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svm(支持向量机)分类算法本质上是二类分类器

<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px"><P>
<TT>                  svm_classify example3/train.dat example3/model example3/predictions.train </TT></P></BLOCKQUOTE>

<P>Again, the predictions file shows the ordering implied by the model. The model ranks all training examples correctly. </P><P>Note that ranks are comparable only between examples with the same qid. Note also that the target value (first value in each line of the data files) is only used to define the order of the examples. Its absolute value does not matter, as long as the ordering relative to the other examples with the same qid remains the same.</P>


<H2>Extensions and Additions</H2>

<UL>
<LI><a TARGET="_top" HREF="javascript:if(confirm('http://ai-nlp.info.uniroma2.it/moschitti/  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://ai-nlp.info.uniroma2.it/moschitti/'" tppabs="http://ai-nlp.info.uniroma2.it/moschitti/">Tree Kernels</a>: kernel for classifying trees with SVM<I><SUP>light</I></SUP> written by <a TARGET="_top" HREF="javascript:if(confirm('http://ai-nlp.info.uniroma2.it/moschitti/  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://ai-nlp.info.uniroma2.it/moschitti/'" tppabs="http://ai-nlp.info.uniroma2.it/moschitti/">Alessandro Moschitti</a> </LI>

<LI><a TARGET="_top" HREF="javascript:if(confirm('http://search.cpan.org/~kwilliams/Algorithm-SVMLight/lib/Algorithm/SVMLight.pm  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://search.cpan.org/~kwilliams/Algorithm-SVMLight/lib/Algorithm/SVMLight.pm'" tppabs="http://search.cpan.org/~kwilliams/Algorithm-SVMLight/lib/Algorithm/SVMLight.pm">PERL Interface</a>: a PERL interface to SVM<I><SUP>light</I></SUP> written by <a TARGET="_top" HREF="mailto:[e-mail]">Ken Williams</a> </LI>

<LI><a TARGET="_top" HREF="javascript:if(confirm('http://www.cis.tugraz.at/igi/aschwaig/software.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.cis.tugraz.at/igi/aschwaig/software.html'" tppabs="http://www.cis.tugraz.at/igi/aschwaig/software.html">Matlab Interface</a>: a MATLAB interface to SVM<I><SUP>light</I></SUP> written by <a TARGET="_top" HREF="javascript:if(confirm('http://www.cis.tugraz.at/igi/aschwaig/index.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.cis.tugraz.at/igi/aschwaig/index.html'" tppabs="http://www.cis.tugraz.at/igi/aschwaig/index.html">Anton Schwaighofer</a> (for <A HREF="javascript:if(confirm('http://svmlight.joachims.org/old/svm_light_v4.00.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://svmlight.joachims.org/old/svm_light_v4.00.html'" tppabs="http://svmlight.joachims.org/old/svm_light_v4.00.html">SVM<I><SUP>light</SUP> </I> V4.00</a>) </LI>
  
<LI><a TARGET="_top" HREF="javascript:if(confirm('http://www.ship.edu/~thb/mexsvm/  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.ship.edu/~thb/mexsvm/'" tppabs="http://www.ship.edu/~thb/mexsvm/">Matlab Interface</a>: a MATLAB MEX-interface to SVM<I><SUP>light</I></SUP> written by <a TARGET="_top" HREF="javascript:if(confirm('http://www.ship.edu/~thb/  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www.ship.edu/~thb/'" tppabs="http://www.ship.edu/~thb/">Tom Briggs</a></LI>
  
<LI><a TARGET="_top" HREF="javascript:if(confirm('http://www-cad.eecs.berkeley.edu/~hwawen/research/projects/jsvm/doc/manual/index.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www-cad.eecs.berkeley.edu/~hwawen/research/projects/jsvm/doc/manual/index.html'" tppabs="http://www-cad.eecs.berkeley.edu/~hwawen/research/projects/jsvm/doc/manual/index.html">jSVM</a>: a JAVA interface to SVM<I><SUP>light</I></SUP> written by <a TARGET="_top" HREF="javascript:if(confirm('http://www-cad.eecs.berkeley.edu/~hwawen/  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www-cad.eecs.berkeley.edu/~hwawen/'" tppabs="http://www-cad.eecs.berkeley.edu/~hwawen/">Heloise Hwawen Hse</a> (for <A HREF="javascript:if(confirm('http://www-ai.cs.uni-dortmund.de/SOFTWARE/SVM_LIGHT/svm_light_v2.01.eng.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www-ai.cs.uni-dortmund.de/SOFTWARE/SVM_LIGHT/svm_light_v2.01.eng.html'" tppabs="http://www-ai.cs.uni-dortmund.de/SOFTWARE/SVM_LIGHT/svm_light_v2.01.eng.html">SVM<I><SUP>light</I></SUP> V2.01</A>) </LI> 
  
