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#include <vector>
#include "caffe/layer.hpp"
#include "caffe/util/math_functions.hpp"
#include "caffe/vision_layers.hpp"
namespace caffe {
template <typename Dtype>
void SplitLayer<Dtype>::SetUp(const vector<Blob<Dtype>*>& bottom,
vector<Blob<Dtype>*>* top) {
Layer<Dtype>::SetUp(bottom, top);
count_ = bottom[0]->count();
for (int i = 0; i < top->size(); ++i) {
// Allow the 0th top blob to be 'in-place', but no others.
if (i == 0 && (*top)[i] == bottom[0]) {
continue;
} else {
CHECK_NE((*top)[i], bottom[0]) << "Only 0th top blob may be in place.";
}
(*top)[i]->Reshape(bottom[0]->num(), bottom[0]->channels(),
bottom[0]->height(), bottom[0]->width());
CHECK_EQ(count_, (*top)[i]->count());
}
}
template <typename Dtype>
Dtype SplitLayer<Dtype>::Forward_cpu(const vector<Blob<Dtype>*>& bottom,
vector<Blob<Dtype>*>* top) {
for (int i = 0; i < top->size(); ++i) {
(*top)[i]->ShareData(*bottom[0]);
}
return Dtype(0.);
}
template <typename Dtype>
void SplitLayer<Dtype>::Backward_cpu(const vector<Blob<Dtype>*>& top,
const vector<bool>& propagate_down, vector<Blob<Dtype>*>* bottom) {
if (propagate_down[0]) {
(*bottom)[0]->ShareDiff(*top[0]);
// Add remaining top blob diffs.
Dtype* bottom_diff = (*bottom)[0]->mutable_cpu_diff();
for (int i = 1; i < top.size(); ++i) {
const Dtype* top_diff = top[i]->cpu_diff();
caffe_axpy(count_, Dtype(1.), top_diff, bottom_diff);
}
}
}
#ifdef CPU_ONLY
STUB_GPU(SplitLayer);
#endif
INSTANTIATE_CLASS(SplitLayer);
} // namespace caffe
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