opencog::URECommons Class Reference

#include <URECommons.h>

Collaboration diagram for opencog::URECommons:

Public Member Functions
	URECommons (AtomSpace &as)
Handle	create_bindLink (Handle himplicant, bool is_quoted=false) throw (opencog::InvalidParamException)
bool	exists_in (Handle &hlink, Handle &h)
string	get_unique_name (Handle &h)
Handle	replace_nodes_with_varnode (Handle &himplication_link, Type t=VARIABLE_NODE)
Handle	change_node_types (Handle &h, map< Handle, Handle > &replacement_map)
void	get_root_links (Handle h, HandleSeq &parents)
template<class Type >
Type	tournament_select (map< Type, float > tfitnes_map)
float	tv_fitness (Handle h)

Public Attributes
const float	FITNESS_PARAM = 0.9

Private Attributes
AtomSpace &	_as

Detailed Description

Reusable functions in the PLN module

Definition at line 40 of file URECommons.h.

Constructor & Destructor Documentation

URECommons::URECommons

(

AtomSpace &

as

)

Definition at line 31 of file URECommons.cc.

Member Function Documentation

Handle URECommons::change_node_types	(	Handle &	h,
		map< Handle, Handle > &	replacement_map
	)

create a copy of the handle with a different variable name passed in

Parameters

var_uniq_var

map input

Definition at line 106 of file URECommons.cc.

References _as, opencog::AtomSpace::add_link(), opencog::AtomSpace::get_outgoing(), opencog::AtomSpace::get_TV(), opencog::AtomSpace::get_type(), opencog::LinkCast(), opencog::NodeCast(), and opencog::Atom::setTruthValue().

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Handle URECommons::create_bindLink	(	Handle	himplicant,
		bool	is_quoted = false
	)
throw	(	opencog::InvalidParamException
	)

creates a BindLink instance that could be passed to to PatternMatching module

Parameters

himplicant

- an implicant part of the BindLink must have a variable node.

Returns

- a Handle to the BindLink instance created

Definition at line 33 of file URECommons.cc.

References opencog::get_outgoing_nodes(), and opencog::LinkCast().

bool URECommons::exists_in	(	Handle &	hlink,
		Handle &	h
	)

checks if a handle already exists in a HandleSeq

Definition at line 86 of file URECommons.cc.

References _as, opencog::AtomSpace::get_outgoing(), and opencog::LinkCast().

void URECommons::get_root_links	(	Handle	h,
		HandleSeq &	parents
	)

Get top level parent of the handle

Returns

a Link or Handle::UNDEFINED if there is no

Definition at line 134 of file URECommons.cc.

References _as, and opencog::AtomSpace::get_incoming().

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string URECommons::get_unique_name

(

Handle &

h

)

Definition at line 76 of file URECommons.cc.

References _as, opencog::AtomSpace::get_incoming(), and opencog::AtomSpace::get_name().

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Handle URECommons::replace_nodes_with_varnode	(	Handle &	himplication_link,
		Type	t = VARIABLE_NODE
	)

create a copy of the given implicatoin link with unique variables

Definition at line 62 of file URECommons.cc.

References _as, opencog::AtomSpace::add_node(), change_node_types(), opencog::get_outgoing_nodes(), and get_unique_name().

template<class Type >

Type opencog::URECommons::tournament_select ( map< Type, float >  tfitnes_map )

inline

Randomly pick about half of the elements, and amongst those return the fittest (higher is better). If tfitness_map is empty, then return the default value (build with Type()).

Definition at line 91 of file URECommons.h.

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float URECommons::tv_fitness

(

Handle

h

)

Calculates fitness values in source_list_atom_space (or target_list_atom_space for the BC) using the formula

F = s^x * c^(2-x)

where s is strength,c is confidence and x is some fixed value

Parameters

h	- a handle

Returns

a fitness value

Definition at line 151 of file URECommons.cc.

References _as, FITNESS_PARAM, and opencog::AtomSpace::get_TV().

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Member Data Documentation

AtomSpace& opencog::URECommons::_as

private

Definition at line 41 of file URECommons.h.

const float opencog::URECommons::FITNESS_PARAM = 0.9

Definition at line 44 of file URECommons.h.

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

• opencog/rule-engine/URECommons.h
• opencog/rule-engine/URECommons.cc