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#ifndef _DTRAIN_KSAMPLER_H_
#define _DTRAIN_KSAMPLER_H_
#include "kbest.h"
#include "sample_hg.h"
#include "sampler.h"
namespace dtrain
{
/*
* KSampler
*
*/
struct KSampler : public DecoderObserver
{
const size_t k_;
KBestList kb;
MT19937* rng;
explicit KSampler( const size_t k, MT19937* prng ) :
k_(k), rng(prng) {}
virtual void
NotifyTranslationForest( const SentenceMetadata& smeta, Hypergraph* hg )
{
Sample( *hg );
}
KBestList* GetKBest() { return &kb; }
void Sample( const Hypergraph& forest ) {
kb.sents.clear();
kb.feats.clear();
kb.model_scores.clear();
kb.scores.clear();
std::vector<HypergraphSampler::Hypothesis> samples;
HypergraphSampler::sample_hypotheses(forest, k_, rng, &samples);
for ( size_t i = 0; i < k_; ++i ) {
kb.sents.push_back( samples[i].words );
kb.feats.push_back( samples[i].fmap );
kb.model_scores.push_back( log(samples[i].model_score) );
}
}
};
} // namespace
#endif
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