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/***********************************************************************
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
***********************************************************************/
#ifndef moses_LanguageModelRandLM_h
#define moses_LanguageModelRandLM_h
#include <string>
#include <vector>
#include "Factor.h"
#include "Util.h"
#include "LM/SingleFactor.h"
#include "RandLM.h"
class randlm::RandLM;
namespace Moses
{
class Factor;
class Phrase;
// RandLM wrapper (single factor LM)
class LanguageModelRandLM : public LanguageModelPointerState
{
public:
LanguageModelRandLM()
: m_lm(0) {}
bool Load(const std::string &filePath, FactorType factorType, size_t nGramOrder);
virtual LMResult GetValue(const std::vector<const Word*> &contextFactor, State* finalState = NULL) const;
~LanguageModelRandLM() {
delete m_lm;
}
void CleanUpAfterSentenceProcessing() {
m_lm->clearCaches(); // clear caches
}
void InitializeBeforeSentenceProcessing() {
m_lm->initThreadSpecificData(); // Creates thread specific data iff
// compiled with multithreading.
}
protected:
std::vector<randlm::WordID> m_randlm_ids_vec;
randlm::RandLM* m_lm;
randlm::WordID m_oov_id;
void CreateFactors(FactorCollection &factorCollection);
randlm::WordID GetLmID( const std::string &str ) const;
randlm::WordID GetLmID( const Factor *factor ) const {
size_t factorId = factor->GetId();
return ( factorId >= m_randlm_ids_vec.size()) ? m_oov_id : m_randlm_ids_vec[factorId];
};
};
}
#endif
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