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/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_cosine_distance_f32.c
* Description: Cosine 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.h"
#include <limits.h>
#include <math.h>
/**
@addtogroup CosineDist
@{
*/
/**
* @brief Cosine distance between two vectors
*
* @param[in] pA First vector
* @param[in] pB Second vector
* @param[in] blockSize vector length
* @return distance
*
* @par Description
* cosine_distance(u,v) is 1 - u . v / (Norm(u) Norm(v))
*/
float32_t arm_cosine_distance_f32(const float32_t *pA,const float32_t *pB, uint32_t blockSize)
{
float32_t pwra,pwrb,dot,tmp;
arm_power_f32(pA, blockSize, &pwra);
arm_power_f32(pB, blockSize, &pwrb);
arm_dot_prod_f32(pA,pB,blockSize,&dot);
arm_sqrt_f32(pwra * pwrb, &tmp);
return(1.0f - dot / tmp);
}
/**
* @} end of CosineDist group
*/
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