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73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
4 weeks ago
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/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_cosine_distance_f32.c
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* Description: Cosine distance between two vectors
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*
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* $Date: 23 April 2021
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* $Revision: V1.9.0
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*
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* Target Processor: Cortex-M and Cortex-A cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dsp/distance_functions.h"
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#include <limits.h>
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#include <math.h>
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/**
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@addtogroup CosineDist
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@{
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*/
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/**
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* @brief Cosine distance between two vectors
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*
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* @param[in] pA First vector
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* @param[in] pB Second vector
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* @param[in] blockSize vector length
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* @return distance
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*
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* @par Description
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* cosine_distance(u,v) is 1 - u . v / (Norm(u) Norm(v))
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*/
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float32_t arm_cosine_distance_f32(const float32_t *pA,const float32_t *pB, uint32_t blockSize)
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{
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float32_t pwra,pwrb,dot,tmp;
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arm_power_f32(pA, blockSize, &pwra);
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arm_power_f32(pB, blockSize, &pwrb);
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arm_dot_prod_f32(pA,pB,blockSize,&dot);
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arm_sqrt_f32(pwra * pwrb, &tmp);
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return(1.0f - dot / tmp);
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}
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/**
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* @} end of CosineDist group
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*/
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