Added some explanations about the memory mangement (through eoFunctorStore)
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5 changed files with 266 additions and 86 deletions
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@ -2,7 +2,7 @@
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="GENERATOR" content="Mozilla/4.75 [en] (X11; U; Linux 2.2.17-21mdk i686) [Netscape]">
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<meta name="GENERATOR" content="Mozilla/4.78 [en] (X11; U; Linux 2.4.7-10 i686) [Netscape]">
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<title>Variation Operators</title>
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</head>
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<body text="#000000" link="#0000EF" vlink="#51188E" alink="#FF0000" background="beige009.jpg">
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@ -148,27 +148,27 @@ an eoQuad object.
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<br>Directly applying crossover operators is straightforward from the interface
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above:
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<br><tt><font color="#993300"><b>eoBinOpDerivedClass<Indi> myBinOp(parameters);
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</b>// use constructor to pass</font></tt>
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</b>//
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use constructor to pass</font></tt>
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<br><tt><font color="#993300"><b>eoQuadOpDerivedClass<Indi> myQuadOp(parameters);
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</b>//
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any useful argument</font></tt>
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<br><tt><font color="#993300"><b>Indi eo1= ..., eo2= ...; </b>//
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the candidates to crossover</font></tt>
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<br><b><tt><font color="#993300">if (myBinOp(eo1, eo2))</font></tt></b>
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<br><tt><font color="#993300"><b> { ...
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<br><tt><font color="#993300"><b> { ...
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</b>// eo1 has been modified, <b>not</b> eo2</font></tt>
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<br><b><tt><font color="#993300"> }</font></tt></b>
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<br><tt><font color="#993300"><b>else ...
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<br><tt><font color="#993300"><b>else ...
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</b>// none has been modified</font></tt>
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<br><b><tt><font color="#993300">if (myQuadOp(eo1, eo2))</font></tt></b>
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<br><tt><font color="#993300"><b> { ...
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<br><tt><font color="#993300"><b> { ...
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</b>// both eo1 and eo2 have been modified</font></tt>
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<br><b><tt><font color="#993300"> }</font></tt></b>
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<br><tt><font color="#993300"><b>else ...
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<br><tt><font color="#993300"><b>else ...
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</b>// none has been modified</font></tt>
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<p>However, you will hardly have to actually apply operators to individuals,
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@ -225,13 +225,12 @@ above:
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<br><tt><font color="#993300"><b>Indi eo = ...;
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/</b>/ eo is candidate to mutation</font></tt>
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<br><b><tt><font color="#993300">if (myMutation(eo))</font></tt></b>
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<br><tt><font color="#993300"><b> { ...
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</b>// eo has been modified</font></tt>
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<br><tt><font color="#993300"><b> { ... </b>//
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eo has been modified</font></tt>
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<br><b><tt><font color="#993300"> }</font></tt></b>
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<br><tt><font color="#993300"><b>else
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</b>// eo has not been modified</font></tt>
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<br><tt><font color="#993300"><b>else
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</b>//
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eo has not been modified</font></tt>
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<p>However, you will hardly have to actually apply operators to individuals,
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as operators are used within other classes, and are applied systematically
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to whole sets of individuals (e.g. that have already been selected, in
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@ -303,29 +302,47 @@ but rather through objects of type <a href="#general_combination">eoOpContainer<
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<p>This results in the following general interface for an <b><font color="#CC33CC">eoGenOp</font></b>:
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It receives as argument an <b><font color="#999900">eoPopulator</font></b>,
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gets the individuals it needs using the <b><tt><font color="#993300">operator*</font></tt></b>,
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and must handle the positinning of the using the <b><tt><font color="#993300">operator++</font></tt></b>
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method.
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and must handle the positinning of the using the <b><tt><font color="#993300">++operator</font></tt></b>
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method (<b><font color="#FF6600">Warning</font></b>: the <b><tt><font color="#993300">operator++</font></tt></b>
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method is not defined, as recommended by many good-programming-style books).
