MLECO-1252 ASR sample application using the public ArmNN C++ API.
Change-Id: I98cd505b8772a8c8fa88308121bc94135bb45068
Signed-off-by: Éanna Ó Catháin <eanna.ocathain@arm.com>
diff --git a/samples/SpeechRecognition/include/MathUtils.hpp b/samples/SpeechRecognition/include/MathUtils.hpp
new file mode 100644
index 0000000..5f81fb6
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+++ 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);
+};