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smooth_L1_loss_layer.hpp
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smooth_L1_loss_layer.hpp
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// ------------------------------------------------------------------
// Fast R-CNN
// copyright (c) 2015 Microsoft
// Licensed under The MIT License [see fast-rcnn/LICENSE for details]
// Written by Ross Girshick
// Modified by Wei Liu
// ------------------------------------------------------------------
#ifndef CAFFE_SMOOTH_L1_LOSS_LAYER_HPP_
#define CAFFE_SMOOTH_L1_LOSS_LAYER_HPP_
#include <vector>
#include "caffe/blob.hpp"
#include "caffe/layer.hpp"
#include "caffe/proto/caffe.pb.h"
#include "caffe/layers/loss_layer.hpp"
namespace caffe {
/**
* @brief Computes the SmoothL1 loss as introduced in:@f$
* Fast R-CNN, Ross Girshick, ICCV 2015.
*/
template <typename Dtype>
class SmoothL1LossLayer : public LossLayer<Dtype> {
public:
explicit SmoothL1LossLayer(const LayerParameter& param)
: LossLayer<Dtype>(param), diff_() {}
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 "SmoothL1Loss"; }
virtual inline int MinBottomBlobs() const { return 2; }
virtual inline int MaxBottomBlobs() const { return 3; }
/**
* Unlike most loss layers, in the SmoothL1LossLayer we can backpropagate
* to both inputs -- override to return true and always allow force_backward.
*/
virtual inline bool AllowForceBackward(const int bottom_index) const {
return true;
}
protected:
/// @copydoc SmoothL1LossLayer
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);
Blob<Dtype> diff_;
Blob<Dtype> errors_;
bool has_weights_;
};
} // namespace caffe
#endif // CAFFE_SMOOTH_L1_LOSS_LAYER_HPP_