#include <vector>

#include "caffe/layers/exp_layer.hpp"

#include "caffe/util/math_functions.hpp"

namespace caffe {

template <typename Dtype>

void ExpLayer<Dtype>::Forward_gpu(const vector<Blob<Dtype>*>& bottom,

const vector<Blob<Dtype>*>& top) {

const int count = bottom[0]->count();

const Dtype* bottom_data = bottom[0]->gpu_data();

Dtype* top_data = top[0]->mutable_gpu_data();

if (inner_scale_ == Dtype(1)) {

caffe_gpu_exp(count, bottom_data, top_data);

} else {

caffe_gpu_scale(count, inner_scale_, bottom_data, top_data);

caffe_gpu_exp(count, top_data, top_data);

}

if (outer_scale_ != Dtype(1)) {

caffe_gpu_scal(count, outer_scale_, top_data);

}

}

template <typename Dtype>

void ExpLayer<Dtype>::Backward_gpu(const vector<Blob<Dtype>*>& top,

const vector<bool>& propagate_down, const vector<Blob<Dtype>*>& bottom) {

if (!propagate_down[0]) { return; }

const int count = bottom[0]->count();

const Dtype* top_data = top[0]->gpu_data();

const Dtype* top_diff = top[0]->gpu_diff();

Dtype* bottom_diff = bottom[0]->mutable_gpu_diff();

caffe_gpu_mul(count, top_data, top_diff, bottom_diff);

if (inner_scale_ != Dtype(1)) {

caffe_gpu_scal(count, inner_scale_, bottom_diff);

}

}

INSTANTIATE_LAYER_GPU_FUNCS(ExpLayer);

} // namespace caffe