PLearn 0.1
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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 :