File size: 3,865 Bytes
25ade36 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | #include "edge-impulse-sdk/dsp/config.hpp"
#if EIDSP_LOAD_CMSIS_DSP_SOURCES
/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_logsumexp_f32.c
* Description: LogSumExp
*
* $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 "edge-impulse-sdk/CMSIS/DSP/Include/dsp/statistics_functions.h"
#include <limits.h>
#include <math.h>
/**
* @addtogroup Entropy
* @{
*/
/**
* @brief Entropy
*
* @param[in] pSrcA Array of input values.
* @param[in] blockSize Number of samples in the input array.
* @return Entropy -Sum(p ln p)
*
*/
#if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
#include "edge-impulse-sdk/CMSIS/DSP/Include/arm_helium_utils.h"
#include "edge-impulse-sdk/CMSIS/DSP/Include/arm_vec_math.h"
float32_t arm_entropy_f32(const float32_t * pSrcA,uint32_t blockSize)
{
uint32_t blkCnt;
float32_t accum=0.0f,p;
blkCnt = blockSize;
f32x4_t vSum = vdupq_n_f32(0.0f);
/* Compute 4 outputs at a time */
blkCnt = blockSize >> 2U;
while (blkCnt > 0U)
{
f32x4_t vecIn = vld1q(pSrcA);
vSum = vaddq_f32(vSum, vmulq(vecIn, vlogq_f32(vecIn)));
/*
* Decrement the blockSize loop counter
* Advance vector source and destination pointers
*/
pSrcA += 4;
blkCnt --;
}
accum = vecAddAcrossF32Mve(vSum);
/* Tail */
blkCnt = blockSize & 0x3;
while(blkCnt > 0)
{
p = *pSrcA++;
accum += p * logf(p);
blkCnt--;
}
return (-accum);
}
#else
#if defined(ARM_MATH_NEON) && !defined(ARM_MATH_AUTOVECTORIZE)
#include "NEMath.h"
float32_t arm_entropy_f32(const float32_t * pSrcA,uint32_t blockSize)
{
const float32_t *pIn;
uint32_t blkCnt;
float32_t accum, p;
float32x4_t accumV;
float32x2_t accumV2;
float32x4_t tmpV, tmpV2;
pIn = pSrcA;
accum = 0.0f;
accumV = vdupq_n_f32(0.0f);
blkCnt = blockSize >> 2;
while(blkCnt > 0)
{
tmpV = vld1q_f32(pIn);
pIn += 4;
tmpV2 = vlogq_f32(tmpV);
accumV = vmlaq_f32(accumV, tmpV, tmpV2);
blkCnt--;
}
accumV2 = vpadd_f32(vget_low_f32(accumV),vget_high_f32(accumV));
accum = vget_lane_f32(accumV2, 0) + vget_lane_f32(accumV2, 1);
blkCnt = blockSize & 3;
while(blkCnt > 0)
{
p = *pIn++;
accum += p * logf(p);
blkCnt--;
}
return(-accum);
}
#else
float32_t arm_entropy_f32(const float32_t * pSrcA,uint32_t blockSize)
{
const float32_t *pIn;
uint32_t blkCnt;
float32_t accum, p;
pIn = pSrcA;
blkCnt = blockSize;
accum = 0.0f;
while(blkCnt > 0)
{
p = *pIn++;
accum += p * logf(p);
blkCnt--;
}
return(-accum);
}
#endif
#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
/**
* @} end of Entropy group
*/
#endif // EIDSP_LOAD_CMSIS_DSP_SOURCES
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