#include <vector>

#include "caffe/layers/loss_layer.hpp"

namespace caffe {

template <typename Dtype>

void LossLayer<Dtype>::LayerSetUp(

const vector<Blob<Dtype>*>& bottom, const vector<Blob<Dtype>*>& top) {

// LossLayers have a non-zero (1) loss by default.

if (this->layer_param_.loss_weight_size() == 0) {

this->layer_param_.add_loss_weight(Dtype(1));

}

}

template <typename Dtype>

void LossLayer<Dtype>::Reshape(

const vector<Blob<Dtype>*>& bottom, const vector<Blob<Dtype>*>& top) {

CHECK_EQ(bottom[0]->shape(0), bottom[1]->shape(0))

<< "The data and label should have the same first dimension.";

vector<int> loss_shape(0); // Loss layers output a scalar; 0 axes.

top[0]->Reshape(loss_shape);

}

INSTANTIATE_CLASS(LossLayer);

} // namespace caffe