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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
***********************************************************************/
#include "TranslationOption.h"
#include "WordsBitmap.h"
#include "PhraseDictionary.h"
#include "GenerationDictionary.h"
#include "LMList.h"
using namespace std;
TranslationOption::TranslationOption(const WordsRange &wordsRange, const TargetPhrase &targetPhrase)
: m_phrase(targetPhrase)
,m_sourceWordsRange (wordsRange)
{ // used by initial translation step
// set score
m_scoreGen = 0;
m_scoreTrans = targetPhrase.GetTranslationScore();
m_scoreBreakdown.PlusEquals(targetPhrase.GetScoreBreakdown());
}
TranslationOption::TranslationOption(const TranslationOption ©, const TargetPhrase &targetPhrase)
: m_phrase(targetPhrase)
,m_sourceWordsRange (copy.m_sourceWordsRange)
,m_scoreBreakdown(copy.m_scoreBreakdown)
{ // used in creating the next translation step
m_scoreGen = copy.GetGenerationScore();
m_scoreTrans = copy.GetTranslationScore() + targetPhrase.GetTranslationScore();
m_scoreBreakdown.PlusEquals(targetPhrase.GetScoreBreakdown());
}
TranslationOption::TranslationOption(const TranslationOption ©
, const Phrase &inputPhrase
, const GenerationDictionary *generationDictionary
, float generationScore
, float weight)
: m_phrase (inputPhrase)
, m_sourceWordsRange (copy.m_sourceWordsRange)
, m_scoreBreakdown(copy.m_scoreBreakdown)
{ // used in creating the next generation step
m_scoreTrans = copy.GetTranslationScore();
m_scoreGen = copy.GetGenerationScore() + generationScore * weight;
m_scoreBreakdown.PlusEquals(generationDictionary, generationScore);
}
TranslationOption::TranslationOption(const WordsRange &wordsRange, const TargetPhrase &targetPhrase, int /*whatever*/)
: m_phrase(targetPhrase)
,m_sourceWordsRange (wordsRange)
,m_scoreTrans(0)
,m_scoreGen(0)
,m_futureScore(0)
,m_ngramScore(0)
{ // used to create trans opt from unknown word
}
TranslationOption *TranslationOption::MergeTranslation(const TargetPhrase &targetPhrase) const
{
if (m_phrase.IsCompatible(targetPhrase))
{
TargetPhrase mergePhrase(targetPhrase);
mergePhrase.MergeFactors(m_phrase);
TranslationOption *newTransOpt = new TranslationOption(*this, mergePhrase);
return newTransOpt;
}
else
{
return NULL;
}
}
TranslationOption *TranslationOption::MergeGeneration(const Phrase &inputPhrase
, const GenerationDictionary *generationDictionary
, float generationScore
, float weight) const
{
if (m_phrase.IsCompatible(inputPhrase))
{
Phrase mergePhrase(inputPhrase);
mergePhrase.MergeFactors(m_phrase);
TranslationOption *newTransOpt = new TranslationOption(*this, mergePhrase, generationDictionary, generationScore, weight);
return newTransOpt;
}
else
return NULL;
}
bool TranslationOption::Overlap(const Hypothesis &hypothesis) const
{
const WordsBitmap &bitmap = hypothesis.GetWordsBitmap();
return bitmap.Overlap(GetSourceWordsRange());
}
void TranslationOption::CalcScore(const LMList &allLM, float weightWordPenalty)
{
// LM scores
m_ngramScore = 0;
float retFullScore = 0;
allLM.CalcScore(GetTargetPhrase(), retFullScore, m_ngramScore, &m_scoreBreakdown);
// future score
m_futureScore = retFullScore;
size_t phraseSize = GetTargetPhrase().GetSize();
m_futureScore += m_scoreTrans - phraseSize * weightWordPenalty;
}
TO_STRING_BODY(TranslationOption);
// friend
ostream& operator<<(ostream& out, const TranslationOption& possibleTranslation)
{
out << possibleTranslation.GetTargetPhrase()
<< ", pC=" << possibleTranslation.GetTranslationScore()
<< ", c=" << possibleTranslation.GetFutureScore()
<< " [" << possibleTranslation.GetSourceWordsRange() << "]"
<< possibleTranslation.GetScoreBreakdown();
return out;
}
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