两个向量差值的1范数（L1）、2范数（L2）或∞范数（Inf）。计算公式如下：

L1范数
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L2范数
 $\text{[math]}$
∞范数
 $\text{[math]}$

函数接口声明如下：

L1范数：
HmppResult HMPPS_NormDiff_L1_32f(const float* src1, const float* src2, int32_t len, float* norm);

HmppResult HMPPS_NormDiff_L1_64f(const double* src1, const double* src2, int32_t len, double* norm);

HmppResult HMPPS_NormDiff_L1_16s32f(const int16_t* src1, const int16_t* src2, int32_t len, float* norm);

HmppResult HMPPS_NormDiff_L1_32fc64f(const Hmpp32fc* src1, const Hmpp32fc* src2, int32_t len, double* norm);

HmppResult HMPPS_NormDiff_L1_64fc64f(const Hmpp64fc* src1, const Hmpp64fc* src2, int32_t len, double* norm);
有缩放的L1范数：
HmppResult HMPPS_NormDiff_L1_16s32s_S(const int16_t* src1, const int16_t* src2, int32_t len, int32_t* norm, double scale);

HmppResult HMPPS_NormDiff_L1_16s64s_S(const int16_t* src1, const int16_t* src2, int32_t len, int64_t* norm, double scale);
L2范数：
HmppResult HMPPS_NormDiff_L2_32f(const float* src1, const float* src2, int32_t len, float* norm);

HmppResult HMPPS_NormDiff_L2_64f(const double* src1, const double* src2, int32_t len, double* norm);

HmppResult HMPPS_NormDiff_L2_16s32f(const int16_t* src1, const int16_t* src2, int32_t len, float* norm);

HmppResult HMPPS_NormDiff_L2_32fc64f(const Hmpp32fc* src1, const Hmpp32fc* src2, int32_t len, double* norm);

HmppResult HMPPS_NormDiff_L2_64fc64f(const Hmpp64fc* src1, const Hmpp64fc* src2, int32_t len, double* norm);
有缩放的L2范数：
HmppResult HMPPS_NormDiff_L2_16s32s_S(const int16_t* src1, const int16_t* src2, int32_t len, int32_t* norm, double scale);
有缩放的L2Sqr范数
HmppResult HMPPS_NormDiff_L2Sqr_16s64s_S(const int16_t* src1, const int16_t* src2, int32_t len, int64_t* norm, double scale);
无穷范数
HmppResult HMPPS_NormDiff_Inf_32f(const float* src1, const float* src2, int32_t len, float* norm);

HmppResult HMPPS_NormDiff_Inf_64f(const double* src1, const double* src2, int32_t len, double* norm);

HmppResult HMPPS_NormDiff_Inf_16s32f(const int16_t* src1, const int16_t* src2, int32_t len, float* norm);

HmppResult HMPPS_NormDiff_Inf_32fc32f(const Hmpp32fc* rc1, const Hmpp32fc* src2, int32_t len, float* norm);

HmppResult HMPPS_NormDiff_Inf_64fc64f(const Hmpp64fc* src1, const Hmpp64fc* src2, int32_t len, double* norm);
有缩放的无穷范数
HmppResult HMPPS_NormDiff_Inf_16s32s_S(const int16_t* src1, const int16_t* src2, int32_t len, int32_t* norm, double scale);

参数

参数名	描述	取值范围	输入/输出
src1	指向被减数的指针。	非空	输入
src2	指向减数的指针。	非空	输入
len	向量长度。	(0,INT_MAX]	输入
norm	指向范数的指针。	非空	输出
scale	缩放因数。	(0,INF)且输入为2^n	输入

返回值

成功：返回HMPP_STS_NO_ERR。
失败：返回错误码。

错误码

错误码	描述
HMPP_STS_NULL_PTR_ERR	src1、src2、norm这几个入参中存在空指针。
HMPP_STS_SIZE_ERR	len小于或等于0。
HMPP_STS_SCALE_ERR	scale不在(0,INF)范围内或输入为nan。

示例

#define BUFFER_SIZE_T 10
void NormDiffExample(void) {
  float src1[BUFFER_SIZE_T] = {3, 0, 2, -8, 3, 1, 7, 5, -2, 1};
  float src2[BUFFER_SIZE_T] = {1, -7, 3, 7, 8, 2, 4, -8, 5, 5};
  float norm1[1];
  float norm2[1];
  float norm3[1];
  HmppResult sign1, sign2, sign3;

  sign1 = HMPPS_NormDiff_Inf_32f(src1, src2, BUFFER_SIZE_T, norm1);
  printf("NormDiffInf: result = %d\n", sign1);
  if (sign1 != HMPP_STS_NO_ERR) {
    return;
  }
  printf("Inf = %.2f\n", norm1[0]);

  sign2 = HMPPS_NormDiff_L1_32f(src1, src2, BUFFER_SIZE_T, norm2);
  printf("NormDiffL1: result = %d\n", sign2);
  if (sign2 != HMPP_STS_NO_ERR) {
    return;
  }
  printf("L1 = %.2f\n", norm2[0]);

  sign3 = HMPPS_NormDiff_L2_32f(src1, src2, BUFFER_SIZE_T, norm3);
  printf("NormDiffL2: result = %d\n", sign3);
  if (sign3 != HMPP_STS_NO_ERR) {
    return;
  }
  printf("L2 = %.2f\n", norm3[0]);
  printf("\n");
}

运行结果：

NormDiffInf: result = 0
Inf = 15.00
NormDiffL1: result = 0
L1 = 58.00
NormDiffL2: result = 0
L2 = 23.41