PLearn 0.1
CompactVMatrixGaussianKernel.cc
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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 and University of Montreal
00006 //
00007 
00008 // Redistribution and use in source and binary forms, with or without
00009 // modification, are permitted provided that the following conditions are met:
00010 // 
00011 //  1. Redistributions of source code must retain the above copyright
00012 //     notice, this list of conditions and the following disclaimer.
00013 // 
00014 //  2. Redistributions in binary form must reproduce the above copyright
00015 //     notice, this list of conditions and the following disclaimer in the
00016 //     documentation and/or other materials provided with the distribution.
00017 // 
00018 //  3. The name of the authors may not be used to endorse or promote
00019 //     products derived from this software without specific prior written
00020 //     permission.
00021 // 
00022 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00023 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00024 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00025 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00026 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00027 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00028 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00029 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00030 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00031 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00032 // 
00033 // This file is part of the PLearn library. For more information on the PLearn
00034 // library, go to the PLearn Web site at www.plearn.org
00035  
00036 
00037 /* *******************************************************      
00038  * $Id: CompactVMatrixGaussianKernel.cc 3994 2005-08-25 13:35:03Z chapados $
00039  * This file is part of the PLearn library.
00040  ******************************************************* */
00041 
00042 #include "CompactVMatrixGaussianKernel.h"
00043 
00044 namespace PLearn {
00045 using namespace std;
00046 
00047 // ** CompactVMatrixGaussianKernel **
00048 
00049 PLEARN_IMPLEMENT_OBJECT(CompactVMatrixGaussianKernel, "ONE LINE DESCR", "NO HELP");
00050 
00051 real CompactVMatrixGaussianKernel::evaluate(const Vec& x1, const Vec& x2) const
00052 { 
00053     // return exp(-powdistance(x1, x2, 2.0)/(sigma*sigma)); 
00054     real sqdiff=0;
00055     if (m)
00056     {
00057         sqdiff=m->squareDifference(int(x1[0]),int(x2[0]));
00058 /*
00059   #ifdef BOUNDCHECK
00060   m->setNormalMode();
00061   int actual_n_inputs = m->width()-1;
00062   Vec actual_x1(actual_n_inputs);
00063   Vec actual_x2(actual_n_inputs);
00064   m->getRow(int(x1[0]),actual_x1);
00065   m->getRow(int(x2[0]),actual_x2);
00066   m->setIndicesMode();
00067   real actual_sqdiff= powdistance(actual_x1, actual_x2, 2.0);
00068   if (fabs(sqdiff-actual_sqdiff)>0.1)
00069   PLWARNING("something wrong in CompactVMatrixGaussianKernel");
00070   #endif
00071 */
00072     }
00073     else
00074         sqdiff= powdistance(x1, x2, real(2.0));
00075     return exp(-sqdiff/(sigma*sigma));
00076   
00077 }
00078 
00079 void CompactVMatrixGaussianKernel::setParameters(Vec paramvec)
00080 { sigma = paramvec[0]; }
00081 
00082 
00083 void CompactVMatrixGaussianKernel::declareOptions(OptionList &ol)
00084 {
00085     declareOption(ol, "sigma", &CompactVMatrixGaussianKernel::sigma, OptionBase::buildoption,
00086                   "TODO: Some comments");
00087     declareOption(ol, "m", &CompactVMatrixGaussianKernel::m, OptionBase::buildoption, "");
00088     inherited::declareOptions(ol);
00089 }
00090 
00091 } // end of namespace PLearn
00092 
00093 
00094 /*
00095   Local Variables:
00096   mode:c++
00097   c-basic-offset:4
00098   c-file-style:"stroustrup"
00099   c-file-offsets:((innamespace . 0)(inline-open . 0))
00100   indent-tabs-mode:nil
00101   fill-column:79
00102   End:
00103 */
00104 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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