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// $Id$
/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2006 University of Edinburgh
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
***********************************************************************/
#pragma once
#include <string>
#include <vector>
#include "Factor.h"
#include "TypeDef.h"
#include "Util.h"
#include "LanguageModelSingleFactor.h"
class Factor;
class Phrase;
class lmtable; // irst lm table
class lmmacro; // irst lm for macro tags
class ngram;
/** Implementation of single factor LM using IRST's code.
* This is the default LM for Moses and is available from the same sourceforge repository
*/
class LanguageModelIRST : public LanguageModelSingleFactor
{
protected:
std::vector<int> m_lmIdLookup;
lmtable* m_lmtb;
ngram* m_lmtb_ng;
int m_unknownId;
int m_lmtb_sentenceStart; //lmtb symbols to initialize ngram with
int m_lmtb_sentenceEnd; //lmt symbol to initialize ngram with
int m_lmtb_size; //max ngram stored in the table
std::string m_mapFilePath;
// float GetValue(LmId wordId, ngram *context) const;
void CreateFactors(FactorCollection &factorCollection);
int GetLmID( const std::string &str ) const;
int GetLmID( const Factor *factor ) const{
size_t factorId = factor->GetId();
return ( factorId >= m_lmIdLookup.size()) ? m_unknownId : m_lmIdLookup[factorId];
};
public:
LanguageModelIRST(bool registerScore, ScoreIndexManager &scoreIndexManager);
~LanguageModelIRST();
bool Load(const std::string &filePath
, FactorType factorType
, float weight
, size_t nGramOrder);
virtual float GetValue(const std::vector<const Word*> &contextFactor, State* finalState = NULL, unsigned int* len=0) const;
void CleanUpAfterSentenceProcessing();
void InitializeBeforeSentenceProcessing();
};
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