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Add siamese label functionality to accuracy #4

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Add siamese label functionality to accuracy #4

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11 changes: 9 additions & 2 deletions include/caffe/loss_layers.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -41,8 +41,15 @@ class AccuracyLayer : public Layer<Dtype> {
return LayerParameter_LayerType_ACCURACY;
}

virtual inline int ExactNumBottomBlobs() const { return 2; }
virtual inline int ExactNumTopBlobs() const { return 1; }
// AccuracyLayer takes 2-3 bottom Blobs; if there are 3 the second and third
// are compared to compute a 0/1 label. (Otherwise the label comes directly
// from the second.)
virtual inline int ExactNumBottomBlobs() const { return -1; }
virtual inline int MinBottomBlobs() const { return 2; }
virtual inline int MaxBottomBlobs() const { return 3; }

private:
int ComputeLabel(const vector<Blob<Dtype>*>& bottom, int i);

protected:
/**
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22 changes: 20 additions & 2 deletions src/caffe/layers/accuracy_layer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,23 @@

namespace caffe {

template <typename Dtype>
int AccuracyLayer<Dtype>::ComputeLabel(const vector<Blob<Dtype>*>& bottom, int i) {
int label;
if (bottom.size() == 2) {
label = static_cast<int>(bottom[1]->cpu_data()[i]);
} else { // bottom.size() == 3
// label == 1 if bottom[1] == bottom[2] (same)
// label == 0 if bottom[1] != bottom[2] (not same)
label = (bottom[1]->cpu_data()[i] ==
bottom[2]->cpu_data()[i]) ? 1 : 0;

if (i == 0) {
}
}
return label;
}

template <typename Dtype>
void AccuracyLayer<Dtype>::LayerSetUp(
const vector<Blob<Dtype>*>& bottom, const vector<Blob<Dtype>*>& top) {
Expand All @@ -34,12 +51,13 @@ void AccuracyLayer<Dtype>::Forward_cpu(const vector<Blob<Dtype>*>& bottom,
const vector<Blob<Dtype>*>& top) {
Dtype accuracy = 0;
const Dtype* bottom_data = bottom[0]->cpu_data();
const Dtype* bottom_label = bottom[1]->cpu_data();
int num = bottom[0]->num();
int dim = bottom[0]->count() / bottom[0]->num();
vector<Dtype> maxval(top_k_+1);
vector<int> max_id(top_k_+1);
int label;
for (int i = 0; i < num; ++i) {
label = ComputeLabel(bottom, i);
// Top-k accuracy
std::vector<std::pair<Dtype, int> > bottom_data_vector;
for (int j = 0; j < dim; ++j) {
Expand All @@ -51,7 +69,7 @@ void AccuracyLayer<Dtype>::Forward_cpu(const vector<Blob<Dtype>*>& bottom,
bottom_data_vector.end(), std::greater<std::pair<Dtype, int> >());
// check if true label is in top k predictions
for (int k = 0; k < top_k_; k++) {
if (bottom_data_vector[k].second == static_cast<int>(bottom_label[i])) {
if (bottom_data_vector[k].second == label) {
++accuracy;
break;
}
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