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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_canberra_distance_f16.c
* Description: Canberra distance between two vectors
*
* $Date: 23 April 2021
* $Revision: V1.9.0
*
* Target Processor: Cortex-M and Cortex-A cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "dsp/distance_functions_f16.h"
#if defined(ARM_FLOAT16_SUPPORTED)
#include <limits.h>
#include <math.h>
/**
@ingroup FloatDist
*/
/**
@defgroup Canberra Canberra distance
Canberra distance
*/
/**
@addtogroup Canberra
@{
*/
/**
* @brief Canberra distance between two vectors
*
* This function may divide by zero when samples pA[i] and pB[i] are both zero.
* The result of the computation will be correct. So the division per zero may be
* ignored.
*
* @param[in] pA First vector
* @param[in] pB Second vector
* @param[in] blockSize vector length
* @return distance
*
*/
#if defined(ARM_MATH_MVE_FLOAT16) && !defined(ARM_MATH_AUTOVECTORIZE)
#include "arm_helium_utils.h"
#include "arm_vec_math_f16.h"
float16_t arm_canberra_distance_f16(const float16_t *pA,const float16_t *pB, uint32_t blockSize)
{
_Float16 accum = 0.0f16;
uint32_t blkCnt;
f16x8_t a, b, c, accumV;
accumV = vdupq_n_f16(0.0f);
blkCnt = blockSize >> 3;
while (blkCnt > 0) {
a = vld1q(pA);
b = vld1q(pB);
c = vabdq(a, b);
a = vabsq(a);
b = vabsq(b);
a = vaddq(a, b);
/*
* May divide by zero when a and b have both the same lane at zero.
*/
a = vrecip_hiprec_f16(a);
/*
* Force result of a division by 0 to 0. It the behavior of the
* sklearn canberra function.
*/
a = vdupq_m_n_f16(a, 0.0f, vcmpeqq(a, 0.0f));
c = vmulq(c, a);
accumV = vaddq(accumV, c);
pA += 8;
pB += 8;
blkCnt--;
}
blkCnt = blockSize & 7;
if (blkCnt > 0U) {
mve_pred16_t p0 = vctp16q(blkCnt);
a = vldrhq_z_f16(pA, p0);
b = vldrhq_z_f16(pB, p0);
c = vabdq(a, b);
a = vabsq(a);
b = vabsq(b);
a = vaddq(a, b);
/*
* May divide by zero when a and b have both the same lane at zero.
*/
a = vrecip_hiprec_f16(a);
/*
* Force result of a division by 0 to 0. It the behavior of the
* sklearn canberra function.
*/
a = vdupq_m_n_f16(a, 0.0f, vcmpeqq(a, 0.0f));
c = vmulq(c, a);
accumV = vaddq_m(accumV, accumV, c, p0);
}
accum = vecAddAcrossF16Mve(accumV);
return (accum);
}
#else
float16_t arm_canberra_distance_f16(const float16_t *pA,const float16_t *pB, uint32_t blockSize)
{
_Float16 accum=0.0f, tmpA, tmpB,diff,sum;
while(blockSize > 0)
{
tmpA = *pA++;
tmpB = *pB++;
diff = fabsf((float32_t)((_Float16)tmpA - (_Float16)tmpB));
sum = (_Float16)fabsf((float32_t)tmpA) + (_Float16)fabsf((float32_t)tmpB);
if (((_Float16)tmpA != 0.0f16) || ((_Float16)tmpB != 0.0f16))
{
accum += ((_Float16)diff / (_Float16)sum);
}
blockSize --;
}
return(accum);
}
#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
/**
* @} end of Canberra group
*/
#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
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