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#include <vector>
#include "caffe/neuron_layers.hpp"
#include "caffe/util/math_functions.hpp"
namespace caffe {
template <typename Dtype>
void LogLayer<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 (input_scale_ == Dtype(1) && input_shift_ == Dtype(0)) {
caffe_gpu_log(count, bottom_data, top_data);
} else {
caffe_copy(count, bottom_data, top_data);
if (input_scale_ != Dtype(1)) {
caffe_gpu_scal(count, input_scale_, top_data);
}
if (input_shift_ != Dtype(0)) {
caffe_gpu_add_scalar(count, input_shift_, top_data);
}
caffe_gpu_log(count, top_data, top_data);
}
if (base_scale_ != Dtype(1)) {
caffe_gpu_scal(count, base_scale_, top_data);
}
}
template <typename Dtype>
void LogLayer<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* bottom_data = bottom[0]->gpu_data();
const Dtype* top_diff = top[0]->gpu_diff();
Dtype* bottom_diff = bottom[0]->mutable_gpu_diff();
caffe_copy(count, bottom_data, bottom_diff);
if (input_scale_ != Dtype(1)) {
caffe_gpu_scal(count, input_scale_, bottom_diff);
}
if (input_shift_ != Dtype(0)) {
caffe_gpu_add_scalar(count, input_shift_, bottom_diff);
}
caffe_gpu_powx(count, bottom_diff, Dtype(-1), bottom_diff);
if (backward_num_scale_ != Dtype(1)) {
caffe_gpu_scal(count, backward_num_scale_, bottom_diff);
}
caffe_gpu_mul(count, top_diff, bottom_diff, bottom_diff);
}
INSTANTIATE_LAYER_GPU_FUNCS(LogLayer);
} // namespace caffe
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