batch_reindex_layer.hpp

#ifndef CAFFE_BATCHREINDEX_LAYER_HPP_
#define CAFFE_BATCHREINDEX_LAYER_HPP_

#include <utility>
#include <vector>

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

namespace caffe {

template <typename Dtype>
class BatchReindexLayer : public Layer<Dtype> {
 public:
  explicit BatchReindexLayer(const LayerParameter& param)
      : Layer<Dtype>(param) {}
  virtual void Reshape(const vector<Blob<Dtype>*>& bottom,
      const vector<Blob<Dtype>*>& top);

  virtual inline const char* type() const { return "BatchReindex"; }
  virtual inline int ExactNumBottomBlobs() const { return 2; }
  virtual inline int ExactNumTopBlobs() 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);

 private:
  struct pair_sort_first {
    bool operator()(const std::pair<int, int> &left,
                    const std::pair<int, int> &right) {
      return left.first < right.first;
    }
  };
  void check_batch_reindex(int initial_num, int final_num,
                           const Dtype* ridx_data);
};

}  // namespace caffe

#endif  // CAFFE_BATCHREINDEX_LAYER_HPP_