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#ifndef _DTRAIN_PAIRSAMPLING_H_
#define _DTRAIN_PAIRSAMPLING_H_
namespace dtrain
{
inline void
all_pairs(vector<ScoredHyp>* s, vector<pair<ScoredHyp,ScoredHyp> >& training)
{
for (unsigned i = 0; i < s->size()-1; i++) {
for (unsigned j = i+1; j < s->size(); j++) {
pair<ScoredHyp,ScoredHyp> p;
p.first = (*s)[i];
p.second = (*s)[j];
training.push_back(p);
}
}
}
inline void
rand_pairs_5050(vector<ScoredHyp>* s, vector<pair<ScoredHyp,ScoredHyp> >& training,
MT19937* prng)
{
for (unsigned i = 0; i < s->size()-1; i++) {
for (unsigned j = i+1; j < s->size(); j++) {
if (prng->next() < .5) {
pair<ScoredHyp,ScoredHyp> p;
p.first = (*s)[i];
p.second = (*s)[j];
training.push_back(p);
}
}
}
}
bool
_multpart_cmp_hyp_by_score(ScoredHyp a, ScoredHyp b)
{
return a.score < b.score;
}
inline void
multpart108010(vector<ScoredHyp>* s, vector<pair<ScoredHyp,ScoredHyp> >& training)
{
sort(s->begin(), s->end(), _multpart_cmp_hyp_by_score);
pair<ScoredHyp,ScoredHyp> p;
unsigned sz = s->size();
unsigned slice = 10;
unsigned sep = sz%slice;
if (sep == 0) sep = sz/slice;
for (unsigned i = 0; i < sep; i++) {
for(unsigned j = sep; j < sz; j++) {
p.first = (*s)[i];
p.second = (*s)[j];
if(p.first.rank < p.second.rank) training.push_back(p);
}
}
for (unsigned i = sep; i < sz-sep; i++) {
for (unsigned j = sz-sep; j < sz; j++) {
p.first = (*s)[i];
p.second = (*s)[j];
if(p.first.rank < p.second.rank) training.push_back(p);
}
}
}
inline bool
_PRO_accept_pair(pair<ScoredHyp,ScoredHyp> &p)
{
if (fabs(p.first.score - p.second.score) < 0.05) return false;
return true;
}
bool
_PRO_cmp_pair_by_diff(pair<ScoredHyp,ScoredHyp> a, pair<ScoredHyp,ScoredHyp> b)
{
// descending order
return (fabs(a.first.score - a.second.score)) > (fabs(b.first.score - b.second.score));
}
inline void
PROsampling(vector<ScoredHyp>* s, vector<pair<ScoredHyp,ScoredHyp> >& training) // ugly
{
unsigned max_count = 5000, count = 0;
bool b = false;
for (unsigned i = 0; i < s->size()-1; i++) {
for (unsigned j = i+1; j < s->size(); j++) {
pair<ScoredHyp,ScoredHyp> p;
p.first = (*s)[i];
p.second = (*s)[j];
if (_PRO_accept_pair(p)) {
training.push_back(p);
count++;
if (count == max_count) {
b = true;
break;
}
}
}
if (b) break;
}
sort(training.begin(), training.end(), _PRO_cmp_pair_by_diff);
if (training.size() > 50)
training.erase(training.begin()+50, training.end());
return;
}
inline void
all_pairs_discard(vector<ScoredHyp>* s, vector<pair<ScoredHyp,ScoredHyp> >& training)
{
for (unsigned i = 0; i < s->size()-1; i++) {
for (unsigned j = i+1; j < s->size(); j++) {
pair<ScoredHyp,ScoredHyp> p;
p.first = (*s)[i];
p.second = (*s)[j];
if(_PRO_accept_pair(p))
training.push_back(p);
}
}
}
} // namespace
#endif
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