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#include <vector>
#include "caffe/common.hpp"
#include "caffe/layer.hpp"
#include "caffe/util/im2col.hpp"
#include "caffe/vision_layers.hpp"
namespace caffe {
template <typename Dtype>
void Im2colLayer<Dtype>::Forward_gpu(const vector<Blob<Dtype>*>& bottom,
const vector<Blob<Dtype>*>& top) {
const Dtype* bottom_data = bottom[0]->gpu_data();
Dtype* top_data = top[0]->mutable_gpu_data();
const int num_kernels = channels_ * top[0]->count(channel_axis_ + 1);
for (int n = 0; n < num_; ++n) {
if (!force_nd_im2col_ && num_spatial_axes_ == 2) {
im2col_gpu(bottom_data + n * bottom_dim_, channels_,
bottom[0]->shape(channel_axis_ + 1),
bottom[0]->shape(channel_axis_ + 2),
kernel_shape_.cpu_data()[0], kernel_shape_.cpu_data()[1],
pad_.cpu_data()[0], pad_.cpu_data()[1],
stride_.cpu_data()[0], stride_.cpu_data()[1],
top_data + n * top_dim_);
} else {
im2col_nd_gpu(bottom_data + n * bottom_dim_, num_spatial_axes_,
num_kernels, bottom[0]->gpu_shape() + channel_axis_,
top[0]->gpu_shape() + channel_axis_,
kernel_shape_.gpu_data(), pad_.gpu_data(), stride_.gpu_data(),
top_data + n * top_dim_);
}
}
}
template <typename Dtype>
void Im2colLayer<Dtype>::Backward_gpu(const vector<Blob<Dtype>*>& top,
const vector<bool>& propagate_down, const 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 < num_; ++n) {
if (!force_nd_im2col_ && num_spatial_axes_ == 2) {
col2im_gpu(top_diff + n * top_dim_, channels_,
bottom[0]->shape(channel_axis_ + 1),
bottom[0]->shape(channel_axis_ + 2),
kernel_shape_.cpu_data()[0], kernel_shape_.cpu_data()[1],
pad_.cpu_data()[0], pad_.cpu_data()[1],
stride_.cpu_data()[0], stride_.cpu_data()[1],
bottom_diff + n * bottom_dim_);
} else {
col2im_nd_gpu(top_diff + n * top_dim_, num_spatial_axes_, bottom_dim_,
bottom[0]->gpu_shape() + channel_axis_,
top[0]->gpu_shape() + channel_axis_,
kernel_shape_.gpu_data(), pad_.gpu_data(), stride_.gpu_data(),
bottom_diff + n * bottom_dim_);
}
}
}
INSTANTIATE_LAYER_GPU_FUNCS(Im2colLayer);
} // namespace caffe
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