text: #include "edge-impulse-sdk/dsp/config.hpp"
  #if EIDSP_LOAD_CMSIS_DSP_SOURCES
  /* ----------------------------------------------------------------------
   * Project:      CMSIS DSP Library
   * Title:        arm_logsumexp_f32.c
   * Description:  LogSumExp
   *
   *
   * Target Processor: Cortex-M and Cortex-A cores
   * -------------------------------------------------------------------- */
  /*
   * Copyright (C) 2010-2019 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/arm_math.h"
  #include <limits.h>
  #include <math.h>
  
  
  /**
   * @addtogroup groupStats
   * @{
   */
  
  
  /**
   * @brief Kullback-Leibler
   *
   * Distribution A may contain 0 with Neon version.
   * Result will be right but some exception flags will be set.
   *
   * Distribution B must not contain 0 probability.
   *
   * @param[in]  *pSrcA         points to an array of input values for probaility distribution A.
   * @param[in]  *pSrcB         points to an array of input values for probaility distribution B.
   * @param[in]  blockSize      number of samples in the input array.
   * @return Kullback-Leibler divergence D(A || B)
   *
   */
  
  #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_kullback_leibler_f32(const float32_t * pSrcA,const float32_t * pSrcB,uint32_t blockSize)
  {
      uint32_t blkCnt;
      float32_t accum, pA,pB;
   
      
      blkCnt = blockSize;
  
      accum = 0.0f;
  
      f32x4_t         vSum = vdupq_n_f32(0.0f);
      blkCnt = blockSize >> 2;
      while(blkCnt > 0)
      {
          f32x4_t         vecA = vld1q(pSrcA);
          f32x4_t         vecB = vld1q(pSrcB);
          f32x4_t         vRatio;
  
          vRatio = vdiv_f32(vecB, vecA);
          vSum = vaddq_f32(vSum, vmulq(vecA, vlogq_f32(vRatio)));
  
          /*
           * Decrement the blockSize loop counter
           * Advance vector source and destination pointers
           */
          pSrcA += 4;
          pSrcB += 4;
          blkCnt --;
      }
  
      accum = vecAddAcrossF32Mve(vSum);
  
      blkCnt = blockSize & 3;
      while(blkCnt > 0)
      {
         pA = *pSrcA++;
         pB = *pSrcB++;
         accum += pA * logf(pB / pA);
         
         blkCnt--;
      
      }
  
      return(-accum);
  }
  
  #else
  #if defined(ARM_MATH_NEON) && !defined(ARM_MATH_AUTOVECTORIZE)
  
  #include "NEMath.h"
  
  float32_t arm_kullback_leibler_f32(const float32_t * pSrcA,const float32_t * pSrcB,uint32_t blockSize)
  {
      const float32_t *pInA, *pInB;
      uint32_t blkCnt;
      float32_t accum, pA,pB;
  
      float32x4_t accumV;
      float32x2_t accumV2;
      float32x4_t tmpVA, tmpVB,tmpV;
   
      pInA = pSrcA;
      pInB = pSrcB;
  
      accum = 0.0f;
      accumV = vdupq_n_f32(0.0f);
  
      blkCnt = blockSize >> 2;
      while(blkCnt > 0)
      {
        tmpVA = vld1q_f32(pInA);
        pInA += 4;
  
        tmpVB = vld1q_f32(pInB);
        pInB += 4;
  
        tmpV = vinvq_f32(tmpVA);
        tmpVB = vmulq_f32(tmpVB, tmpV);
        tmpVB = vlogq_f32(tmpVB);
  
        accumV = vmlaq_f32(accumV, tmpVA, tmpVB);
         
        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)
      {
         pA = *pInA++;
         pB = *pInB++;
         accum += pA * logf(pB/pA);
         
         blkCnt--;
      
      }
  
      return(-accum);
  }
  
  #else
  float32_t arm_kullback_leibler_f32(const float32_t * pSrcA,const float32_t * pSrcB,uint32_t blockSize)
  {
      const float32_t *pInA, *pInB;
      uint32_t blkCnt;
      float32_t accum, pA,pB;
   
      pInA = pSrcA;
      pInB = pSrcB;
      blkCnt = blockSize;
  
      accum = 0.0f;
  
      while(blkCnt > 0)
      {
         pA = *pInA++;
         pB = *pInB++;
         accum += pA * logf(pB / pA);
         
         blkCnt--;
      
      }
  
      return(-accum);
  }
  #endif
  #endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
  
  /**
   * @} end of groupStats group
   */
  -e 
  #endif // EIDSP_LOAD_CMSIS_DSP_SOURCES
  