}\]
  • SoftshrinkGrad - Softshrink 激活梯度,参数 lambd

    \[\begin{split}dst_i = \begin{cases} 0 & -\lambda \leq src1_i \leq \lambda \\ src0_i & \text{otherwise} \end{cases}\end{split}\]
  • CeluGrad - CELU 激活梯度,参数 alpha

    \[dst_i = (src1_i > 0) \cdot src0_i + (src1_i \leq 0) \cdot src0_i \cdot e^{src1_i / \alpha}\]
  • HardtanhGrad - Hard Tanh 激活梯度,参数 min_valmax_val

    \[dst_i = (min\_val < src1_i \leq max\_val) \cdot src0_i\]
输入:
  • src0 - 梯度输入数据地址。

  • src1 - 原始输入/输出数据地址。

  • length - 计算长度。

  • alpha (float, 可选) - LReluGrad、EluGrad、CeluGrad 所需的系数。

  • lambd (float, 可选) - HardshrinkGrad、SoftshrinkGrad 所需的系数。

  • min_val / max_val (float, 可选) - HardtanhGrad 所需的边界值。

  • core_mask (int, 可选) - 核掩码(仅适用于共享存储版本)。

输出:
  • dst - 梯度计算结果输出地址。

支持平台:

FT78NE MT7004

备注

  • FT78NE 仅支持 fp32。

  • MT7004 支持 fp32, fp16。

  • 对于不同的算子,src1 的含义可能不同(例如 SigmoidGrad 通常使用前向传播的输出作为 src1,而 ReluGrad 使用前向传播的输入作为 src1),需确保上层传入地址正确。

共享存储版本:

void fp_relu_grad_s(float *src0, float *src1, float *dst, int length, int core_mask)
void hp_relu_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, int core_mask)
void fp_relu6_grad_s(float *src0, float *src1, float *dst, int length, int core_mask)
void hp_relu6_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, int core_mask)
void fp_lrelu_grad_s(float *src0, float *src1, float *dst, int length, float alpha, int core_mask)
void hp_lrelu_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, float16 alpha, int core_mask)
void fp_sigmoid_grad_s(float *src0, float *src1, float *dst, int length, int core_mask)
void hp_sigmoid_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, int core_mask)
void fp_tanh_grad_s(float *src0, float *src1, float *dst, int length, int core_mask)
void hp_tanh_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, int core_mask)
void fp_hsigmoid_grad_s(float *src0, float *src1, float *dst, int length, int core_mask)
void hp_hsigmoid_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, int core_mask)
void fp_hswish_grad_s(float *src0, float *src1, float *dst, int length, int core_mask)
void hp_hswish_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, int core_mask)
void fp_gelu_grad_s(float *src0, float *src1, float *dst, int length, int core_mask)
void hp_gelu_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, int core_mask)
void fp_elu_grad_s(float *src0, float *src1, float *dst, int length, float alpha, int core_mask)
void hp_elu_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, float16 alpha, int core_mask)
void fp_softplus_grad_s(float *src0, float *src1, float *dst, int length, int core_mask)
void hp_softplus_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, int core_mask)
void fp_hardshrink_grad_s(float *src0, float *src1, float *dst, int length, float lambd, int core_mask)
void hp_hardshrink_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, float16 lambd, int core_mask)
void fp_softshrink_grad_s(float *src0, float *src1, float *dst, int length, float lambd, int core_mask)
void hp_softshrink_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, float16 lambd, int core_mask)
void fp_celu_grad_s(float *src0, float *src1, float *dst, int length, float alpha, int core_mask)
void hp_celu_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, float16 alpha, int core_mask)
void fp_hardtanh_grad_s(float *src0, float *src1, float *dst, int length, float min_val, float max_val, int core_mask)
void hp_hardtanh_grad_s(float16 *src0, float16 *src1, float16 *dst, int length, float min_val, float max_val, int core_mask)

C调用示例:

 1//MT7004示例(共享存储)
 2#include <stdio.h>
 3
 4int main(int argc, char* argv[]) {
 5    float *src0 = (float *)0xA0000000;   // 梯度输入在共享存储
 6    float *src1 = (float *)0xA1000000;   // 原始数据在共享存储
 7    float *dst  = (float *)0xB0000000;   // 结果输出到共享存储
 8    int length = 1024;
 9    int core_mask = 0xff;
10    fp_relu_grad_s(src0, src1, dst, length, core_mask);
11    return 0;
12}

私有存储版本:

void fp_relu_grad_p(float *src0, float *src1, float *dst, int length)
void hp_relu_grad_p(float16 *src0, float16 *src1, float16 *dst, int length)
void fp_relu6_grad_p(float *src0, float *src1, float *dst, int length)
void hp_relu6_grad_p(float16 *src0, float16 *src1, float16 *dst, int length)
void fp_lrelu_grad_p(float *src0, float *src1, float *dst, int length, float alpha)
void hp_lrelu_grad_p(float16 *src0, float16 *src1, float16 *dst, int length, float16 alpha)
void fp_sigmoid_grad_p(float *src0, float *src1, float *dst, int length)
void hp_sigmoid_grad_p(float16 *src0, float16 *src1, float16 *dst, int length)
void fp_tanh_grad_p(float *src0, float *src1, float *dst, int length)
void hp_tanh_grad_p(float16 *src0, float16 *src1, float16 *dst, int length)
void fp_hsigmoid_grad_p(float *src0, float *src1, float *dst, int length)
void hp_hsigmoid_grad_p(float16 *src0, float16 *src1, float16 *dst, int length)
void fp_hswish_grad_p(float *src0, float *src1, float *dst, int length)
void hp_hswish_grad_p(float16 *src0, float16 *src1, float16 *dst, int length)
void fp_gelu_grad_p(float *src0, float *src1, float *dst, int length)
void hp_gelu_grad_p(float16 *src0, float16 *src1, float16 *dst, int length)
void fp_elu_grad_p(float *src0, float *src1, float *dst, int length, float alpha)
void hp_elu_grad_p(float16 *src0, float16 *src1, float16 *dst, int length, float16 alpha)
void fp_softplus_grad_p(float *src0, float *src1, float *dst, int length)
void hp_softplus_grad_p(float16 *src0, float16 *src1, float16 *dst, int length)
void fp_hardshrink_grad_p(float *src0, float *src1, float *dst, int length, float lambd)
void hp_hardshrink_grad_p(float16 *src0, float16 *src1, float16 *dst, int length, float16 lambd)
void fp_softshrink_grad_p(float *src0, float *src1, float *dst, int length, float lambd)
void hp_softshrink_grad_p(float16 *src0, float16 *src1, float16 *dst, int length, float16 lambd)
void fp_celu_grad_p(float *src0, float *src1, float *dst, int length, float alpha)
void hp_celu_grad_p(float16 *src0, float16 *src1, float16 *dst, int length, float16 alpha)
void fp_hardtanh_grad_p(float *src0, float *src1, float *dst, int length, float min_val, float max_val)
void hp_hardtanh_grad_p(float16 *src0, float16 *src1, float16 *dst, int length, float min_val, float max_val)

C调用示例:

 1//MT7004 示例
 2#include <stdio.h>
 3
 4int main(int argc, char* argv[]) {
 5    float *src0 = (float *)0x10000000;   // 私有存储空间地址
 6    float *src1 = (float *)0x10001000;
 7    float *dst  = (float *)0x10002000;
 8    int length = 1024;
 9    float alpha = 0.01f;
10    fp_lrelu_grad_p(src0, src1, dst, length, alpha);
11    return 0;
12}