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#ifndef _DTRAIN_PAIRSAMPLING_H_
#define _DTRAIN_PAIRSAMPLING_H_
#include "kbestget.h"
#include "sampler.h" // cdec, MT19937
namespace dtrain
{
struct Pair
{
SparseVector<double> first, second;
size_t first_rank, second_rank;
double first_score, second_score;
};
inline void
sample_all_pairs(Samples* kb, vector<Pair> &training)
{
for (size_t i = 0; i < kb->GetSize()-1; i++) {
for (size_t j = i+1; j < kb->GetSize(); j++) {
Pair p;
p.first = kb->feats[i];
p.second = kb->feats[j];
p.first_rank = i;
p.second_rank = j;
p.first_score = kb->scores[i];
p.second_score = kb->scores[j];
training.push_back(p);
} // j
} // i
}
inline void
sample_rand_pairs(Samples* kb, vector<Pair> &training, MT19937* prng)
{
for (size_t i = 0; i < kb->GetSize()-1; i++) {
for (size_t j = i+1; j < kb->GetSize(); j++) {
if (prng->next() < .5) {
Pair p;
p.first = kb->feats[i];
p.second = kb->feats[j];
p.first_rank = i;
p.second_rank = j;
p.first_score = kb->scores[i];
p.second_score = kb->scores[j];
training.push_back(p);
}
} // j
} // i
}
} // namespace
#endif
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