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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Wed Sep 04 10:31:48 CDT 2002 --><TITLE>: Class AttributeSelection</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <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="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="../../weka/attributeSelection/AttributeEvaluator.html"><B>PREV CLASS</B></A> <A HREF="../../weka/attributeSelection/BestFirst.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="AttributeSelection.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">weka.attributeSelection</FONT><BR>Class AttributeSelection</H2><PRE>java.lang.Object | +--<B>weka.attributeSelection.AttributeSelection</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable</DD></DL><HR><DL><DT>public class <B>AttributeSelection</B><DT>extends java.lang.Object<DT>implements java.io.Serializable</DL><P>Attribute selection class. Takes the name of a search class and an evaluation class on the command line. <p> Valid options are: <p> -h <br> Display help. <p> -I <name of input file> <br> Specify the training arff file. <p> -C <class index> <br> The index of the attribute to use as the class. <p> -S <search method> <br> The full class name of the search method followed by search method options (if any).<br> Eg. -S "weka.attributeSelection.BestFirst -N 10" <p> -X <number of folds> <br> Perform a cross validation. <p> -N <random number seed> <br> Specify a random number seed. Use in conjuction with -X. (Default = 1). <p> ------------------------------------------------------------------------ <p> Example usage as the main of an attribute evaluator (called FunkyEvaluator): <code> <pre> public static void main(String [] args) { try { ASEvaluator eval = new FunkyEvaluator(); System.out.println(SelectAttributes(Evaluator, args)); } catch (Exception e) { System.err.println(e.getMessage()); } } </code> </pre> <p> ------------------------------------------------------------------------ <p><P><DL><DT><B>See Also: </B><DD><A HREF="../../serialized-form.html#weka.attributeSelection.AttributeSelection">Serialized Form</A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#AttributeSelection()">AttributeSelection</A></B>()</CODE><BR> constructor.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#CrossValidateAttributes()">CrossValidateAttributes</A></B>()</CODE><BR> Perform a cross validation for attribute selection.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#CVResultsString()">CVResultsString</A></B>()</CODE><BR> returns a string summarizing the results of repeated attribute selection runs on splits of a dataset.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#main(java.lang.String[])">main</A></B>(java.lang.String[] args)</CODE><BR> Main method for testing this class.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#numberAttributesSelected()">numberAttributesSelected</A></B>()</CODE><BR> Return the number of attributes selected from the most recent run of attribute selection</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> double[][]</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#rankedAttributes()">rankedAttributes</A></B>()</CODE><BR> get the final ranking of the attributes.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../weka/core/Instance.html">Instance</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#reduceDimensionality(weka.core.Instance)">reduceDimensionality</A></B>(<A HREF="../../weka/core/Instance.html">Instance</A> in)</CODE><BR> reduce the dimensionality of a single instance to include only those attributes chosen by the last run of attribute selection.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../weka/core/Instances.html">Instances</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#reduceDimensionality(weka.core.Instances)">reduceDimensionality</A></B>(<A HREF="../../weka/core/Instances.html">Instances</A> in)</CODE><BR> reduce the dimensionality of a set of instances to include only those attributes chosen by the last run of attribute selection.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#SelectAttributes(weka.attributeSelection.ASEvaluation, java.lang.String[])">SelectAttributes</A></B>(<A HREF="../../weka/attributeSelection/ASEvaluation.html">ASEvaluation</A> ASEvaluator, java.lang.String[] options)</CODE><BR> Perform attribute selection with a particular evaluator and a set of options specifying search method and input file etc.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#SelectAttributes(weka.attributeSelection.ASEvaluation, java.lang.String[], weka.core.Instances)">SelectAttributes</A></B>(<A HREF="../../weka/attributeSelection/ASEvaluation.html">ASEvaluation</A> ASEvaluator, java.lang.String[] options, <A HREF="../../weka/core/Instances.html">Instances</A> train)</CODE><BR> Perform attribute selection with a particular evaluator and a set of options specifying search method and options for the search method and evaluator.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#SelectAttributes(weka.core.Instances)">SelectAttributes</A></B>(<A HREF="../../weka/core/Instances.html">Instances</A> data)</CODE><BR> Perform attribute selection on the supplied training instances.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#selectAttributesCVSplit(weka.core.Instances)">selectAttributesCVSplit</A></B>(<A HREF="../../weka/core/Instances.html">Instances</A> split)</CODE><BR> Select attributes for a split of the data.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#selectedAttributes()">selectedAttributes</A></B>()</CODE><BR> get the final selected set of attributes.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#setEvaluator(weka.attributeSelection.ASEvaluation)">setEvaluator</A></B>(<A HREF="../../weka/attributeSelection/ASEvaluation.html">ASEvaluation</A> evaluator)</CODE><BR> set the attribute/subset evaluator</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#setFolds(int)">setFolds</A></B>(int folds)</CODE><BR> set the number of folds for cross validation</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#setRanking(boolean)">setRanking</A></B>(boolean r)</CODE><BR> produce a ranking (if possible with the set search and evaluator)</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#setSearch(weka.attributeSelection.ASSearch)">setSearch</A></B>(<A HREF="../../weka/attributeSelection/ASSearch.html">ASSearch</A> search)</CODE><BR> set the search method</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#setSeed(int)">setSeed</A></B>(int s)</CODE><BR> set the seed for use in cross validation</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#setThreshold(double)">setThreshold</A></B>(double t)</CODE><BR> set the threshold by which to select features from a ranked list</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#setXval(boolean)">setXval</A></B>(boolean x)</CODE><BR> do a cross validation</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.String</CODE></FONT></TD><TD><CODE><B><A HREF="../../weka/attributeSelection/AttributeSelection.html#toResultsString()">toResultsString</A></B>()</CODE><BR> get a description of the attribute selection</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.Object</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><A NAME="constructor_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Constructor Detail</B></FONT></TD></TR></TABLE><A NAME="AttributeSelection()"><!-- --></A><H3>AttributeSelection</H3><PRE>public <B>AttributeSelection</B>()</PRE><DL><DD>constructor. Sets defaults for each member varaible. Default attribute evaluator is CfsSubsetEval; default search method is BestFirst.</DL><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR>⌨️ 快捷键说明
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