PLearn 0.1
RowSumVariable.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: RowSumVariable.cc 3994 2005-08-25 13:35:03Z chapados $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #include "RowSumVariable.h"
00044 
00045 namespace PLearn {
00046 using namespace std;
00047 
00048 
00051 PLEARN_IMPLEMENT_OBJECT(RowSumVariable,
00052                         "Result is a single column that contains the sum of each row of the input",
00053                         "NO HELP");
00054 
00055 RowSumVariable::RowSumVariable(Variable* input)
00056     : inherited(input, input->length(), 1)
00057 {}
00058 
00059 void RowSumVariable::recomputeSize(int& l, int& w) const
00060 {
00061     if (input)
00062         l = input->length();
00063     else
00064         l = 0;
00065     w=1;
00066 }
00067 
00068 void RowSumVariable::fprop()
00069 {
00070     value.clear();
00071     int k=0;
00072     for(int i=0; i<input->length(); i++)
00073         for(int j=0; j<input->width(); j++, k++)
00074             valuedata[i] += input->valuedata[k];
00075 }
00076 
00077 
00078 void RowSumVariable::bprop()
00079 {
00080     int k=0;
00081     for(int i=0; i<input->length(); i++)
00082         for(int j=0; j<input->width(); j++, k++)
00083             input->gradientdata[k] += gradientdata[i];
00084 }
00085 
00086 
00087 void RowSumVariable::symbolicBprop()
00088 {
00089     input->accg(g);
00090 }
00091 
00092 
00093 
00094 } // end of namespace PLearn
00095 
00096 
00097 /*
00098   Local Variables:
00099   mode:c++
00100   c-basic-offset:4
00101   c-file-style:"stroustrup"
00102   c-file-offsets:((innamespace . 0)(inline-open . 0))
00103   indent-tabs-mode:nil
00104   fill-column:79
00105   End:
00106 */
00107 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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