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<p><a NAME="apply"></a><b><tt><font color="#993300">bool apply()(</font><font color="#999900">eoPopulator</font><font color="#993300">&
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_pop)</font></tt></b>
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<br><b><tt><font color="#993300">{</font></tt></b>
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<br><tt><font color="#993300"><b> EOT& parent1 = *_pop;
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</b>//
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select the first parent</font></tt>
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<br><tt><font color="#993300"><b> ++_plop;
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</b>// advance once for each selected parents</font></tt>
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<br><tt><font color="#993300"><b> ++_plop;
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</b>//
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advance once for each selected parents</font></tt>
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<br><b><tt><font color="#993300"> ...</font></tt></b>
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<br><tt><font color="#993300"><b> EOT& parentN = *_pop;
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</b>//
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select the last parent</font></tt>
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<br><tt><font color="#993300"><b>
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</b>// don't advance after the last one: _plop always</font></tt>
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<br><tt><font color="#993300"><b> </b>//
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don't advance after the last one: _plop always</font></tt>
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<br><tt><font color="#993300">
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// points to the last that has already been treated</font></tt>
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<p><tt><font color="#993300">// do whatever the operator is supposed to
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do</font></tt>
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<br><b><tt><font color="#993300">}</font></tt></b>
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<p><b><font color="#FF6600">Warning</font></b>: as said above, an eoPopulator
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should always point to the last individual that has already been treated.
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This is because it is intended to be used within a loop that looks like
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(see e.g. <b><tt><a href="../../doc/html/classeo_general_breeder.html">eoBreeder</a></tt></b>
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class):
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<p><tt><font color="#993300"><b> eoSelectivePopulator<EOT>
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popit(_parents, _offspring, select);</b> // eoSelect
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is an eoSelectOne</font></tt>
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<br><b><tt><font color="#993300"> while (_offspring.size()
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< target)</font></tt></b>
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<br><b><tt><font color="#993300">
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{</font></tt></b>
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<br><b><tt><font color="#993300">
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op(popit);</font></tt></b>
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<br><b><tt><font color="#993300">
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++it;</font></tt></b>
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<br><b><tt><font color="#993300">
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}</font></tt></b>
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<p><b><font color="#FF6600">What happens next?</font></b> Well, it all
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depends on how many parents and how many offspring your general op needs:
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<ul>
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@ -340,9 +357,7 @@ were parents</font>, it needs to insert them into the list using the <b><tt><fon
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method of the class <b><font color="#999900">eoPopulator</font></b> as
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in the following:</li>
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<br>
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<p>
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<p><b><tt><font color="#993300">void apply()(</font><font color="#999900">eoPopulator</font><font color="#993300">&
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<p><br><b><tt><font color="#993300">void apply()(</font><font color="#999900">eoPopulator</font><font color="#993300">&
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_pop)</font></tt></b>
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<br><b><tt><font color="#993300">{</font></tt></b>
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<br><tt><font color="#993300"><b> </b>// get the necessary number
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@ -380,10 +395,8 @@ outside the curent list, so the total number of (intermediate) offspring
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is always equal to the initial population size. By chance, the <b><font color="#999900">eoPopulator</font></b>has
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a handle on the initial population that was used to start the process,
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and you can access it from inside the GenOp method. For instance</li>
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<br>
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<p>
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<p><b><tt><font color="#993300">void apply()(</font><font color="#999900">eoPopulator</font><font color="#993300">&
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<b><tt><font color="#993300"></font></tt></b>
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<p><br><b><tt><font color="#993300">void apply()(</font><font color="#999900">eoPopulator</font><font color="#993300">&
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_pop)</font></tt></b>
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<br><b><tt><font color="#993300">{</font></tt></b>
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<br><tt><font color="#993300"><b> </b>// get as many parents as you
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@ -414,8 +427,8 @@ If you don't care about the size of the offspring population (that is,
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if that size os controlled elsewhere, e.g. in some external loop), you
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can use the inbedded select method of the class <b><font color="#999900">eoPopulator</font></b>.
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For instance</li>
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<br><b><tt><font color="#993300">void apply()(</font><font color="#999900">eoPopulator</font><font color="#993300">&
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<b><tt><font color="#993300"></font></tt></b>
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<p><br><b><tt><font color="#993300">void apply()(</font><font color="#999900">eoPopulator</font><font color="#993300">&
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_pop)</font></tt></b>
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<br><b><tt><font color="#993300">{</font></tt></b>
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<br><tt><font color="#993300"><b> </b>// get as many parents as you
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@ -555,7 +568,8 @@ of parents, then you <b><font color="#FF6600">must</font></b> use an <b><font co
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to apply the variation operators to the population, and thus get exactly
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the number of offspring you want.
