Moses::TranslationOption Class Reference

#include <TranslationOption.h>

Collaboration diagram for Moses::TranslationOption:

List of all members.

Public Member Functions

TranslationOption (const WordsRange &wordsRange, const TargetPhrase &targetPhrase, const InputType &inputType)

TranslationOption (const WordsRange &wordsRange, const TargetPhrase &targetPhrase, const InputType &inputType, const UnknownWordPenaltyProducer *uwpProducer)

TranslationOption (const TranslationOption &copy)

TranslationOption (const TranslationOption &copy, const WordsRange &sourceWordsRange)

~TranslationOption ()

bool IsCompatible (const Phrase &phrase, const std::vector< FactorType > &featuresToCheck) const

void MergeNewFeatures (const Phrase &phrase, const ScoreComponentCollection &score, const std::vector< FactorType > &featuresToMerge)

const TargetPhrase & GetTargetPhrase () const

const WordsRange & GetSourceWordsRange () const

const Phrase * GetSourcePhrase () const

bool Overlap (const Hypothesis &hypothesis) const

size_t GetStartPos () const

size_t GetEndPos () const

size_t GetSize () const

float GetFutureScore () const

bool IsDeletionOption () const

const ScoreComponentCollection & GetScoreBreakdown () const

const Scores * GetCachedScores (const ScoreProducer *scoreProducer) const

void CalcScore (const TranslationSystem *system)

void CacheScores (const ScoreProducer &scoreProducer, const Scores &score)

TO_STRING ()

Protected Types

typedef std::map< const
ScoreProducer *, const Scores * > _ScoreCacheMap

Protected Attributes

TargetPhrase m_targetPhrase

Phrase * m_sourcePhrase

const WordsRange m_sourceWordsRange

float m_futureScore

ScoreComponentCollection m_scoreBreakdown

_ScoreCacheMap m_cachedScores

Friends

std::ostream & operator<< (std::ostream &out, const TranslationOption &possibleTranslation)

Detailed Description

Available phrase translation for a particular sentence pair. In a multi-factor model, this is expanded from the entries in the translation tables and generation tables (and pruned to the maximum number allowed). By pre-computing the allowable phrase translations, efficient beam search in Manager is possible when expanding instances of the class Hypothesis - the states in the search.

A translation option contains source and target phrase, aggregate and details scores (in m_scoreBreakdown), including an estimate how expensive this option will be in search (used to build the future cost matrix.)

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.

Definition at line 59 of file TranslationOption.h.

Member Typedef Documentation

typedef std::map<const ScoreProducer *, const Scores *> Moses::TranslationOption::_ScoreCacheMap [protected]

Definition at line 76 of file TranslationOption.h.

Constructor & Destructor Documentation

Moses::TranslationOption::TranslationOption	(	const WordsRange &	wordsRange,
		const TargetPhrase &	targetPhrase,
		const InputType &	inputType
	)

constructor. Used by initial translation step

Definition at line 38 of file TranslationOption.cpp.

References Moses::TargetPhrase::GetScoreBreakdown(), Moses::TargetPhrase::GetSourcePhrase(), Moses::InputType::GetSubString(), Moses::InputType::GetType(), m_scoreBreakdown, m_sourcePhrase, Moses::ScoreComponentCollection::PlusEquals(), and Moses::SentenceInput.

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Moses::TranslationOption::TranslationOption	(	const WordsRange &	wordsRange,
		const TargetPhrase &	targetPhrase,
		const InputType &	inputType,
		const UnknownWordPenaltyProducer *	uwpProducer
	)

constructor. Used to create trans opt from unknown word

Definition at line 57 of file TranslationOption.cpp.

References Moses::ScoreComponentCollection::Assign(), Moses::FloorScore(), Moses::TargetPhrase::GetScoreBreakdown(), Moses::TargetPhrase::GetSourcePhrase(), Moses::InputType::GetSubString(), Moses::InputType::GetType(), m_scoreBreakdown, m_sourcePhrase, Moses::ScoreComponentCollection::PlusEquals(), and Moses::SentenceInput.

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Moses::TranslationOption::TranslationOption ( const TranslationOption & copy )

copy constructor

Definition at line 84 of file TranslationOption.cpp.

Moses::TranslationOption::TranslationOption	(	const TranslationOption &	copy,
		const WordsRange &	sourceWordsRange
	)

copy constructor, but change words range. used by caching

Definition at line 94 of file TranslationOption.cpp.

Moses::TranslationOption::~TranslationOption ( ) [inline]

Definition at line 95 of file TranslationOption.h.

References m_cachedScores, and m_sourcePhrase.

Member Function Documentation

void Moses::TranslationOption::CacheScores	(	const ScoreProducer &	scoreProducer,
		const Scores &	score
	)

Definition at line 165 of file TranslationOption.cpp.

