channel_shuffle_layer.hpp

#ifndef CAFFE_CHANNEL_SHUFFLE_LAYER_HPP_
#define CAFFE_CHANNEL_SHUFFLE_LAYER_HPP_

#include <vector>

#include "caffe/blob.hpp"
#include "caffe/layer.hpp"
#include "caffe/proto/caffe.pb.h"

#include "caffe/layers/neuron_layer.hpp"

namespace caffe {

template <typename Dtype>
class ChannelShuffleLayer : public NeuronLayer<Dtype> {
 public:
  
  explicit ChannelShuffleLayer(const LayerParameter& param)
      : NeuronLayer<Dtype>(param) {}
  virtual void LayerSetUp(const vector<Blob<Dtype>*>& bottom,
      const vector<Blob<Dtype>*>& top);
  virtual void Reshape(const vector<Blob<Dtype>*>& bottom,
      const vector<Blob<Dtype>*>& top);
  virtual inline const char* type() const { return "ChannelShuffle"; }
  virtual inline int ExactNumTopBlobs() const { return 1; }
  virtual inline int ExactNumBottomBlobs() const { return 1; }
 protected:

  virtual void Forward_cpu(const vector<Blob<Dtype>*>& bottom,
      const vector<Blob<Dtype>*>& top);
  virtual void Forward_gpu(const vector<Blob<Dtype>*>& bottom,
      const vector<Blob<Dtype>*>& top);

  virtual void Backward_cpu(const vector<Blob<Dtype>*>& top,
      const vector<bool>& propagate_down, const vector<Blob<Dtype>*>& bottom);
  virtual void Backward_gpu(const vector<Blob<Dtype>*>& top,
      const vector<bool>& propagate_down, const vector<Blob<Dtype>*>& bottom);

  int channels_;
  int bottom_dim_;
  int num_;
  int feature_dim_;
  
  int shuffle_pattern; 
  int shf_chnl_num_;
  
  int group_;
  int group_dim_;
  int group_chnl_num_;
};

}  // namespace caffe

#endif  // CAFFE_CHANNEL_SHUFFLE_LAYER_HPP_