vita::evolution_strategy< T, SS, CS, RS > Class Template Reference

Defines the skeleton of the evolution, deferring some steps to client subclasses. More...

#include <evolution_strategy.h>

Public Member Functions
void	after_generation () const
	Work to be done at the end of a generation. More...
	evolution_strategy (population< T > &pop, evaluator< T > &eva, summary< T > *s)
void	init () const
	Initial setup performed before evolution starts. More...
void	log_strategy (unsigned, unsigned) const
	Evolution strategy specific log function (it's called by the evolution::log method). More...
bool	stop_condition () const
	Used to signal strategy specific stop conditions. More...

Static Public Member Functions
static environment	shape (const environment &env)
	Sets strategy-specific parameters. More...

Public Attributes
CS< T >	recombination
RS< T >	replacement
SS< T >	selection

Static Public Attributes
static constexpr bool	is_alps
static constexpr bool	is_de

Protected Attributes
population< T > &	pop_
summary< T > *	sum_

Detailed Description

template<class T, template< class > class SS, template< class > class CS, template< class > class RS>
class vita::evolution_strategy< T, SS, CS, RS >

Defines the skeleton of the evolution, deferring some steps to client subclasses.

Template Parameters

T	type of individual
SS	class containing the selection strategy
CS	class containing the recombination strategy
RS	class containing the replacement strategy

Selection, recombination and replacement are the main steps of evolution. In the literature a lot of different algorithms are described and many of them are implemented in Vita (not every combination is meaningful).

The user can choose, at compile time, how the evolution class should work via the evolution strategy class (or one of its specialization).

In other words the template method design pattern is used to "inject" selection, recombination and replacement methods specified by the evolution_strategy object into an evolution object.

Definition at line 46 of file evolution_strategy.h.

Constructor & Destructor Documentation

evolution_strategy()

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

vita::evolution_strategy< T, SS, CS, RS >::evolution_strategy ( population< T > &  pop, evaluator< T > &  eva, summary< T > *  s  )

inline

Definition at line 49 of file evolution_strategy.h.

Member Function Documentation

after_generation()

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

void vita::evolution_strategy< T, SS, CS, RS >::after_generation ( ) const

inline

Work to be done at the end of a generation.

Definition at line 70 of file evolution_strategy.h.

init()

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

void vita::evolution_strategy< T, SS, CS, RS >::init ( ) const

inline

Initial setup performed before evolution starts.

Definition at line 67 of file evolution_strategy.h.

log_strategy()

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

void vita::evolution_strategy< T, SS, CS, RS >::log_strategy ( unsigned  , unsigned    ) const

inline

Evolution strategy specific log function (it's called by the evolution::log method).

Definition at line 58 of file evolution_strategy.h.

shape()

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

static environment vita::evolution_strategy< T, SS, CS, RS >::shape ( const environment &  env )

inlinestatic

Sets strategy-specific parameters.

The default implementation doesn't change the user-specified environment. Some evolution strategies force parameters to specific values.

Definition at line 64 of file evolution_strategy.h.

stop_condition()

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

bool vita::evolution_strategy< T, SS, CS, RS >::stop_condition ( ) const

inline

Used to signal strategy specific stop conditions.

Definition at line 73 of file evolution_strategy.h.

Member Data Documentation

is_alps

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

constexpr bool vita::evolution_strategy< T, SS, CS, RS >::is_alps

staticconstexpr

Initial value:

=
    std::is_same<SS<T>, typename vita::selection::alps<T>>::value &&
    std::is_same<RS<T>, typename vita::replacement::alps<T>>::value

Definition at line 75 of file evolution_strategy.h.

is_de

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

constexpr bool vita::evolution_strategy< T, SS, CS, RS >::is_de

staticconstexpr

Initial value:

=
    std::is_same<CS<T>, typename vita::recombination::de<T>>::value

Definition at line 79 of file evolution_strategy.h.

pop_

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

population<T>& vita::evolution_strategy< T, SS, CS, RS >::pop_

protected

Definition at line 88 of file evolution_strategy.h.

recombination

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

CS<T> vita::evolution_strategy< T, SS, CS, RS >::recombination

Definition at line 84 of file evolution_strategy.h.

replacement

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

RS<T> vita::evolution_strategy< T, SS, CS, RS >::replacement

Definition at line 85 of file evolution_strategy.h.

selection

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

SS<T> vita::evolution_strategy< T, SS, CS, RS >::selection

Definition at line 83 of file evolution_strategy.h.

sum_

template<class T , template< class > class SS, template< class > class CS, template< class > class RS>

summary<T>* vita::evolution_strategy< T, SS, CS, RS >::sum_

protected

Definition at line 89 of file evolution_strategy.h.

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

• evolution_strategy.h