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#include <vector>
#include "caffe/layer.hpp"
#include "caffe/neuron_layers.hpp"
#include "caffe/util/math_functions.hpp"
namespace caffe {
template <typename Dtype>
void AbsValLayer<Dtype>::LayerSetUp(const vector<Blob<Dtype>*>& bottom,
const vector<Blob<Dtype>*>& top) {
NeuronLayer<Dtype>::LayerSetUp(bottom, top);
CHECK_NE(top[0], bottom[0]) << this->type() << " Layer does not "
"allow in-place computation.";
}
template <typename Dtype>
void AbsValLayer<Dtype>::Forward_cpu(
const vector<Blob<Dtype>*>& bottom, const vector<Blob<Dtype>*>& top) {
const int count = top[0]->count();
Dtype* top_data = top[0]->mutable_cpu_data();
caffe_abs(count, bottom[0]->cpu_data(), top_data);
}
template <typename Dtype>
void AbsValLayer<Dtype>::Backward_cpu(const vector<Blob<Dtype>*>& top,
const vector<bool>& propagate_down, const vector<Blob<Dtype>*>& bottom) {
const int count = top[0]->count();
const Dtype* top_diff = top[0]->cpu_diff();
if (propagate_down[0]) {
const Dtype* bottom_data = bottom[0]->cpu_data();
Dtype* bottom_diff = bottom[0]->mutable_cpu_diff();
caffe_cpu_sign(count, bottom_data, bottom_diff);
caffe_mul(count, bottom_diff, top_diff, bottom_diff);
}
}
#ifdef CPU_ONLY
STUB_GPU(AbsValLayer);
#endif
INSTANTIATE_CLASS(AbsValLayer);
REGISTER_LAYER_CLASS(AbsVal);
} // namespace caffe
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