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#ifndef _DTRAIN_KSAMPLER_H_
#define _DTRAIN_KSAMPLER_H_
#include "hgsampler.h"
#include "kbest.h" // cdec
#include "sampler.h"
namespace dtrain
{
/*
* KSampler
*
*/
struct KSampler : public HypSampler
{
const size_t k_;
vector<ScoredHyp> s_;
MT19937* prng_;
explicit KSampler(const size_t k, MT19937* prng) :
k_(k), prng_(prng) {}
virtual void
NotifyTranslationForest(const SentenceMetadata& smeta, Hypergraph* hg)
{
Sample(*hg);
}
vector<ScoredHyp>* GetSamples() { return &s_; }
void Sample(const Hypergraph& forest) {
s_.clear();
std::vector<HypergraphSampler::Hypothesis> samples;
HypergraphSampler::sample_hypotheses(forest, k_, prng_, &samples);
for ( size_t i = 0; i < k_; ++i ) {
ScoredHyp h;
h.w = samples[i].words;
h.f = samples[i].fmap;
h.model = log(samples[i].model_score);
s_.push_back(h);
}
}
};
} // namespace
#endif
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