References m_cachedScores.

Referenced by Moses::TranslationOptionCollection::CacheLexReordering().

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void Moses::TranslationOption::CalcScore ( const TranslationSystem * system )

Calculate future score and n-gram score of this trans option, plus the score breakdowns

Definition at line 135 of file TranslationOption.cpp.

References Moses::LMList::CalcScore(), Moses::TranslationSystem::GetLanguageModels(), Moses::Phrase::GetSize(), GetTargetPhrase(), Moses::TranslationSystem::GetWeightWordPenalty(), Moses::ScoreComponentCollection::InnerProduct(), Moses::StaticData::Instance(), m_futureScore, and m_scoreBreakdown.

Referenced by Moses::PartialTranslOptColl::AddNoPrune(), Moses::TranslationOptionCollection::CreateTranslationOptionsForRange(), and Moses::TranslationOptionCollection::ProcessOneUnknownWord().

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const Scores* Moses::TranslationOption::GetCachedScores ( const ScoreProducer * scoreProducer ) const [inline]

returns cached scores

Definition at line 156 of file TranslationOption.h.

References m_cachedScores, and NULL.

Referenced by Moses::LexicalReorderingState::CopyScores().

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size_t Moses::TranslationOption::GetEndPos ( ) const [inline]

return end index of source phrase

Definition at line 131 of file TranslationOption.h.

References Moses::WordsRange::GetEndPos(), and m_sourceWordsRange.

Referenced by Moses::SearchNormal::ExpandHypothesis().

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float Moses::TranslationOption::GetFutureScore ( ) const [inline]

return estimate of total cost of this option

Definition at line 141 of file TranslationOption.h.

References m_futureScore.

Referenced by Moses::PartialTranslOptColl::AddNoPrune(), Moses::BackwardsEdge::BackwardsEdge(), Moses::Hypothesis::CalcExpectedScore(), Moses::TranslationOptionCollection::CalcFutureScore(), Moses::ComparePartialTranslationOption(), Moses::CompareTranslationOption(), Moses::SearchNormal::ExpandHypothesis(), Moses::operator<<(), and Moses::TranslationOptionCollection::Prune().

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const ScoreComponentCollection& Moses::TranslationOption::GetScoreBreakdown ( ) const [inline]

returns detailed component scores

Definition at line 151 of file TranslationOption.h.

References m_scoreBreakdown.

Referenced by Moses::Hypothesis::CalcExpectedScore(), Moses::Hypothesis::CalcScore(), and Moses::operator<<().

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size_t Moses::TranslationOption::GetSize ( ) const [inline]

return length of source phrase

Definition at line 136 of file TranslationOption.h.

References Moses::WordsRange::GetEndPos(), Moses::WordsRange::GetStartPos(), and m_sourceWordsRange.

Referenced by Moses::SearchNormal::ExpandHypothesis().

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const Phrase* Moses::TranslationOption::GetSourcePhrase ( ) const [inline]

returns source phrase

Definition at line 118 of file TranslationOption.h.

References m_sourcePhrase.

Referenced by Moses::TranslationOptionCollection::CacheLexReordering().

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const WordsRange& Moses::TranslationOption::GetSourceWordsRange ( ) const [inline]

returns source word range

Definition at line 113 of file TranslationOption.h.

References m_sourceWordsRange.

Referenced by Moses::TranslationOptionCollection::Add(), Moses::BackwardsEdge::BackwardsEdge(), Moses::HierarchicalReorderingForwardState::Expand(), Moses::HierarchicalReorderingBackwardState::Expand(), Moses::PhraseBasedReorderingState::Expand(), Moses::HierarchicalReorderingForwardState::HierarchicalReorderingForwardState(), Moses::operator<<(), Overlap(), Moses::DecodeStepTranslation::Process(), and Moses::Sentence::Read().

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size_t Moses::TranslationOption::GetStartPos ( ) const [inline]

return start index of source phrase

Definition at line 126 of file TranslationOption.h.

References Moses::WordsRange::GetStartPos(), and m_sourceWordsRange.

Referenced by Moses::SearchNormal::ExpandHypothesis().

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const TargetPhrase& Moses::TranslationOption::GetTargetPhrase ( ) const [inline]

returns target phrase

Definition at line 108 of file TranslationOption.h.

References m_targetPhrase.

Referenced by Moses::TranslationOptionCollection::CacheLexReordering(), CalcScore(), Moses::Hypothesis::Create(), Moses::operator<<(), Moses::DecodeStepTranslation::Process(), and Moses::DecodeStepGeneration::Process().

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bool Moses::TranslationOption::IsCompatible	(	const Phrase &	phrase,
		const std::vector< FactorType > &	featuresToCheck
	)			const

returns true if all feature types in featuresToCheck are compatible between the two phrases

Definition at line 117 of file TranslationOption.cpp.

