ELU.cpp

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/*
 * Copyright (c) 2019 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 "ReLU.h"
#include "Common.h"
 
#include "mir/ShapeRange.h"
#include "mir/Tensor.h"
 
#include <cmath>
 
namespace mir_interpreter
{
 
template <typename T> struct ELUImpl
{
  static void run(const mir::TensorVariant &arg, float alpha, mir::TensorVariant &result);
};
 
template <typename T>
void ELUImpl<T>::run(const mir::TensorVariant &arg, float alpha, mir::TensorVariant &result)
{
  mir::Tensor<T> arg_accessor(arg);
  mir::Tensor<T> res_accessor(result);
 
  for (const auto &index : mir::ShapeRange(result.getShape()))
  {
    const T x = arg_accessor.at(index);
    res_accessor.at(index) = x < 0 ? alpha * (std::exp(x) - 1) : x;
  }
}
 
void ELU(const mir::TensorVariant &arg, float alpha, mir::TensorVariant &result)
{
  dispatch<ELUImpl>(result.getElementType(), arg, alpha, result);
}
 
} // namespace mir_interpreter