PLearn 0.1
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00001 00002 // -*- C++ -*- 00003 00004 // PLearn (A C++ Machine Learning Library) 00005 // Copyright (C) 1998 Pascal Vincent 00006 // Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio, Rejean Ducharme and University of Montreal 00007 // Copyright (C) 2001-2002 Nicolas Chapados, Ichiro Takeuchi, Jean-Sebastien Senecal 00008 // Copyright (C) 2002 Xiangdong Wang, Christian Dorion 00009 00010 // Redistribution and use in source and binary forms, with or without 00011 // modification, are permitted provided that the following conditions are met: 00012 // 00013 // 1. Redistributions of source code must retain the above copyright 00014 // notice, this list of conditions and the following disclaimer. 00015 // 00016 // 2. Redistributions in binary form must reproduce the above copyright 00017 // notice, this list of conditions and the following disclaimer in the 00018 // documentation and/or other materials provided with the distribution. 00019 // 00020 // 3. The name of the authors may not be used to endorse or promote 00021 // products derived from this software without specific prior written 00022 // permission. 00023 // 00024 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 00025 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00026 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 00027 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00028 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 00029 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00030 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00031 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00032 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00033 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00034 // 00035 // This file is part of the PLearn library. For more information on the PLearn 00036 // library, go to the PLearn Web site at www.plearn.org 00037 00038 00039 /* ******************************************************* 00040 * $Id: PlusVariable.cc 7420 2007-05-29 20:06:30Z simonl $ 00041 * This file is part of the PLearn library. 00042 ******************************************************* */ 00043 00044 #include "PlusVariable.h" 00045 00046 namespace PLearn { 00047 using namespace std; 00048 00051 PLEARN_IMPLEMENT_OBJECT(PlusVariable, 00052 "Adds 2 matrix vars of same size", 00053 "NO HELP"); 00054 00055 PlusVariable::PlusVariable(Variable* input1, Variable* input2) 00056 : inherited(input1, input2, input1->length(), input1->width()) 00057 { 00058 build_(); 00059 } 00060 00061 void 00062 PlusVariable::build() 00063 { 00064 inherited::build(); 00065 build_(); 00066 } 00067 00068 void 00069 PlusVariable::build_() 00070 { 00071 if (input1 && input2) { 00072 if(input1->size() != input2->size()) 00073 PLERROR("In PlusVariable: input1 and input2 must have exactly the same size (%ix%i != %ix%i)", input1->length(), input1->width(), input2->length(), input2->width()); 00074 } 00075 } 00076 00077 00078 void PlusVariable::recomputeSize(int& l, int& w) const 00079 { 00080 if (input1) { 00081 l = input1->length(); 00082 w = input1->width(); 00083 } else 00084 l = w = 0; 00085 } 00086 00087 void PlusVariable::fprop() 00088 { 00089 for(int k=0; k<nelems(); k++) 00090 valuedata[k] = input1->valuedata[k]+input2->valuedata[k]; 00091 } 00092 00093 00094 void PlusVariable::bprop() 00095 { 00096 for(int k=0; k<nelems(); k++) 00097 { 00098 input1->gradientdata[k] += gradientdata[k]; 00099 input2->gradientdata[k] += gradientdata[k]; 00100 } 00101 } 00102 00103 00104 void PlusVariable::bbprop() 00105 { 00106 if (input1->diaghessian.length()==0) 00107 input1->resizeDiagHessian(); 00108 if (input2->diaghessian.length()==0) 00109 input2->resizeDiagHessian(); 00110 for(int k=0; k<nelems(); k++) 00111 { 00112 input1->diaghessiandata[k] += diaghessiandata[k]; 00113 input2->diaghessiandata[k] += diaghessiandata[k]; 00114 } 00115 } 00116 00117 00118 void PlusVariable::symbolicBprop() 00119 { 00120 input1->accg(g); 00121 input2->accg(g); 00122 } 00123 00124 00125 } // end of namespace PLearn 00126 00127 00128 /* 00129 Local Variables: 00130 mode:c++ 00131 c-basic-offset:4 00132 c-file-style:"stroustrup" 00133 c-file-offsets:((innamespace . 0)(inline-open . 0)) 00134 indent-tabs-mode:nil 00135 fill-column:79 00136 End: 00137 */ 00138 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :