EST_SCFG_Rule Class Reference

A stochastic context free grammar rule. More...

#include <include/EST_SCFG.h>

Public Member Functions
	EST_SCFG_Rule ()
	EST_SCFG_Rule (const EST_SCFG_Rule &r)
	EST_SCFG_Rule (double prob, int p, int m)
	Create a unary rule. More...
	EST_SCFG_Rule (double prob, int p, int q, int r)
	Create a binary rule. More...
double	prob () const
	The rule's probability. More...
void	set_prob (double p)
	set the probability More...
est_scfg_rtype	type () const
	rule type More...
int	mother () const
int	daughter1 () const
int	daughter2 () const
void	set_rule (double prob, int p, int m)
void	set_rule (double prob, int p, int q, int r)

Detailed Description

A stochastic context free grammar rule.

At present only two types of rule are supported: est\_scfg\_binary\_rule and est\_scfg\_unary\_rule. This is sufficient for the representation of grammars in Chomsky Normal Form. Each rule also has a probability associated with it. Terminals and noterminals are represented as ints using the EST_Discrete s in EST_SCFG to reference the actual alphabets.

Although this class includes a "probability" nothing in the rule itself enforces it to be a true probability. It is responsibility of the classes that use this rule to enforce that condition if desired.

Author

Alan W Black (awb@c.nosp@m.str..nosp@m.ed.ac.nosp@m..uk): October 1997

Definition at line 123 of file EST_SCFG.h.

Constructor & Destructor Documentation

EST_SCFG_Rule::EST_SCFG_Rule ( )

inline

Definition at line 132 of file EST_SCFG.h.

EST_SCFG_Rule::EST_SCFG_Rule ( const EST_SCFG_Rule &  r )

inline

Definition at line 135 of file EST_SCFG.h.

EST_SCFG_Rule::EST_SCFG_Rule	(	double	prob,
		int	p,
		int	m
	)

Create a unary rule.

Definition at line 46 of file EST_SCFG.cc.

EST_SCFG_Rule::EST_SCFG_Rule	(	double	prob,
		int	p,
		int	q,
		int	r
	)

Create a binary rule.

Definition at line 52 of file EST_SCFG.cc.

Member Function Documentation

double EST_SCFG_Rule::prob ( ) const

inline

The rule's probability.

Definition at line 143 of file EST_SCFG.h.

void EST_SCFG_Rule::set_prob ( double  p )

inline

set the probability

Definition at line 145 of file EST_SCFG.h.

est_scfg_rtype EST_SCFG_Rule::type ( ) const

inline

rule type

Definition at line 147 of file EST_SCFG.h.

int EST_SCFG_Rule::mother ( ) const

inline

Definition at line 149 of file EST_SCFG.h.

int EST_SCFG_Rule::daughter1 ( ) const

inline

In a unary rule this is a terminal, in a binary rule it is a nonterminal

Definition at line 153 of file EST_SCFG.h.

int EST_SCFG_Rule::daughter2 ( ) const

inline

Definition at line 155 of file EST_SCFG.h.

void EST_SCFG_Rule::set_rule	(	double	prob,
		int	p,
		int	m
	)

Definition at line 57 of file EST_SCFG.cc.

void EST_SCFG_Rule::set_rule	(	double	prob,
		int	p,
		int	q,
		int	r
	)

Definition at line 65 of file EST_SCFG.cc.

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

• include/EST_SCFG.h
• grammar/scfg/EST_SCFG.cc