PLearn 0.1
ScaledGeneralizedDistanceRBFKernel.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: ScaledGeneralizedDistanceRBFKernel.cc 6861 2007-04-09 19:04:15Z saintmlx $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #include "ScaledGeneralizedDistanceRBFKernel.h"
00044 
00045 namespace PLearn {
00046 using namespace std;
00047 
00048 
00049 PLEARN_IMPLEMENT_OBJECT(ScaledGeneralizedDistanceRBFKernel, "ONE LINE DESCR", "NO HELP");
00050 
00051 void ScaledGeneralizedDistanceRBFKernel::makeDeepCopyFromShallowCopy(CopiesMap& copies)
00052 {
00053     inherited::makeDeepCopyFromShallowCopy(copies);
00054     deepCopyField(phi, copies);
00055     deepCopyField(a, copies);
00056 }
00057 
00058 real ScaledGeneralizedDistanceRBFKernel::evaluate(const Vec& x1, const Vec& x2) const
00059 { 
00060 #ifdef BOUNDCHECK
00061     if(x1.length()!=x2.length())
00062         PLERROR("IN ScaledGeneralizedDistanceRBFKernel::evaluate x1 and x2 must have the same length");
00063 #endif
00064 
00065     real summ = 0.0;
00066     real* ph=phi.data();
00067     real* aa=a.data();
00068     for(int i=0; i<x1.length(); i++)
00069         summ += ph[i]*pow(fabs(pow(x1[i],aa[i])-pow(x2[i],aa[i])), (real)b);
00070     return exp(-pow(summ,c));
00071 }
00072 
00073 void ScaledGeneralizedDistanceRBFKernel::declareOptions(OptionList &ol)
00074 {
00075     declareOption(ol, "phi", &ScaledGeneralizedDistanceRBFKernel::phi, OptionBase::buildoption,
00076                   "TODO: Some comments");
00077     declareOption(ol, "a", &ScaledGeneralizedDistanceRBFKernel::phi, OptionBase::buildoption,
00078                   "TODO: Some comments");
00079     declareOption(ol, "b", &ScaledGeneralizedDistanceRBFKernel::phi, OptionBase::buildoption,
00080                   "TODO: Some comments");
00081     declareOption(ol, "c", &ScaledGeneralizedDistanceRBFKernel::phi, OptionBase::buildoption,
00082                   "TODO: Some comments");
00083     inherited::declareOptions(ol);
00084 }
00085 
00086 } // end of namespace PLearn
00087 
00088 
00089 /*
00090   Local Variables:
00091   mode:c++
00092   c-basic-offset:4
00093   c-file-style:"stroustrup"
00094   c-file-offsets:((innamespace . 0)(inline-open . 0))
00095   indent-tabs-mode:nil
00096   fill-column:79
00097   End:
00098 */
00099 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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