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/*
* Copyright (c) 2021-2022 Arm Limited. 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
*
* http://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.
*/
#ifndef CLASSIFIER_HPP
#define CLASSIFIER_HPP
#include "ClassificationResult.hpp"
#include "TensorFlowLiteMicro.hpp"
#include <vector>
namespace arm {
namespace app {
/**
* @brief Classifier - a helper class to get certain number of top
* results from the output vector from a classification NN.
**/
class Classifier{
public:
/** @brief Constructor. */
Classifier() = default;
virtual ~Classifier() = default;
/**
* @brief Gets the top N classification results from the
* output vector.
* @param[in] outputTensor Inference output tensor from an NN model.
* @param[out] vecResults A vector of classification results.
* populated by this function.
* @param[in] labels Labels vector to match classified classes.
* @param[in] topNCount Number of top classifications to pick.
* @param[in] useSoftmax Whether Softmax normalisation should be applied to output.
* @return true if successful, false otherwise.
**/
virtual bool GetClassificationResults(
TfLiteTensor* outputTensor,
std::vector<ClassificationResult>& vecResults,
const std::vector <std::string>& labels, uint32_t topNCount,
bool use_softmax);
/**
* @brief Populate the elements of the Classification Result object.
* @param[in] topNSet Ordered set of top 5 output class scores and labels.
* @param[out] vecResults A vector of classification results.
* populated by this function.
* @param[in] labels Labels vector to match classified classes.
**/
void SetVectorResults(
std::set<std::pair<float, uint32_t>>& topNSet,
std::vector<ClassificationResult>& vecResults,
const std::vector <std::string>& labels);
protected:
/**
* @brief Utility function that gets the top N classification results from the
* output vector.
* @param[in] tensor Inference output tensor from an NN model.
* @param[out] vecResults A vector of classification results
* populated by this function.
* @param[in] topNCount Number of top classifications to pick.
* @param[in] labels Labels vector to match classified classes.
* @return true if successful, false otherwise.
**/
bool GetTopNResults(const std::vector<float>& tensor,
std::vector<ClassificationResult>& vecResults,
uint32_t topNCount,
const std::vector <std::string>& labels);
};
} /* namespace app */
} /* namespace arm */
#endif /* CLASSIFIER_HPP */
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