PLearn 0.1
DiagVariable.cc
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00001 // -*- C++ -*-
00002 
00003 // DiagVariable.cc
00004 //
00005 // Copyright (C) 2008 Pascal Vincent
00006 //
00007 // Redistribution and use in source and binary forms, with or without
00008 // modification, are permitted provided that the following conditions are met:
00009 // 
00010 //  1. Redistributions of source code must retain the above copyright
00011 //     notice, this list of conditions and the following disclaimer.
00012 // 
00013 //  2. Redistributions in binary form must reproduce the above copyright
00014 //     notice, this list of conditions and the following disclaimer in the
00015 //     documentation and/or other materials provided with the distribution.
00016 // 
00017 //  3. The name of the authors may not be used to endorse or promote
00018 //     products derived from this software without specific prior written
00019 //     permission.
00020 // 
00021 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00022 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00023 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00024 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00025 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00026 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00027 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00028 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00029 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00030 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00031 // 
00032 // This file is part of the PLearn library. For more information on the PLearn
00033 // library, go to the PLearn Web site at www.plearn.org
00034 
00035 // Authors: Pascal Vincent
00036 
00039 #include "DiagVariable.h"
00040 // #include "Var_operators.h"
00041 //#include "Var_utils.h"
00042 
00043 namespace PLearn {
00044 using namespace std;
00045 
00046 
00049 PLEARN_IMPLEMENT_OBJECT(
00050         DiagVariable,
00051         "Extracts the diagonal from a matrix source variable as a column vector.",
00052         "Resulting variable is a column vector."
00053 );
00054 
00056 // DiagVariable //
00058 
00059 DiagVariable::DiagVariable()
00060 {}
00061 
00062 DiagVariable::DiagVariable(Variable* input, bool call_build_):
00063     inherited(input, min(input->length(), input->width()), 1, call_build_)
00064 {
00065     if (call_build_)
00066         build_();
00067 }
00068 
00070 // build //
00072 void DiagVariable::build() {
00073     inherited::build();
00074     build_();
00075 }
00076 
00078 // build_ //
00080 void DiagVariable::build_() {
00081     // Nothing to do here.
00082 }
00083 
00085 // recomputeSize //
00087 void DiagVariable::recomputeSize(int& l, int& w) const
00088 {
00089     if (input) 
00090     {
00091         l = min(input->length(), input->width());
00092         w = 1;
00093     } 
00094     else
00095         l = w = 0;
00096 }
00097 
00098 
00099 void DiagVariable::fprop()
00100 {
00101     int l = value.length();
00102     Mat V = input->matValue;
00103     for(int i=0; i<l; i++)
00104         value[i] = V(i,i);
00105 }
00106 
00107 void DiagVariable::bprop()
00108 {
00109     int l = gradient.length();
00110     Mat G = input->matGradient;
00111     for(int i=0; i<l; i++)
00112         G(i,i) += gradient[i];
00113 }
00114 
00115 
00116 void DiagVariable::bbprop()
00117 {
00118     PLERROR("bbprop not implemented for this variable");
00119 }
00120 
00121 
00122 void DiagVariable::symbolicBprop()
00123 {
00124     PLERROR("symbolic bprop not yet implemented for this variable");
00125 }
00126 
00127 
00128 void DiagVariable::rfprop()
00129 {
00130     PLERROR("rfprop no yet implemented for this vairable");
00131 }
00132 
00133 
00134 
00135 } // end of namespace PLearn
00136 
00137 
00138 /*
00139   Local Variables:
00140   mode:c++
00141   c-basic-offset:4
00142   c-file-style:"stroustrup"
00143   c-file-offsets:((innamespace . 0)(inline-open . 0))
00144   indent-tabs-mode:nil
00145   fill-column:79
00146   End:
00147 */
00148 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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