SmoothL1Loss

计算平滑L1损失函数

\[\begin{split}\text{loss}(x_1, x_2) = \begin{cases} \frac{(x_1 - x_2)^2}{2\beta}, & \text{if } |x_1 - x_2| < \beta \\ |x_1 - x_2| - \frac{\beta}{2}, & \text{otherwise} \end{cases}\end{split}\]

其中 \(x_1\) 为预测值,\(x_2\) 为目标值,\(\beta\) 为平滑参数。

输入:
  • predict - 预测值数据地址。

  • target - 目标值数据地址。

  • length - 计算长度。

  • beta - 平滑参数(FT78NE平台为float值,MT7004平台为half*指针)。

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

输出:
  • out - 计算结果地址。

支持平台:

FT78NE MT7004

备注

  • FT78NE 支持int8, fp32

  • MT7004 支持fp16, fp32

共享存储版本:

void i8_smoothl1loss_s(int8_t *out, int8_t *predict, int8_t *target, int length, float beta, int core_mask)
void fp_smoothl1loss_s(float *out, float *predict, float *target, int length, float beta, int core_mask)
void hp_smoothl1loss_s(half *out, half *predict, half *target, int length, half *beta, int core_mask)

C调用示例:

 1//FT78NE示例
 2#include <stdio.h>
 3#include <smoothl1loss.h>
 4
 5int main(int argc, char* argv[]) {
 6    float *predict = (float *)0xA0000000;   //predict在DDR空间
 7    float *target = (float *)0xB0000000;    //target在DDR空间
 8    float *out = (float *)0xC0000000;       //out在DDR空间
 9    int length = 1000;
10    float beta = 1.0f;
11    int core_mask = 0xff;
12    fp_smoothl1loss_s(out, predict, target, length, beta, core_mask);
13    return 0;
14}

私有存储版本:

void i8_smoothl1loss_p(int8_t *out, int8_t *predict, int8_t *target, int length, float beta)
void fp_smoothl1loss_p(float *out, float *predict, float *target, int length, float beta)
void hp_smoothl1loss_p(half *out, half *predict, half *target, int length, half *beta)

C调用示例:

 1//FT78NE示例
 2#include <stdio.h>
 3#include <smoothl1loss.h>
 4
 5int main(int argc, char* argv[]) {
 6    float *predict = (float *)0x10810000;   //predict在L2空间
 7    float *target = (float *)0x10850000;    //target在L2空间
 8    float *out = (float *)0x108A0000;       //out在L2空间
 9    int length = 1000;
10    float beta = 1.0f;
11    fp_smoothl1loss_p(out, predict, target, length, beta);
12    return 0;
13}