mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-12-28 14:32:38 +03:00
85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
// $Id$
|
|
#pragma once
|
|
|
|
#include <vector>
|
|
#include <boost/bimap.hpp>
|
|
#include "Implementation.h"
|
|
#include "moses/Hypothesis.h"
|
|
|
|
namespace DALM
|
|
{
|
|
class Logger;
|
|
class Vocabulary;
|
|
class State;
|
|
class LM;
|
|
|
|
typedef unsigned int VocabId;
|
|
}
|
|
|
|
namespace Moses
|
|
{
|
|
class Factor;
|
|
|
|
class LanguageModelDALM : public LanguageModel
|
|
{
|
|
public:
|
|
LanguageModelDALM(const std::string &line);
|
|
virtual ~LanguageModelDALM();
|
|
|
|
void Load();
|
|
|
|
virtual const FFState *EmptyHypothesisState(const InputType &/*input*/) const;
|
|
|
|
virtual void CalcScore(const Phrase &phrase, float &fullScore, float &ngramScore, size_t &oovCount) const;
|
|
|
|
virtual FFState *Evaluate(const Hypothesis &hypo, const FFState *ps, ScoreComponentCollection *out) const;
|
|
|
|
virtual FFState *EvaluateChart(const ChartHypothesis& hypo, int featureID, ScoreComponentCollection *out) const;
|
|
|
|
virtual bool IsUseable(const FactorMask &mask) const;
|
|
|
|
virtual void SetParameter(const std::string& key, const std::string& value);
|
|
|
|
protected:
|
|
const Factor *m_beginSentenceFactor;
|
|
|
|
FactorType m_factorType;
|
|
|
|
std::string m_filePath;
|
|
size_t m_nGramOrder; //! max n-gram length contained in this LM
|
|
|
|
DALM::Logger *m_logger;
|
|
DALM::Vocabulary *m_vocab;
|
|
DALM::LM *m_lm;
|
|
DALM::VocabId wid_start, wid_end;
|
|
|
|
typedef boost::bimap<const Factor *, DALM::VocabId> VocabMap;
|
|
mutable VocabMap m_vocabMap;
|
|
|
|
void CreateVocabMapping(const std::string &wordstxt);
|
|
DALM::VocabId GetVocabId(const Factor *factor) const;
|
|
|
|
private:
|
|
LMResult GetValue(DALM::VocabId wid, DALM::State* finalState) const;
|
|
LMResult GetValue(const Word &word, DALM::State* finalState) const;
|
|
void updateChartScore(float *prefixScore, float *finalizedScore, float score, size_t wordPos) const;
|
|
|
|
// Convert last words of hypothesis into vocab ids, returning an end pointer.
|
|
DALM::VocabId *LastIDs(const Hypothesis &hypo, DALM::VocabId *indices) const {
|
|
DALM::VocabId *index = indices;
|
|
DALM::VocabId *end = indices + m_nGramOrder - 1;
|
|
int position = hypo.GetCurrTargetWordsRange().GetEndPos();
|
|
for (; ; ++index, --position) {
|
|
if (index == end) return index;
|
|
if (position == -1) {
|
|
*index = wid_start;
|
|
return index + 1;
|
|
}
|
|
*index = GetVocabId(hypo.GetWord(position).GetFactor(m_factorType));
|
|
}
|
|
}
|
|
};
|
|
|
|
}
|
|
|