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https://github.com/moses-smt/mosesdecoder.git
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103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
// $Id$
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#pragma once
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#include <vector>
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#include "Implementation.h"
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#include "moses/Hypothesis.h"
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namespace DALM
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{
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class Logger;
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class Vocabulary;
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class State;
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class LM;
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union Fragment;
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class Gap;
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typedef unsigned int VocabId;
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}
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namespace Moses
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{
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class Factor;
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class DALMChartState;
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class LanguageModelDALM : public LanguageModel
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{
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public:
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LanguageModelDALM(const std::string &line);
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virtual ~LanguageModelDALM();
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void Load(AllOptions::ptr const& opts);
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virtual const FFState *EmptyHypothesisState(const InputType &/*input*/) const;
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virtual void CalcScore(const Phrase &phrase, float &fullScore, float &ngramScore, size_t &oovCount) const;
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virtual FFState *EvaluateWhenApplied(const Hypothesis &hypo, const FFState *ps, ScoreComponentCollection *out) const;
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virtual FFState *EvaluateWhenApplied(const ChartHypothesis& hypo, int featureID, ScoreComponentCollection *out) const;
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virtual bool IsUseable(const FactorMask &mask) const;
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virtual void SetParameter(const std::string& key, const std::string& value);
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protected:
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const Factor *m_beginSentenceFactor;
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FactorType m_factorType;
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std::string m_filePath;
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size_t m_nGramOrder; //! max n-gram length contained in this LM
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size_t m_ContextSize;
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DALM::Logger *m_logger;
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DALM::Vocabulary *m_vocab;
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DALM::LM *m_lm;
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DALM::VocabId wid_start, wid_end;
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mutable std::vector<DALM::VocabId> m_vocabMap;
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void CreateVocabMapping(const std::string &wordstxt);
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DALM::VocabId GetVocabId(const Factor *factor) const;
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private:
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// Convert last words of hypothesis into vocab ids, returning an end pointer.
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DALM::VocabId *LastIDs(const Hypothesis &hypo, DALM::VocabId *indices) const {
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DALM::VocabId *index = indices;
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DALM::VocabId *end = indices + m_nGramOrder - 1;
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int position = hypo.GetCurrTargetWordsRange().GetEndPos();
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for (; ; ++index, --position) {
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if (index == end) return index;
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if (position == -1) {
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*index = wid_start;
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return index + 1;
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}
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*index = GetVocabId(hypo.GetWord(position).GetFactor(m_factorType));
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}
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}
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void EvaluateTerminal(
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const Word &word,
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float &hypoScore,
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DALMChartState *newState,
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DALM::State &state,
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DALM::Fragment *prefixFragments,
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unsigned char &prefixLength
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) const;
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void EvaluateNonTerminal(
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const Word &word,
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float &hypoScore,
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DALMChartState *newState,
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DALM::State &state,
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DALM::Fragment *prefixFragments,
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unsigned char &prefixLength,
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const DALMChartState *prevState,
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size_t prevTargetPhraseLength
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) const;
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};
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}
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