References Moses::Phrase::IsCompatible(), and m_targetPhrase.

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bool Moses::TranslationOption::IsDeletionOption ( ) const [inline]

return true if the source phrase translates into nothing

Definition at line 146 of file TranslationOption.h.

References Moses::Phrase::GetSize(), and m_targetPhrase.

Referenced by Moses::Hypothesis::Hypothesis().

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void Moses::TranslationOption::MergeNewFeatures	(	const Phrase &	phrase,
		const ScoreComponentCollection &	score,
		const std::vector< FactorType > &	featuresToMerge
	)

used when precomputing (composing) translation options

Definition at line 104 of file TranslationOption.cpp.

References CHECK, Moses::Phrase::GetSize(), m_scoreBreakdown, m_targetPhrase, Moses::Phrase::MergeFactors(), and Moses::ScoreComponentCollection::PlusEquals().

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bool Moses::TranslationOption::Overlap ( const Hypothesis & hypothesis ) const

whether source span overlaps with those of a hypothesis

Definition at line 129 of file TranslationOption.cpp.

References GetSourceWordsRange(), Moses::Hypothesis::GetWordsBitmap(), and Moses::WordsBitmap::Overlap().

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Moses::TranslationOption::TO_STRING ( )

Friends And Related Function Documentation

std::ostream& operator<<	(	std::ostream &	out,
		const TranslationOption &	possibleTranslation
	)			`[friend]`

Member Data Documentation

_ScoreCacheMap Moses::TranslationOption::m_cachedScores [protected]

Definition at line 77 of file TranslationOption.h.

Referenced by CacheScores(), GetCachedScores(), and ~TranslationOption().

float Moses::TranslationOption::m_futureScore [protected]

Definition at line 68 of file TranslationOption.h.

Referenced by CalcScore(), and GetFutureScore().

ScoreComponentCollection Moses::TranslationOption::m_scoreBreakdown [protected]

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 is included here.

Definition at line 74 of file TranslationOption.h.

Referenced by CalcScore(), GetScoreBreakdown(), MergeNewFeatures(), and TranslationOption().

Phrase* Moses::TranslationOption::m_sourcePhrase [protected]

Definition at line 66 of file TranslationOption.h.

Referenced by GetSourcePhrase(), TranslationOption(), and ~TranslationOption().

const WordsRange Moses::TranslationOption::m_sourceWordsRange [protected]

Definition at line 67 of file TranslationOption.h.

Referenced by GetEndPos(), GetSize(), GetSourceWordsRange(), and GetStartPos().

TargetPhrase Moses::TranslationOption::m_targetPhrase [protected]

Definition at line 65 of file TranslationOption.h.

Referenced by GetTargetPhrase(), IsCompatible(), IsDeletionOption(), and MergeNewFeatures().

The documentation for this class was generated from the following files:

mosesdecoder/moses/src/TranslationOption.h
mosesdecoder/moses/src/TranslationOption.cpp


Public Member Functions
	TranslationOption (const WordsRange &wordsRange, const TargetPhrase &targetPhrase, const InputType &inputType)
	TranslationOption (const WordsRange &wordsRange, const TargetPhrase &targetPhrase, const InputType &inputType, const UnknownWordPenaltyProducer *uwpProducer)
	TranslationOption (const TranslationOption &copy)
	TranslationOption (const TranslationOption &copy, const WordsRange &sourceWordsRange)
	~TranslationOption ()
bool	IsCompatible (const Phrase &phrase, const std::vector< FactorType > &featuresToCheck) const
void	MergeNewFeatures (const Phrase &phrase, const ScoreComponentCollection &score, const std::vector< FactorType > &featuresToMerge)
const TargetPhrase &	GetTargetPhrase () const
const WordsRange &	GetSourceWordsRange () const
const Phrase *	GetSourcePhrase () const
bool	Overlap (const Hypothesis &hypothesis) const
size_t	GetStartPos () const
size_t	GetEndPos () const
size_t	GetSize () const
float	GetFutureScore () const
bool	IsDeletionOption () const
const ScoreComponentCollection &	GetScoreBreakdown () const
const Scores *	GetCachedScores (const ScoreProducer *scoreProducer) const
void	CalcScore (const TranslationSystem *system)
void	CacheScores (const ScoreProducer &scoreProducer, const Scores &score)
	TO_STRING ()
Protected Types
typedef std::map< const ScoreProducer , const Scores >	_ScoreCacheMap
Protected Attributes
TargetPhrase	m_targetPhrase
Phrase *	m_sourcePhrase
const WordsRange	m_sourceWordsRange
float	m_futureScore
ScoreComponentCollection	m_scoreBreakdown
_ScoreCacheMap	m_cachedScores
Friends
std::ostream &	operator<< (std::ostream &out, const TranslationOption &possibleTranslation)