PLearn 0.1
PolynomialKernel.h
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00001 // -*- C++ -*-
00002 
00003 // PLearn (A C++ Machine Learning Library)
00004 // Copyright (C) 1998 Pascal Vincent
00005 // Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio, Rejean Ducharme and University of Montreal
00006 // Copyright (C) 2001-2002 Nicolas Chapados, Ichiro Takeuchi, Jean-Sebastien Senecal
00007 // Copyright (C) 2002 Xiangdong Wang, Christian Dorion
00008 
00009 // Redistribution and use in source and binary forms, with or without
00010 // modification, are permitted provided that the following conditions are met:
00011 // 
00012 //  1. Redistributions of source code must retain the above copyright
00013 //     notice, this list of conditions and the following disclaimer.
00014 // 
00015 //  2. Redistributions in binary form must reproduce the above copyright
00016 //     notice, this list of conditions and the following disclaimer in the
00017 //     documentation and/or other materials provided with the distribution.
00018 // 
00019 //  3. The name of the authors may not be used to endorse or promote
00020 //     products derived from this software without specific prior written
00021 //     permission.
00022 // 
00023 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00024 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00025 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00026 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00027 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00028 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00029 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00030 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00031 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00032 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00033 // 
00034 // This file is part of the PLearn library. For more information on the PLearn
00035 // library, go to the PLearn Web site at www.plearn.org
00036 
00037 
00038 /* *******************************************************      
00039  * $Id: PolynomialKernel.h 6859 2007-04-09 18:07:57Z nouiz $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #ifndef PolynomialKernel_INC
00044 #define PolynomialKernel_INC
00045 
00046 #include "Kernel.h"
00047 
00048 namespace PLearn {
00049 using namespace std;
00050 
00051 class PolynomialKernel: public Kernel
00052 {
00053     typedef Kernel inherited;
00054 
00055 public:
00056 
00057     int n;
00058     real beta;
00059 
00060 public:
00061 
00063     PolynomialKernel();
00064 
00066     PolynomialKernel(int the_n, real the_beta = 1.0, bool call_build_ = true);
00067 
00068     PLEARN_DECLARE_OBJECT(PolynomialKernel);
00069 
00070     // Kernel methods.
00071 
00072     virtual real evaluate(const Vec& x1, const Vec& x2) const; 
00073     virtual real evaluate_i_j(int i, int j) const;
00074     virtual real evaluate_i_x(int i, const Vec& x, real squared_norm_of_x=-1) const;
00075     virtual real evaluate_x_i(const Vec& x, int i, real squared_norm_of_x=-1) const;
00076 
00077     // Object methods.
00078 
00079     // Simply calls inherited::build() then build_().
00080     virtual void build();
00081 
00083     virtual void makeDeepCopyFromShallowCopy(CopiesMap& copies);
00084 
00085 protected:
00086 
00088     inline real evaluateFromDot(real dot_product) const
00089     {
00090         return ipow(beta*dot_product + real(1.0), n);
00091     }
00092 
00094     static void declareOptions(OptionList &ol);  
00095 
00096 private:
00097 
00099     void build_();
00100 
00101 };
00102 
00103 DECLARE_OBJECT_PTR(PolynomialKernel);
00104 
00105 } // end of namespace PLearn
00106 
00107 #endif
00108 
00109 
00110 /*
00111   Local Variables:
00112   mode:c++
00113   c-basic-offset:4
00114   c-file-style:"stroustrup"
00115   c-file-offsets:((innamespace . 0)(inline-open . 0))
00116   indent-tabs-mode:nil
00117   fill-column:79
00118   End:
00119 */
00120 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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