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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 "WordsBitmap.h"
#include "WordsRange.h"
#include "Phrase.h"
#include "TargetPhrase.h"
#include "Hypothesis.h"
#include "Util.h"
#include "TypeDef.h"
#include "ScoreComponentCollection.h"
class PhraseDictionaryBase;
class GenerationDictionary;
/***
* Specify source and target words for a possible translation. m_targetPhrase points to a phrase-table entry.
* The source word range is zero-indexed, so it can't refer to an empty range. The target phrase may be empty.
*/
class TranslationOption
{
friend std::ostream& operator<<(std::ostream& out, const TranslationOption& possibleTranslation);
protected:
const Phrase m_phrase;
const WordsRange m_sourceWordsRange;
float m_scoreTrans, m_scoreGen, m_futureScore, m_ngramScore;
//! in TranslationOption, m_scoreBreakdown is not complete. It cannot,
//! for example, know the full n-gram score since the length of the
//! TargetPhrase may be shorter than the n-gram order. But, if it is
//! possible to estimate, it will be known
ScoreComponentCollection2 m_scoreBreakdown;
public:
TranslationOption(const WordsRange &wordsRange, const TargetPhrase &targetPhrase);
// used by initial translation step
TranslationOption(const TranslationOption ©, const TargetPhrase &targetPhrase);
// used by MergeTranslation
TranslationOption(const TranslationOption ©
, const Phrase &inputPhrase
, const GenerationDictionary *generationDictionary
, float generationScore
, float weight);
TranslationOption(const WordsRange &wordsRange, const TargetPhrase &targetPhrase, int /*whatever*/);
// used to create trans opt from unknown word
TranslationOption *MergeTranslation(const TargetPhrase &targetPhrase) const;
TranslationOption *MergeGeneration(const Phrase &inputPhrase
, const GenerationDictionary *generationDictionary
, float generationScore
, float weight) const;
inline const Phrase &GetTargetPhrase() const
{
return m_phrase;
}
inline const WordsRange &GetSourceWordsRange() const
{
return m_sourceWordsRange;
}
bool Overlap(const Hypothesis &hypothesis) const;
/***
* return start index of source phrase
*/
inline size_t GetStartPos() const
{
return m_sourceWordsRange.GetStartPos();
}
/***
* return end index of source phrase
*/
inline size_t GetEndPos() const
{
return m_sourceWordsRange.GetEndPos();
}
/***
* return length of source phrase
*/
inline size_t GetSize() const
{
return m_sourceWordsRange.GetEndPos() - m_sourceWordsRange.GetStartPos() + 1;
}
/***
* return source words range
*/
inline const WordsRange &GetWordsRange() const
{
return m_sourceWordsRange;
}
/***
* returns true if the source phrase translates into nothing
*/
inline float GetTranslationScore() const
{
return m_scoreTrans;
}
inline float GetGenerationScore() const
{
return m_scoreGen;
}
inline float GetFutureScore() const
{
return m_futureScore;
}
inline float GetNgramScore() const
{
return m_ngramScore;
}
inline float GetTotalScore() const
{
return m_scoreTrans + m_scoreGen + m_futureScore;
}
/***
* return target phrase
*/
inline const Phrase& GetPhrase() const
{
return m_phrase;
}
/***
* returns true if the source phrase translates into nothing
*/
inline bool IsDeletionOption() const
{
return m_phrase.GetSize() == 0;
}
void CalcScore(const LMList &allLM, float weightWordPenalty);
inline const ScoreComponentCollection2 &GetScoreBreakdown() const
{
return m_scoreBreakdown;
}
TO_STRING;
};
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