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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 <vector>
#include "Phrase.h"
#include "ScoreComponentCollection.h"
class LMList;
class PhraseDictionary;
class GenerationDictionary;
class ScoreProducer;
/** represents an entry on the target side of a phrase table (scores, translation)
*/
class TargetPhrase: public Phrase
{
friend std::ostream& operator<<(std::ostream&, const TargetPhrase&);
protected:
float m_transScore, m_ngramScore, m_fullScore;
//float m_ngramScore, m_fullScore;
ScoreComponentCollection m_scoreBreakdown;
// in case of confusion net, ptr to source phrase
Phrase const* m_sourcePhrase;
public:
TargetPhrase(FactorDirection direction=Output);
//! used by the unknown word handler- these targets
//! don't have a translation score, so wp is the only thing used
void SetScore();
//!Set score for Sentence XML target options
void SetScore(float score);
/*** Called immediately after creation to initialize scores.
*
* @param translationScoreProducer The PhraseDictionaryMemory that this TargetPhrase is contained by.
* Used to identify where the scores for this phrase belong in the list of all scores.
* @param scoreVector the vector of scores (log probs) associated with this translation
* @param weighT the weights for the individual scores (t-weights in the .ini file)
* @param languageModels all the LanguageModels that should be used to compute the LM scores
* @param weightWP the weight of the word penalty
*
* @TODO should this be part of the constructor? If not, add explanation why not.
*/
void SetScore(const ScoreProducer* translationScoreProducer,
const std::vector<float> &scoreVector,
const std::vector<float> &weightT,
float weightWP,
const LMList &languageModels);
// used when creating translations of unknown words:
void ResetScore();
void SetWeights(const ScoreProducer*, const std::vector<float> &weightT);
TargetPhrase *MergeNext(const TargetPhrase &targetPhrase) const;
// used for translation step
/* inline float GetTranslationScore() const
{
return m_transScore;
}*/
/***
* return the estimated score resulting from our being added to a sentence
* (it's an estimate because we don't have full n-gram info for the language model
* without using the (unknown) full sentence)
*
*/
inline float GetFutureScore() const
{
return m_fullScore;
}
inline const ScoreComponentCollection &GetScoreBreakdown() const
{
return m_scoreBreakdown;
}
//! TODO - why is this needed and is it set correctly by every phrase dictionary class ? should be set in constructor
void SetSourcePhrase(Phrase const* p)
{
m_sourcePhrase=p;
}
Phrase const* GetSourcePhrase() const
{
return m_sourcePhrase;
}
TO_STRING();
};
std::ostream& operator<<(std::ostream&, const TargetPhrase&);
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