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// Copyright 2014 BVLC and contributors.
#include <vector>
#include "caffe/layer.hpp"
#include "caffe/util/im2col.hpp"
#include "caffe/vision_layers.hpp"
#include "caffe/common.hpp"
namespace caffe {
template <typename Dtype>
Dtype Im2colLayer<Dtype>::Forward_gpu(const vector<Blob<Dtype>*>& bottom,
vector<Blob<Dtype>*>* top) {
const Dtype* bottom_data = bottom[0]->gpu_data();
Dtype* top_data = (*top)[0]->mutable_gpu_data();
for (int n = 0; n < bottom[0]->num(); ++n) {
im2col_gpu(bottom_data + bottom[0]->offset(n), channels_, height_,
width_, kernel_h_, kernel_w_, pad_h_, pad_w_,
stride_h_, stride_w_, top_data + (*top)[0]->offset(n));
}
return Dtype(0.);
}
template <typename Dtype>
void Im2colLayer<Dtype>::Backward_gpu(const vector<Blob<Dtype>*>& top,
const vector<bool>& propagate_down, vector<Blob<Dtype>*>* bottom) {
const Dtype* top_diff = top[0]->gpu_diff();
Dtype* bottom_diff = (*bottom)[0]->mutable_gpu_diff();
for (int n = 0; n < top[0]->num(); ++n) {
col2im_gpu(top_diff + top[0]->offset(n), channels_, height_, width_,
kernel_h_, kernel_w_, pad_h_, pad_w_,
stride_h_, stride_w_, bottom_diff + (*bottom)[0]->offset(n));
}
}
INSTANTIATE_CLASS(Im2colLayer);
} // namespace caffe
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