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#ifndef _DTRAIN_UPDATE_H_
#define _DTRAIN_UPDATE_H_
namespace dtrain
{
bool
_cmp(ScoredHyp a, ScoredHyp b)
{
return a.gold > b.gold;
}
inline bool
_good(ScoredHyp& a, ScoredHyp& b, weight_t margin)
{
if ((a.model-b.model)>margin
|| a.gold==b.gold)
return true;
return false;
}
/*
* multipartite ranking
* sort (descending) by bleu
* compare top X (hi) to middle Y (med) and low X (lo)
* cmp middle Y to low X
*/
inline size_t
CollectUpdates(vector<ScoredHyp>* s,
SparseVector<weight_t>& updates,
weight_t margin=0.)
{
size_t num_up = 0;
size_t sz = s->size();
sort(s->begin(), s->end(), _cmp);
size_t sep = round(sz*0.1);
for (size_t i = 0; i < sep; i++) {
for (size_t j = sep; j < sz; j++) {
if (_good((*s)[i], (*s)[j], margin))
continue;
updates += (*s)[i].f-(*s)[j].f;
num_up++;
}
}
size_t sep_lo = sz-sep;
for (size_t i = sep; i < sep_lo; i++) {
for (size_t j = sep_lo; j < sz; j++) {
if (_good((*s)[i], (*s)[j], margin))
continue;
updates += (*s)[i].f-(*s)[j].f;
num_up++;
}
}
return num_up;
}
} // namespace
#endif
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