PLearn 0.1
DuplicateColumnVariable.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: DuplicateColumnVariable.cc 3994 2005-08-25 13:35:03Z chapados $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #include "DuplicateColumnVariable.h"
00044 #include "RowSumVariable.h"
00045 //#include "Var_utils.h"
00046 
00047 namespace PLearn {
00048 using namespace std;
00049 
00050 
00053 PLEARN_IMPLEMENT_OBJECT(DuplicateColumnVariable,
00054                         "ONE LINE DESCR",
00055                         "NO HELP");
00056 
00057 DuplicateColumnVariable::DuplicateColumnVariable(Variable* input, int thewidth)
00058     : inherited(input, input->length(), thewidth), width_(thewidth)
00059 {
00060     build_();
00061 }
00062 
00063 void
00064 DuplicateColumnVariable::build()
00065 {
00066     inherited::build();
00067     build_();
00068 }
00069 
00070 void
00071 DuplicateColumnVariable::build_()
00072 {
00073     if (input && !input->isColumnVec())
00074         PLERROR("In DuplicateColumnVariable input is not a column");
00075 }
00076 
00077 void
00078 DuplicateColumnVariable::declareOptions(OptionList &ol)
00079 {
00080     declareOption(ol, "width_", &DuplicateColumnVariable::width_, OptionBase::buildoption, "");
00081     inherited::declareOptions(ol);
00082 }
00083 
00084 void DuplicateColumnVariable::recomputeSize(int& l, int& w) const
00085 {
00086     if (input)
00087         l = input->length();
00088     else
00089         l = 0;
00090     w = width_;
00091 }
00092 
00093 void DuplicateColumnVariable::fprop()
00094 {
00095     int k=0;
00096     for(int i=0; i<length(); i++)
00097         for(int j=0; j<width(); j++, k++)
00098             valuedata[k] = input->valuedata[i];
00099 }
00100 
00101 
00102 void DuplicateColumnVariable::bprop()
00103 {
00104     int k=0;
00105     for(int i=0; i<length(); i++)
00106         for(int j=0; j<width(); j++, k++)
00107             input->gradientdata[i] += gradientdata[k];
00108 }
00109 
00110 
00111 void DuplicateColumnVariable::symbolicBprop()
00112 {
00113     input->accg(rowSum(g));
00114 }
00115 
00116 
00117 } // end of namespace PLearn
00118 
00119 
00120 /*
00121   Local Variables:
00122   mode:c++
00123   c-basic-offset:4
00124   c-file-style:"stroustrup"
00125   c-file-offsets:((innamespace . 0)(inline-open . 0))
00126   indent-tabs-mode:nil
00127   fill-column:79
00128   End:
00129 */
00130 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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