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// $Id$
#pragma once
#include <vector>
#include "Implementation.h"
#include "moses/Hypothesis.h"
namespace DALM
{
class Logger;
class Vocabulary;
class State;
class LM;
union Fragment;
class Gap;
typedef unsigned int VocabId;
}
namespace Moses
{
class Factor;
class DALMChartState;
class LanguageModelDALM : public LanguageModel
{
public:
LanguageModelDALM(const std::string &line);
virtual ~LanguageModelDALM();
void Load(AllOptions::ptr const& opts);
virtual const FFState *EmptyHypothesisState(const InputType &/*input*/) const;
virtual void CalcScore(const Phrase &phrase, float &fullScore, float &ngramScore, size_t &oovCount) const;
virtual FFState *EvaluateWhenApplied(const Hypothesis &hypo, const FFState *ps, ScoreComponentCollection *out) const;
virtual FFState *EvaluateWhenApplied(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
size_t m_ContextSize;
DALM::Logger *m_logger;
DALM::Vocabulary *m_vocab;
DALM::LM *m_lm;
DALM::VocabId wid_start, wid_end;
mutable std::vector<DALM::VocabId> m_vocabMap;
void CreateVocabMapping(const std::string &wordstxt);
DALM::VocabId GetVocabId(const Factor *factor) const;
private:
// 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));
}
}
void EvaluateTerminal(
const Word &word,
float &hypoScore,
DALMChartState *newState,
DALM::State &state,
DALM::Fragment *prefixFragments,
unsigned char &prefixLength
) const;
void EvaluateNonTerminal(
const Word &word,
float &hypoScore,
DALMChartState *newState,
DALM::State &state,
DALM::Fragment *prefixFragments,
unsigned char &prefixLength,
const DALMChartState *prevState,
size_t prevTargetPhraseLength
) const;
};
}
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