PLearn 0.1
RationalQuadraticARDKernel.h
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00001 // -*- C++ -*-
00002 
00003 // RationalQuadraticARDKernel.h
00004 //
00005 // Copyright (C) 2006-2007 Nicolas Chapados
00006 //
00007 // Redistribution and use in source and binary forms, with or without
00008 // modification, are permitted provided that the following conditions are met:
00009 //
00010 //  1. Redistributions of source code must retain the above copyright
00011 //     notice, this list of conditions and the following disclaimer.
00012 //
00013 //  2. Redistributions in binary form must reproduce the above copyright
00014 //     notice, this list of conditions and the following disclaimer in the
00015 //     documentation and/or other materials provided with the distribution.
00016 //
00017 //  3. The name of the authors may not be used to endorse or promote
00018 //     products derived from this software without specific prior written
00019 //     permission.
00020 //
00021 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00022 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00023 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00024 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00025 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00026 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00027 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00028 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00029 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00030 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00031 //
00032 // This file is part of the PLearn library. For more information on the PLearn
00033 // library, go to the PLearn Web site at www.plearn.org
00034 
00035 // Authors: Nicolas Chapados
00036 
00040 #ifndef RationalQuadraticARDKernel_INC
00041 #define RationalQuadraticARDKernel_INC
00042 
00043 #include <plearn/ker/ARDBaseKernel.h>
00044 
00045 namespace PLearn {
00046 
00082 class RationalQuadraticARDKernel : public ARDBaseKernel
00083 {
00084     typedef ARDBaseKernel inherited;
00085 
00086 public:
00087     //#####  Public Build Options  ############################################
00088 
00091     mutable real m_isp_alpha;
00092 
00093 public:
00094     //#####  Public Member Functions  #########################################
00095 
00097     RationalQuadraticARDKernel();
00098 
00099 
00100     //#####  Kernel Member Functions  #########################################
00101 
00103     virtual real evaluate(const Vec& x1, const Vec& x2) const;
00104 
00107     virtual void evaluate_all_i_x(const Vec& x, const Vec& k_xi_x,
00108                                   real squared_norm_of_x=-1, int istart = 0) const;
00109 
00111     virtual void computeGramMatrix(Mat K) const;
00112 
00116     virtual void computeGramMatrixDerivative(Mat& KD, const string& kernel_param,
00117                                              real epsilon=1e-6) const;
00118     
00119 
00120     //#####  PLearn::Object Protocol  #########################################
00121 
00122     // Declares other standard object methods.
00123     PLEARN_DECLARE_OBJECT(RationalQuadraticARDKernel);
00124 
00125     // Simply calls inherited::build() then build_()
00126     virtual void build();
00127 
00129     virtual void makeDeepCopyFromShallowCopy(CopiesMap& copies);
00130 
00131 protected:
00133     static void declareOptions(OptionList& ol);
00134 
00136     real derivIspSignalSigma(int i, int j, int arg, real K) const;
00137 
00139     real derivIspGlobalSigma(int i, int j, int arg, real K) const;
00140     
00142     real derivIspInputSigma(int i, int j, int arg, real K) const;
00143     
00145     real derivIspAlpha(int i, int j, int arg, real K) const;
00146 
00147     // Compute derivative w.r.t. isp_signal_sigma for WHOLE MATRIX
00148     void computeGramMatrixDerivIspSignalSigma(Mat& KD) const;
00149     
00150     // Compute derivative w.r.t. isp_input_sigma[arg] for WHOLE MATRIX
00151     void computeGramMatrixDerivIspInputSigma(Mat& KD, int arg) const;
00152     
00153     // Compute derivative w.r.t. isp_alpha for WHOLE MATRIX
00154     void computeGramMatrixDerivIspAlpha(Mat& KD) const;
00155     
00156 protected:
00164     mutable Mat m_pow_minus_alpha_minus_1;
00165 
00166 private:
00168     void build_();
00169 };
00170 
00171 // Declares a few other classes and functions related to this class
00172 DECLARE_OBJECT_PTR(RationalQuadraticARDKernel);
00173 
00174 } // end of namespace PLearn
00175 
00176 #endif
00177 
00178 
00179 /*
00180   Local Variables:
00181   mode:c++
00182   c-basic-offset:4
00183   c-file-style:"stroustrup"
00184   c-file-offsets:((innamespace . 0)(inline-open . 0))
00185   indent-tabs-mode:nil
00186   fill-column:79
00187   End:
00188 */
00189 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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