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#ifndef _DTRAIN_SAMPLE_H_
#define _DTRAIN_SAMPLE_H_
#include "kbest.h"
#include "score.h"
namespace dtrain
{
struct ScoredKbest : public DecoderObserver
{
const size_t k_;
size_t feature_count_, effective_sz_;
vector<ScoredHyp> samples_;
PerSentenceBleuScorer* scorer_;
vector<Ngrams>* ref_ngs_;
vector<size_t>* ref_ls_;
ScoredKbest(const size_t k, PerSentenceBleuScorer* scorer) :
k_(k), scorer_(scorer) {}
virtual void
NotifyTranslationForest(const SentenceMetadata& smeta, Hypergraph* hg)
{
samples_.clear(); effective_sz_ = feature_count_ = 0;
KBest::KBestDerivations<vector<WordID>, ESentenceTraversal,
KBest::FilterUnique, prob_t, EdgeProb> kbest(*hg, k_);
for (size_t i = 0; i < k_; ++i) {
const KBest::KBestDerivations<vector<WordID>, ESentenceTraversal,
KBest::FilterUnique, prob_t, EdgeProb>::Derivation* d =
kbest.LazyKthBest(hg->nodes_.size() - 1, i);
if (!d) break;
ScoredHyp h;
h.w = d->yield;
h.f = d->feature_values;
h.model = log(d->score);
h.rank = i;
h.gold = scorer_->Score(h.w, *ref_ngs_, *ref_ls_);
samples_.push_back(h);
effective_sz_++;
feature_count_ += h.f.size();
}
}
vector<ScoredHyp>* GetSamples() { return &samples_; }
inline void SetReference(vector<Ngrams>& ngs, vector<size_t>& ls)
{
ref_ngs_ = &ngs;
ref_ls_ = &ls;
}
inline size_t GetFeatureCount() { return feature_count_; }
inline size_t GetSize() { return effective_sz_; }
};
} // namespace
#endif
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