PLearn 0.1
LaplacianKernel.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, 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: LaplacianKernel.cc 3994 2005-08-25 13:35:03Z chapados $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #include "LaplacianKernel.h"
00044 
00045 namespace PLearn {
00046 using namespace std;
00047 
00048 
00049 PLEARN_IMPLEMENT_OBJECT(LaplacianKernel, "ONE LINE DESCR", "NO HELP");
00050 
00051 real LaplacianKernel::evaluate(const Vec& x1, const Vec& x2) const
00052 { 
00053 #ifdef BOUNDCHECK
00054     if(x1.length()!=x2.length())
00055         PLERROR("IN LaplacianKernel::evaluate x1 and x2 must have the same length");
00056 #endif
00057 
00058     real summ = 0.0;
00059     real* v1=x1.data();
00060     real* v2=x2.data();
00061     int n=x1.length();
00062     for(int i=0; i<n; i++)
00063         summ += fabs(v1[i]-v2[i]);
00064     return exp(-phi*summ);
00065 }
00066 
00067 void LaplacianKernel::declareOptions(OptionList &ol)
00068 {
00069     declareOption(ol, "phi", &LaplacianKernel::phi, OptionBase::buildoption,
00070                   "TODO: Some comments");
00071     inherited::declareOptions(ol);
00072 }
00073 
00074 } // end of namespace PLearn
00075 
00076 
00077 /*
00078   Local Variables:
00079   mode:c++
00080   c-basic-offset:4
00081   c-file-style:"stroustrup"
00082   c-file-offsets:((innamespace . 0)(inline-open . 0))
00083   indent-tabs-mode:nil
00084   fill-column:79
00085   End:
00086 */
00087 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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