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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 "LanguageModel.h"
#include "Phrase.h"
class FactorCollection;
class Factor;
//! Abstract class for for single factor LM
class LanguageModelSingleFactor : public LanguageModel
{
protected:
const Factor *m_sentenceStart, *m_sentenceEnd;
FactorType m_factorType;
LanguageModelSingleFactor(bool registerScore, ScoreIndexManager &scoreIndexManager);
public:
static State UnknownState;
virtual ~LanguageModelSingleFactor();
virtual bool Load(const std::string &filePath
, FactorType factorType
, float weight
, size_t nGramOrder) = 0;
LMType GetLMType() const
{
return SingleFactor;
}
bool Useable(const Phrase &phrase) const
{
return (phrase.GetSize()>0 && phrase.GetFactor(0, m_factorType) != NULL);
}
const Factor *GetSentenceStart() const
{
return m_sentenceStart;
}
const Factor *GetSentenceEnd() const
{
return m_sentenceEnd;
}
FactorType GetFactorType() const
{
return m_factorType;
}
float GetWeight() const
{
return m_weight;
}
void SetWeight(float weight)
{
m_weight = weight;
}
std::string GetScoreProducerDescription() const;
};
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