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#ifndef _DTRAIN_KBESTGET_H_
#define _DTRAIN_KBESTGET_H_
namespace dtrain
{
/*
* KBestList
*
*/
struct KBestList {
vector<SparseVector<double> > feats;
vector<vector<WordID> > sents;
vector<double> scores;
};
/*
* KBestGetter
*
*/
struct KBestGetter : public DecoderObserver
{
KBestGetter( const size_t k ) : k_(k) {}
const size_t k_;
KBestList kb;
virtual void
NotifyTranslationForest(const SentenceMetadata& smeta, Hypergraph* hg)
{
GetKBest(smeta.GetSentenceID(), *hg);
}
KBestList* GetKBest() { return &kb; }
void
GetKBest(int sent_id, const Hypergraph& forest)
{
kb.scores.clear();
kb.sents.clear();
kb.feats.clear();
KBest::KBestDerivations<vector<WordID>, ESentenceTraversal> kbest( forest, k_ );
for ( size_t i = 0; i < k_; ++i ) {
const KBest::KBestDerivations<vector<WordID>, ESentenceTraversal>::Derivation* d =
kbest.LazyKthBest( forest.nodes_.size() - 1, i );
if (!d) break;
kb.sents.push_back( d->yield);
kb.feats.push_back( d->feature_values );
kb.scores.push_back( d->score );
}
}
};
} // namespace
#endif
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