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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>
Dtype SliceLayer<Dtype>::Forward_gpu(const vector<Blob<Dtype>*>& bottom,
vector<Blob<Dtype>*>* top) {
const Dtype* bottom_data = bottom[0]->mutable_gpu_data();
if (slice_dim_ == 0) {
int offset_num = 0;
for (int i = 0; i < top->size(); ++i) {
Blob<Dtype>* blob = (*top)[i];
Dtype* top_data = blob->mutable_gpu_data();
caffe_copy(blob->count(), bottom_data + bottom[0]->offset(offset_num),
top_data);
offset_num += blob->num();
}
} else if (slice_dim_ == 1) {
int offset_channel = 0;
for (int i = 0; i < top->size(); ++i) {
Blob<Dtype>* blob = (*top)[i];
Dtype* top_data = blob->mutable_gpu_data();
const int num_elem = blob->channels() * blob->height() * blob->width();
for (int n = 0; n < num_; ++n) {
caffe_copy(num_elem, bottom_data + bottom[0]->offset(n, offset_channel),
top_data + blob->offset(n));
}
offset_channel += blob->channels();
}
} // slice_dim_ is guaranteed to be 0 or 1 by SetUp.
return Dtype(0.);
}
template <typename Dtype>
void SliceLayer<Dtype>::Backward_gpu(const vector<Blob<Dtype>*>& top,
const vector<bool>& propagate_down, vector<Blob<Dtype>*>* bottom) {
if (!propagate_down[0]) { return; }
Dtype* bottom_diff = (*bottom)[0]->mutable_gpu_diff();
if (slice_dim_ == 0) {
int offset_num = 0;
for (int i = 0; i < top.size(); ++i) {
Blob<Dtype>* blob = top[i];
const Dtype* top_diff = blob->gpu_diff();
caffe_copy(blob->count(), top_diff,
bottom_diff + (*bottom)[0]->offset(offset_num));
offset_num += blob->num();
}
} else if (slice_dim_ == 1) {
int offset_channel = 0;
for (int i = 0; i < top.size(); ++i) {
Blob<Dtype>* blob = top[i];
const Dtype* top_diff = blob->gpu_diff();
const int num_elem = blob->channels() * blob->height() * blob->width();
for (int n = 0; n < num_; ++n) {
caffe_copy(num_elem, top_diff + blob->offset(n),
bottom_diff + (*bottom)[0]->offset(n, offset_channel));
}
offset_channel += blob->channels();
}
} // slice_dim_ is guaranteed to be 0 or 1 by SetUp.
}
INSTANTIATE_CLASS(SliceLayer);
} // namespace caffe
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