File size: 3,207 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 | #include "edge-impulse-sdk/dsp/config.hpp"
#if EIDSP_LOAD_CMSIS_DSP_SOURCES
/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_logsumexp_f16.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_f16.h"
#if defined(ARM_FLOAT16_SUPPORTED)
#include <limits.h>
#include <math.h>
/**
@ingroup groupStats
*/
/**
@defgroup Entropy Entropy
Computes the entropy of a distribution
*/
/**
* @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_MVE_FLOAT16) && !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_f16.h"
float16_t arm_entropy_f16(const float16_t * pSrcA,uint32_t blockSize)
{
uint32_t blkCnt;
_Float16 accum=0.0f16,p;
blkCnt = blockSize;
f16x8_t vSum = vdupq_n_f16(0.0f);
/* Compute 4 outputs at a time */
blkCnt = blockSize >> 3U;
while (blkCnt > 0U)
{
f16x8_t vecIn = vld1q(pSrcA);
vSum = vaddq_f16(vSum, vmulq(vecIn, vlogq_f16(vecIn)));
/*
* Decrement the blockSize loop counter
* Advance vector source and destination pointers
*/
pSrcA += 8;
blkCnt --;
}
accum = vecAddAcrossF16Mve(vSum);
/* Tail */
blkCnt = blockSize & 0x7;
while(blkCnt > 0)
{
p = *pSrcA++;
accum += p * (_Float16)logf((float32_t)p);
blkCnt--;
}
return (-accum);
}
#else
float16_t arm_entropy_f16(const float16_t * pSrcA,uint32_t blockSize)
{
const float16_t *pIn;
uint32_t blkCnt;
_Float16 accum, p;
pIn = pSrcA;
blkCnt = blockSize;
accum = 0.0f;
while(blkCnt > 0)
{
p = *pIn++;
accum += p * (_Float16)logf((float32_t)p);
blkCnt--;
}
return(-accum);
}
#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
/**
* @} end of Entropy group
*/
#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
#endif // EIDSP_LOAD_CMSIS_DSP_SOURCES
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