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// Copyright 2014 BVLC and contributors.
#include <vector>
#include <cfloat>
#include "caffe/layer.hpp"
#include "caffe/vision_layers.hpp"
namespace caffe {
template <typename Dtype>
void ArgMaxLayer<Dtype>::SetUp(const vector<Blob<Dtype>*>& bottom,
vector<Blob<Dtype>*>* top) {
CHECK_EQ(bottom.size(), 1) << "ArgMaxLayer Layer takes 1 input.";
CHECK_EQ(top->size(), 1) << "ArgMaxLayer Layer takes 1 output.";
out_max_val_ = this->layer_param_.argmax_param().out_max_val();
if (out_max_val_) {
// Produces max_ind and max_val
(*top)[0]->Reshape(bottom[0]->num(), 2, 1, 1);
} else {
// Produces only max_ind
(*top)[0]->Reshape(bottom[0]->num(), 1, 1, 1);
}
}
template <typename Dtype>
Dtype ArgMaxLayer<Dtype>::Forward_cpu(const vector<Blob<Dtype>*>& bottom,
vector<Blob<Dtype>*>* top) {
const Dtype* bottom_data = bottom[0]->cpu_data();
Dtype* top_data = (*top)[0]->mutable_cpu_data();
int num = bottom[0]->num();
int dim = bottom[0]->count() / bottom[0]->num();
for (int i = 0; i < num; ++i) {
// Accuracy
Dtype max_val = -FLT_MAX;
int max_ind = 0;
for (int j = 0; j < dim; ++j) {
if (bottom_data[i * dim + j] > max_val) {
max_val = bottom_data[i * dim + j];
max_ind = j;
}
}
if (out_max_val_) {
top_data[i * 2] = max_ind;
top_data[i * 2 + 1] = max_val;
} else {
top_data[i] = max_ind;
}
}
return Dtype(0);
}
INSTANTIATE_CLASS(ArgMaxLayer);
} // namespace caffe
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