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//
// Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include <vector>
#include <cmath>
#include <cstdint>
#include <numeric>
class MathUtils
{
public:
/**
* @brief Computes the FFT for the input vector
* @param[in] input Floating point vector of input elements
* @param[out] fftOutput Output buffer to be populated by computed
* FFTs
* @return none
*/
static void FftF32(std::vector<float>& input,
std::vector<float>& fftOutput);
/**
* @brief Computes the dot product of two 1D floating point
* vectors.
* result = sum(srcA[0]*srcB[0] + srcA[1]*srcB[1] + ..)
* @param[in] srcPtrA pointer to the first element of first
* array
* @param[in] srcPtrB pointer to the first element of second
* array
* @param[in] srcLen Number of elements in the array/vector
* @return dot product
*/
static float DotProductF32(const float* srcPtrA, float* srcPtrB,
int srcLen);
/**
* @brief Computes the squared magnitude of floating point
* complex number array.
* @param[in] ptrSrc pointer to the first element of input
* array
* @param[in] srcLen Number of elements in the array/vector
* @param[out] ptrDst Output buffer to be populated
* @param[in] dstLen output buffer len (for sanity check only)
* @return true if successful, false otherwise
*/
static bool ComplexMagnitudeSquaredF32(const float* ptrSrc,
int srcLen,
float* ptrDst,
int dstLen);
/**
* @brief Computes the natural logarithms of input floating point
* vector
* @param[in] input Floating point input vector
* @param[out] output Pre-allocated buffer to be populated with
* natural log values of each input element
* @return none
*/
static void VecLogarithmF32(std::vector <float>& input,
std::vector <float>& output);
/**
* @brief Gets the mean of a floating point array of elements
* @param[in] ptrSrc pointer to the first element
* @param[in] srcLen Number of elements in the array/vector
* @return average value
*/
static float MeanF32(const float* ptrSrc, uint32_t srcLen);
/**
* @brief Gets the standard deviation of a floating point array
* of elements
* @param[in] ptrSrc pointer to the first element
* @param[in] srcLen Number of elements in the array/vector
* @param[in] mean pre-computed mean value
* @return standard deviation value
*/
static float StdDevF32(const float* ptrSrc, uint32_t srcLen,
float mean);
};
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