PLearn 0.1
DuplicateRowVariable.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: DuplicateRowVariable.cc 3994 2005-08-25 13:35:03Z chapados $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #include "ColumnSumVariable.h"
00044 #include "DuplicateRowVariable.h"
00045 //#include "Var_utils.h"
00046 
00047 namespace PLearn {
00048 using namespace std;
00049 
00050 
00053 PLEARN_IMPLEMENT_OBJECT(DuplicateRowVariable, "ONE LINE DESCR", "NO HELP");
00054 
00055 DuplicateRowVariable::DuplicateRowVariable(Variable* input, int thelength)
00056     : inherited(input, thelength, input->width()), length_(thelength)
00057 {
00058     build_();
00059 }
00060 
00061 void
00062 DuplicateRowVariable::build()
00063 {
00064     inherited::build();
00065     build_();
00066 }
00067 
00068 void
00069 DuplicateRowVariable::build_()
00070 {
00071     if (input && !input->isRowVec())
00072         PLERROR("In DuplicateRowVariable input is not a row");
00073 }
00074 
00075 void
00076 DuplicateRowVariable::declareOptions(OptionList &ol)
00077 {
00078     declareOption(ol, "length_", &DuplicateRowVariable::length_, OptionBase::buildoption, "");
00079     inherited::declareOptions(ol);
00080 }
00081 
00082 void DuplicateRowVariable::recomputeSize(int& l, int& w) const
00083 {
00084     l = length_;
00085     if (input)
00086         w = input->width();
00087     else
00088         w = 0;
00089 }
00090 
00091 void DuplicateRowVariable::fprop()
00092 {
00093     int k=0;
00094     for(int i=0; i<length(); i++)
00095         for(int j=0; j<width(); j++, k++)
00096             valuedata[k] = input->valuedata[j];
00097 }
00098 
00099 
00100 void DuplicateRowVariable::bprop()
00101 {
00102     int k=0;
00103     for(int i=0; i<length(); i++)
00104         for(int j=0; j<width(); j++, k++)
00105             input->gradientdata[j] += gradientdata[k];
00106 }
00107 
00108 
00109 void DuplicateRowVariable::symbolicBprop()
00110 {
00111     input->accg(columnSum(g));
00112 }
00113 
00114 
00115 
00116 } // end of namespace PLearn
00117 
00118 
00119 /*
00120   Local Variables:
00121   mode:c++
00122   c-basic-offset:4
00123   c-file-style:"stroustrup"
00124   c-file-offsets:((innamespace . 0)(inline-open . 0))
00125   indent-tabs-mode:nil
00126   fill-column:79
00127   End:
00128 */
00129 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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