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Diffstat (limited to 'samples/SpeechRecognition/include/MathUtils.hpp')
-rw-r--r-- | samples/SpeechRecognition/include/MathUtils.hpp | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/samples/SpeechRecognition/include/MathUtils.hpp b/samples/SpeechRecognition/include/MathUtils.hpp new file mode 100644 index 0000000000..5f81fb6507 --- /dev/null +++ b/samples/SpeechRecognition/include/MathUtils.hpp @@ -0,0 +1,85 @@ +// +// 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(float* srcPtrA, float* srcPtrB, + const 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(float* ptrSrc, + const int srcLen, + float* ptrDst, + const 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(float* ptrSrc, const 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(float* ptrSrc, const uint32_t srcLen, + const float mean); +}; |