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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_13) on Mon Jul 14 01:36:22 CEST 2008 --><TITLE>GeneticAlgorithm (RapidMiner Class Documentation)</TITLE><META NAME="keywords" CONTENT="com.rapidminer.operator.features.selection.GeneticAlgorithm class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="GeneticAlgorithm (RapidMiner Class Documentation)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/GeneticAlgorithm.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../../com/rapidminer/operator/features/selection/ForwardSelection.html" title="class in com.rapidminer.operator.features.selection"><B>PREV CLASS</B></A> <A HREF="../../../../../com/rapidminer/operator/features/selection/IterativeFeatureAdding.html" title="class in com.rapidminer.operator.features.selection"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../../index.html?com/rapidminer/operator/features/selection/GeneticAlgorithm.html" target="_top"><B>FRAMES</B></A> <A HREF="GeneticAlgorithm.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">com.rapidminer.operator.features.selection</FONT><BR>Class GeneticAlgorithm</H2><PRE>java.lang.Object <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../com/rapidminer/operator/Operator.html" title="class in com.rapidminer.operator">com.rapidminer.operator.Operator</A> <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../com/rapidminer/operator/OperatorChain.html" title="class in com.rapidminer.operator">com.rapidminer.operator.OperatorChain</A> <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../com/rapidminer/operator/features/FeatureOperator.html" title="class in com.rapidminer.operator.features">com.rapidminer.operator.features.FeatureOperator</A> <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../com/rapidminer/operator/features/selection/AbstractGeneticAlgorithm.html" title="class in com.rapidminer.operator.features.selection">com.rapidminer.operator.features.selection.AbstractGeneticAlgorithm</A> <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>com.rapidminer.operator.features.selection.GeneticAlgorithm</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../com/rapidminer/gui/wizards/ConfigurationListener.html" title="interface in com.rapidminer.gui.wizards">ConfigurationListener</A>, <A HREF="../../../../../com/rapidminer/gui/wizards/PreviewListener.html" title="interface in com.rapidminer.gui.wizards">PreviewListener</A>, <A HREF="../../../../../com/rapidminer/parameter/ParameterHandler.html" title="interface in com.rapidminer.parameter">ParameterHandler</A>, <A HREF="../../../../../com/rapidminer/tools/LoggingHandler.html" title="interface in com.rapidminer.tools">LoggingHandler</A></DD></DL><HR><DL><DT><PRE>public class <B>GeneticAlgorithm</B><DT>extends <A HREF="../../../../../com/rapidminer/operator/features/selection/AbstractGeneticAlgorithm.html" title="class in com.rapidminer.operator.features.selection">AbstractGeneticAlgorithm</A></DL></PRE><P>A genetic algorithm for feature selection (mutation=switch features on and off, crossover=interchange used features). Selection is done by roulette wheel. Genetic algorithms are general purpose optimization / search algorithms that are suitable in case of no or little problem knowledge. <br/> A genetic algorithm works as follows <ol> <li>Generate an initial population consisting of <code>population_size</code> individuals. Each attribute is switched on with probability <code>p_initialize</code></li> <li>For all individuals in the population <ul> <li>Perform mutation, i.e. set used attributes to unused with probability <code>p_mutation</code> and vice versa.</li> <li>Choose two individuals from the population and perform crossover with probability <code>p_crossover</code>. The type of crossover can be selected by <code>crossover_type</code>.</li> </ul> </li> <li>Perform selection, map all individuals to sections on a roulette wheel whose size is proportional to the individual's fitness and draw <code>population_size</code> individuals at random according to their probability.</li> <li>As long as the fitness improves, go to 2</li> </ol> If the example set contains value series attributes with blocknumbers, the whole block will be switched on and off.<P><P><DL><DT><B>Version:</B></DT> <DD>$Id: GeneticAlgorithm.java,v 1.7 2008/05/09 19:23:18 ingomierswa Exp $</DD><DT><B>Author:</B></DT> <DD>Ingo Mierswa, Simon Fischer</DD></DL><HR><P><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A>⌨️ 快捷键说明
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