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Diffstat (limited to 'samples/SpeechRecognition/include/Decoder.hpp')
-rw-r--r-- | samples/SpeechRecognition/include/Decoder.hpp | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/samples/SpeechRecognition/include/Decoder.hpp b/samples/SpeechRecognition/include/Decoder.hpp new file mode 100644 index 0000000000..69d97ccf64 --- /dev/null +++ b/samples/SpeechRecognition/include/Decoder.hpp @@ -0,0 +1,63 @@ +// +// Copyright © 2020 Arm Ltd and Contributors. All rights reserved. +// SPDX-License-Identifier: MIT +// + +#include <string> +#include <map> +#include <vector> +#include <algorithm> +#include <cmath> + +# pragma once + +namespace asr +{ +/** +* @brief Class used to Decode the output of the ASR inference +* +*/ + class Decoder + { + public: + std::map<int, std::string> m_labels; + /** + * @brief Default constructor + * @param[in] labels - map of labels to be used for decoding to text. + */ + Decoder(std::map<int, std::string>& labels); + + /** + * @brief Function to decode the output into a text string + * @param[in] output - the output vector to decode. + */ + template<typename T> + std::string DecodeOutput(std::vector<T>& contextToProcess) + { + int rowLength = 29; + + std::vector<char> unfilteredText; + + for(int row = 0; row < contextToProcess.size()/rowLength; ++row) + { + std::vector<int16_t> rowVector; + for(int j = 0; j < rowLength; ++j) + { + rowVector.emplace_back(static_cast<int16_t>(contextToProcess[row * rowLength + j])); + } + + int max_index = std::distance(rowVector.begin(),std::max_element(rowVector.begin(), rowVector.end())); + unfilteredText.emplace_back(this->m_labels.at(max_index)[0]); + } + + std::string filteredText = FilterCharacters(unfilteredText); + return filteredText; + } + + /** + * @brief Function to filter out unwanted characters + * @param[in] unfiltered - the unfiltered output to be processed. + */ + std::string FilterCharacters(std::vector<char>& unfiltered); + }; +} // namespace asr |