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<p><b><font color="#FF0000">Example</font></b>: An <b><font color="#CC33CC">eoSelectivePopulator</font></b>
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is the main ingredient of the <b><tt><font color="#FF6666">eoGeneralBreeder</font></tt></b><a href="../../doc/html/eogeneralbreeder_h-source.html#l00061">operator()
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is the main ingredient of the <b><tt><font color="#FF6666">eoGeneralBreeder
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</font></tt></b><a href="../../doc/html/eogeneralbreeder_h-source.html#l00061">operator()
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method</a> - a class that creates a population of offspring from the parents
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applying an eoGenOp (usually an eoOpContainer) to all selected parents
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in turn.
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@ -758,17 +772,21 @@ _pop)</font></tt></b>
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<br><b><tt><font color="#993300">{</font></tt></b>
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<br><tt><font color="#993300"><b> EOT & eo1 = *_pop; </b>// get
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(select if necessary) the first guy</font></tt>
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<br><b><tt><font color="#993300"> EOT & maBlonde = </font><font color="#009900">findBlonde</font><font color="#993300">(_pop.source());
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<br><b><tt><font color="#993300"> EOT maBlonde = </font><font color="#009900">findBlonde</font><font color="#993300">(_pop.source());
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</font></tt></b><tt><font color="#993300">//
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select mate</font></tt>
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<br><tt><font color="#993300"> // do whatever the operator is supposed
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to do</font></tt>
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to do, e.g</font></tt>
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<br><tt><font color="#993300"> <b>cross(eo1, maBonde);</b>
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// cross is some embedded crossover</font></tt>
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<br><tt><font color="#993300"> <b>...</b></font></tt>
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<br><tt><font color="#993300"> // if you want to put maBlonde into
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the offspring, you must</font></tt>
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<br><tt><font color="#993300"><b> ++_pop;
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</b>// advance</font></tt>
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<br><tt><font color="#993300"> // if you don't want to put maBlonde
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into the offspring,</font></tt>
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<br><tt><font color="#993300"> // stop here (and use a reference
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to maBlonde above). Otherwise</font></tt>
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<br><tt><font color="#993300"> <b>maBonde.invalidate();</b></font></tt>
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<br><tt><font color="#993300"><b> ++_pop; </b>//
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advance</font></tt>
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<br><tt><font color="#993300"> <b>_pop.insert(maBlonde);</b>
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// and insert it</font></tt>
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<br><b><tt><font color="#993300">}</font></tt></b>
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@ -776,7 +794,8 @@ the offspring, you must</font></tt>
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selector comes from? As usual, you have to attach it to the operator,
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in its constructor for instance, which should give something like:
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<p><b><tt><font color="#993300">sexualSelectorType<Indi> findBlonde;</font></tt></b>
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<br><b><tt><font color="#993300">sexualOperatorType<Indi> yourBrainAndMyBeauty(findBlonde);</font></tt></b>
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<br><b><tt><font color="#993300">sexualOperatorType<Indi> yourBrainAndMyBeauty(cross,
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findBlonde);</font></tt></b>
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<p>
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<hr WIDTH="100%"><b><font color="#FF0000">Local</font></b>: <a href="#introduction">Introduction</a>
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- <a href="#crossover">Crossover</a> - <a href="#mutation">Mutation</a>
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@ -790,10 +809,10 @@ documentation</a></font></font></b>
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<br>
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<hr>
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<address>
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<a href="mailto:Marc.Schoenauer@polytechnique.fr">Marc Schoenauer</a></address>
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<a href="mailto:Marc.Schoenauer@inria.fr">Marc Schoenauer</a></address>
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<br><!-- Created: Mon Oct 30 07:27:13 CET 2000 --><!-- hhmts start -->Last
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modified: Sat. Feb. 17 2001 <!-- hhmts end -->
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modified: Sat. Feb. 17 2002 <!-- hhmts end -->
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<br>
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</body>
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</html>
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