joshua.decoder.chart_parser.ManualConstraintsHandler Class Reference

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Classes
class	Span
Public Member Functions
	ManualConstraintsHandler (Chart chart, Grammar grammarForConstructManualRule, List< ConstraintSpan > constraintSpans)
List< Rule >	filterRules (int i, int j, List< Rule > rulesIn)
boolean	shouldSurvive (ConstraintRule cRule, Rule gRule)
boolean	containHardRuleConstraint (int startSpan, int endSpan)
Private Member Functions
void	initialize (List< ConstraintSpan > constraintSpans)
String	getSpanSignature (int i, int j)
Private Attributes
HashMap< String, ConstraintSpan >	constraintSpansForFiltering
ArrayList< Span >	spansWithHardRuleConstraint
Chart	chart
Grammar	grammarForConstructManualRule
Static Private Attributes
static final Logger	logger = Logger.getLogger(ManualConstraintsHandler.class.getName())

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Detailed Description

Author:

Zhifei Li, zhife.nosp@m.i.wo.nosp@m.rk@gm.nosp@m.ail..nosp@m.com

Version:

LastChangedDate:

2009-12-31 11:37:41 -0500

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Constructor & Destructor Documentation

joshua.decoder.chart_parser.ManualConstraintsHandler.ManualConstraintsHandler	(	Chart	chart,
		Grammar	grammarForConstructManualRule,
		List< ConstraintSpan >	constraintSpans
	)

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Member Function Documentation

boolean joshua.decoder.chart_parser.ManualConstraintsHandler.containHardRuleConstraint	(	int	startSpan,
		int	endSpan
	)

if a span is within the coverage of a hard rule constraint, then this span will be only allowed to use the mannual rules

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List<Rule> joshua.decoder.chart_parser.ManualConstraintsHandler.filterRules	(	int	i,
		int	j,
		List< Rule >	rulesIn
	)

if there are any LHS or RHS constraints for a span, then all the applicable grammar rules in that span will have to pass the filter.

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String joshua.decoder.chart_parser.ManualConstraintsHandler.getSpanSignature	(	int	i,
		int	j
	)		[private]

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void joshua.decoder.chart_parser.ManualConstraintsHandler.initialize

(

List< ConstraintSpan >

constraintSpans

)

[private]

Note that manual constraints or OOV handling is not part of seeding

(1) add manual rule (only allow flat rules) into the chart as constraints (2) add RHS or LHS constraint into constraintSpansForFiltering (3) add span signature into setOfSpansWithHardRuleConstraint; if the span contains a hard "RULE" constraint

Note that LHS and RHS constraints are always hard, while Rule constraint can be soft or hard

If the RULE constraint is hard, then we should filter all out all consituents (within this span), which are contructed from regular grammar

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boolean joshua.decoder.chart_parser.ManualConstraintsHandler.shouldSurvive	(	ConstraintRule	cRule,
		Rule	gRule
	)

should we filter out the gRule based on the manually provided constraint cRule

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Member Data Documentation

Chart joshua.decoder.chart_parser.ManualConstraintsHandler.chart [private]

HashMap<String, ConstraintSpan> joshua.decoder.chart_parser.ManualConstraintsHandler.constraintSpansForFiltering [private]

Grammar joshua.decoder.chart_parser.ManualConstraintsHandler.grammarForConstructManualRule [private]

final Logger joshua.decoder.chart_parser.ManualConstraintsHandler.logger = Logger.getLogger(ManualConstraintsHandler.class.getName()) [static, private]

ArrayList<Span> joshua.decoder.chart_parser.ManualConstraintsHandler.spansWithHardRuleConstraint [private]