CrossEntropy.cpp

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/*
 * Copyright (c) 2024 Samsung Electronics Co., Ltd. All Rights Reserved
 *
 * 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.
 */
 
#include "train/metrics/CrossEntropy.h"
 
#include <cmath>
 
using namespace onert_micro;
using namespace onert_micro::train;
using namespace onert_micro::train::metrics;
 
/*
 * Y - calculated value
 * Y_t - target value
 * E(Y, Y_t) = -SUM(Y_t_i * log(Y_i))
 * SUM - sum among i = (0 ... N - 1), N - flat_size
 */
float CrossEntropy::calculateValue(const uint32_t flat_size, const float *calculated_data,
                                   const float *target_data)
{
  float result_value = 0.f;
 
  for (uint32_t i = 0; i < flat_size; ++i)
  {
    result_value += target_data[i] * std::log(calculated_data[i] + float(10.0e-32));
  }
 
  return -result_value;
}