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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 1.4.2_05) on Mon Mar 07 15:27:26 NZDT 2005 --><TITLE>CachedKernel</TITLE><META NAME="keywords" CONTENT="weka.classifiers.functions.supportVector.CachedKernel class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="CachedKernel";}</SCRIPT></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=3 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="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="../../../../../Tutorial.pdf"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="http://www.cs.waikato.ac.nz/ml/weka/index.html"><FONT CLASS="NavBarFont1"><B>Weka's home</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"> PREV CLASS <A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html" title="class in weka.classifiers.functions.supportVector"><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="CachedKernel.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 | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <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">weka.classifiers.functions.supportVector</FONT><BR>Class CachedKernel</H2><PRE>java.lang.Object <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html" title="class in weka.classifiers.functions.supportVector">weka.classifiers.functions.supportVector.Kernel</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>weka.classifiers.functions.supportVector.CachedKernel</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>java.io.Serializable</DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../weka/classifiers/functions/supportVector/PolyKernel.html" title="class in weka.classifiers.functions.supportVector">PolyKernel</A>, <A HREF="../../../../weka/classifiers/functions/supportVector/RBFKernel.html" title="class in weka.classifiers.functions.supportVector">RBFKernel</A></DD></DL><HR><DL><DT>public abstract class <B>CachedKernel</B><DT>extends <A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html" title="class in weka.classifiers.functions.supportVector">Kernel</A></DL><P>Base class for RBFKernel and PolyKernel that implements a simple LRU. (least-recently-used) cache if the cache size is set to a value > 0. Otherwise it uses a full cache.<P><P><DL><DT><B>Version:</B></DT> <DD>$$</DD><DT><B>Author:</B></DT> <DD>Eibe Frank (eibe@cs.waikato.ac.nz), Shane Legg (shane@intelligenesis.net) (sparse vector code), Stuart Inglis (stuart@reeltwo.com) (sparse vector code), J. Lindgren (jtlindgr{at}cs.helsinki.fi) (RBF kernel), Steven Hugg (hugg@fasterlight.com) (refactored, LRU cache), Bernhard Pfahringer (bernhard@cs.waikato.ac.nz) (full cache)</DD><DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html#weka.classifiers.functions.supportVector.CachedKernel">Serialized Form</A></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><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> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../weka/classifiers/functions/supportVector/CachedKernel.html#clean()">clean</A></B>()</CODE><BR> Frees the cache used by the kernel.</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/classifiers/functions/supportVector/CachedKernel.html#eval(int, int, weka.core.Instance)">eval</A></B>(int id1, int id2, <A HREF="../../../../weka/core/Instance.html" title="class in weka.core">Instance</A> inst1)</CODE><BR> Implements the abstract function of Kernel using the cache.</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/classifiers/functions/supportVector/CachedKernel.html#numCacheHits()">numCacheHits</A></B>()</CODE><BR> Returns the number of cache hits on dot products.</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/classifiers/functions/supportVector/CachedKernel.html#numEvals()">numEvals</A></B>()</CODE><BR> Returns the number of time Eval has been called.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from class java.lang.Object</B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE>equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR></TABLE><A NAME="eval(int, int, weka.core.Instance)"><!-- --></A><H3>eval</H3><PRE>public double <B>eval</B>(int id1, int id2, <A HREF="../../../../weka/core/Instance.html" title="class in weka.core">Instance</A> inst1) throws java.lang.Exception</PRE><DL><DD>Implements the abstract function of Kernel using the cache. This method uses the evaluate() method to do the actual dot product.<P><DD><DL><DT><B>Specified by:</B><DD><CODE><A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html#eval(int, int, weka.core.Instance)">eval</A></CODE> in class <CODE><A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html" title="class in weka.classifiers.functions.supportVector">Kernel</A></CODE></DL></DD><DD><DL><DT><B>Parameters:</B><DD><CODE>id1</CODE> - the index of the first instance in the dataset<DD><CODE>id2</CODE> - the index of the second instance in the dataset<DT><B>Returns:</B><DD>the result of the kernel function<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE></DL></DD></DL><HR><A NAME="numEvals()"><!-- --></A><H3>numEvals</H3><PRE>public int <B>numEvals</B>()</PRE><DL><DD>Returns the number of time Eval has been called.<P><DD><DL><DT><B>Specified by:</B><DD><CODE><A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html#numEvals()">numEvals</A></CODE> in class <CODE><A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html" title="class in weka.classifiers.functions.supportVector">Kernel</A></CODE></DL></DD><DD><DL><DT><B>Returns:</B><DD>the number of kernel evaluation.</DL></DD></DL><HR><A NAME="numCacheHits()"><!-- --></A><H3>numCacheHits</H3><PRE>public int <B>numCacheHits</B>()</PRE><DL><DD>Returns the number of cache hits on dot products.<P><DD><DL><DT><B>Specified by:</B><DD><CODE><A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html#numCacheHits()">numCacheHits</A></CODE> in class <CODE><A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html" title="class in weka.classifiers.functions.supportVector">Kernel</A></CODE></DL></DD><DD><DL><DT><B>Returns:</B><DD>the number of cache hits.</DL></DD></DL><HR><A NAME="clean()"><!-- --></A><H3>clean</H3><PRE>public void <B>clean</B>()</PRE><DL><DD>Frees the cache used by the kernel.<P><DD><DL><DT><B>Specified by:</B><DD><CODE><A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html#clean()">clean</A></CODE> in class <CODE><A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html" title="class in weka.classifiers.functions.supportVector">Kernel</A></CODE></DL></DD><DD><DL></DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ======= START OF BOTTOM NAVBAR ====== --><A NAME="navbar_bottom"><!-- --></A><A HREF="#skip-navbar_bottom" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_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="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="../../../../../Tutorial.pdf"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="http://www.cs.waikato.ac.nz/ml/weka/index.html"><FONT CLASS="NavBarFont1"><B>Weka's home</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"> PREV CLASS <A HREF="../../../../weka/classifiers/functions/supportVector/Kernel.html" title="class in weka.classifiers.functions.supportVector"><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="CachedKernel.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>'); 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