1
2 /* ----------------------------------------------------------------------
3 * Project: CMSIS DSP Library
4 * Title: arm_cosine_distance_f32.c
5 * Description: Cosine distance between two vectors
6 *
7 *
8 * Target Processor: Cortex-M cores
9 * -------------------------------------------------------------------- */
10 /*
11 * Copyright (C) 2010-2019 ARM Limited or its affiliates. All rights reserved.
12 *
13 * SPDX-License-Identifier: Apache-2.0
14 *
15 * Licensed under the Apache License, Version 2.0 (the License); you may
16 * not use this file except in compliance with the License.
17 * You may obtain a copy of the License at
18 *
19 * www.apache.org/licenses/LICENSE-2.0
20 *
21 * Unless required by applicable law or agreed to in writing, software
22 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
23 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
24 * See the License for the specific language governing permissions and
25 * limitations under the License.
26 */
27
28 #include "arm_math.h"
29 #include <limits.h>
30 #include <math.h>
31
32
33 /**
34 @addtogroup FloatDist
35 @{
36 */
37
38
39
40 /**
41 * @brief Cosine distance between two vectors
42 *
43 * @param[in] pA First vector
44 * @param[in] pB Second vector
45 * @param[in] blockSize vector length
46 * @return distance
47 *
48 */
49
arm_cosine_distance_f32(const float32_t * pA,const float32_t * pB,uint32_t blockSize)50 float32_t arm_cosine_distance_f32(const float32_t *pA,const float32_t *pB, uint32_t blockSize)
51 {
52 float32_t pwra,pwrb,dot,tmp;
53
54 arm_power_f32(pA, blockSize, &pwra);
55 arm_power_f32(pB, blockSize, &pwrb);
56
57 arm_dot_prod_f32(pA,pB,blockSize,&dot);
58
59 arm_sqrt_f32(pwra * pwrb, &tmp);
60 return(1.0f - dot / tmp);
61
62 }
63
64
65
66 /**
67 * @} end of FloatDist group
68 */
69