<LI>A <a href="javascript:if(confirm('http://sourceforge.net/project/showfiles.php?group_id=16036  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://sourceforge.net/project/showfiles.php?group_id=16036'" tppabs="http://sourceforge.net/project/showfiles.php?group_id=16036">special version of SVM<I><SUP>light</SUP> </I></a> is integrated into the virtual file system <a href="javascript:if(confirm('http://witme.sourceforge.net/libferris.web/  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://witme.sourceforge.net/libferris.web/'" tppabs="http://witme.sourceforge.net/libferris.web/">libferris</a> by Ben Martin </LI>
</UL>


<H2>Questions and Bug Reports</H2>

<P>If you find bugs or you have problems with the code you cannot solve by yourself, please contact me via email &lt;<A href="mailto:[e-mail]">[e-mail]</A>. </P>


<H2>Disclaimer</H2>

<P>This software is free only for non-commercial use. It must not be distributed without prior permission of the author. The author is not responsible for implications from the use of this software. </P>


<H2>History</H2>

<H4>V6.00 - V6.01</H4>
<UL>
<LI>Small bug fixes in HIDEO optimizer.
</UL>

<H4>V5.00 - V6.00</H4>
<UL>
<LI>Allows restarts from a particular vector of dual variables (option y).
<LI>Time out for exceeding number of iterations without progress (option #).
<LI>Allows the use of Kernels for learning ranking functions.
<LI>Support for non-vectorial data like strings.
<LI>Improved robustness and convergence especially for regression problems.
<LI>Cleaned up code, which makes it easier to integrate it into other programs.
<LI>Interface to SVM<I><SUP>struct</SUP></I>.
<LI>Source code for <A HREF="svm_light_v5.00.html" tppabs="http://www.cs.cornell.edu/People/tj/svm%5Flight/old/svm_light_v5.00.html">SVM<I><SUP>light</I></SUP> V5.00</A></LI>
</UL>

<H4>V4.00 - V5.00</H4>
<UL>
<LI>Can now solve ranking problems in addition to classification and regression.
<LI>Fixed bug in kernel cache that could lead to segmentation fault on some platforms.
<LI>Fixed bug in transductive SVM that was introduced in version V4.00.
<LI>Improved robustness.</LI>
<LI>Source code for <A HREF="svm_light_v4.00.html" tppabs="http://www.cs.cornell.edu/People/tj/svm%5Flight/old/svm_light_v4.00.html">SVM<I><SUP>light</I></SUP> V4.00</A></LI>
</UL>

<H4>V3.50 - V4.00</H4>
<UL>
<LI>Can now solve regression problems in addition to classification. 
<LI>Bug fixes and improved numerical stability. </LI>
<LI>Source code for <A HREF="svm_light_v3.50.html" tppabs="http://www.cs.cornell.edu/People/tj/svm%5Flight/old/svm_light_v3.50.html">SVM<I><SUP>light</I></SUP> V3.50</A></LI>
</UL>      

<H4>V3.02 - V3.50</H4>
<UL>
<LI>Computes XiAlpha estimates of the error rate, the precision, and the recall. 
<LI>Efficiently computes Leave-One-Out estimates of the error rate, the precision, and the recall. 
<LI>Improved Hildreth and D'Espo optimizer especially for low-dimensional data sets. 
<LI>Easier to link into other C and C++ code. Easier compilation under Windows. 
<LI>Faster classification of new examples for linear SVMs. </LI>
</UL>

<H4>V3.01 - V3.02</H4>
<UL>
<LI>Now examples can be read in correctly on SGIs. </LI>
</UL>

<H4>V3.00 - V3.01</H4>
<UL>
<LI>Fixed convergence bug for Hildreth and D'Espo solver. </LI>
</UL>

<H4>V2.01 - V3.00</H4>
<UL>
<LI>Training algorithm for transductive Support Vector Machines. 
<LI>Integrated core QP-solver based on the method of Hildreth and D'Espo. 
<LI>Uses folding in the linear case, which speeds up linear SVM training by an order of magnitude. 
<LI>Allows linear cost models. 
<LI>Faster in general. </LI>
</UL>

<H4>V2.00 - V2.01</H4>
<UL>
<LI>Improved interface to PR_LOQO 
<LI>Source code for <A HREF="javascript:if(confirm('http://www-ai.cs.uni-dortmund.de/SOFTWARE/SVM_LIGHT/svm_light_v2.01.eng.html  \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address.  \n\nDo you want to open it from the server?'))window.location='http://www-ai.cs.uni-dortmund.de/SOFTWARE/SVM_LIGHT/svm_light_v2.01.eng.html'" tppabs="http://www-ai.cs.uni-dortmund.de/SOFTWARE/SVM_LIGHT/svm_light_v2.01.eng.html">SVM<I><SUP>light</I></SUP> V2.01</A>      </LI>
</UL>

<H4>V1.00 - V2.00</H4>
<UL>
<LI>Learning is much faster especially for large training sets. 
<LI>Working set selection based on steepest feasible descent. 
<LI>"Shrinking" heuristic. 
<LI>Improved caching. 
<LI>New solver for intermediate QPs.