PLearn 0.1
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00001 // -*- C++ -*- 00002 00003 // TraceVariable.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 "TraceVariable.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 TraceVariable, 00051 "Computes the trace of the input variable (i.e. the sum of its diagonal).", 00052 "Resulting variable is a scalar (1x1 matrix)" 00053 ); 00054 00056 // TraceVariable // 00058 00059 TraceVariable::TraceVariable() 00060 {} 00061 00062 TraceVariable::TraceVariable(Variable* input, bool call_build_): 00063 inherited(input, 1, 1, call_build_) 00064 { 00065 if (call_build_) 00066 build_(); 00067 } 00068 00070 // build // 00072 void TraceVariable::build() { 00073 inherited::build(); 00074 build_(); 00075 } 00076 00078 // build_ // 00080 void TraceVariable::build_() { 00081 // Nothing to do here. 00082 } 00083 00085 // recomputeSize // 00087 void TraceVariable::recomputeSize(int& l, int& w) const 00088 { 00089 l = w = 1; 00090 } 00091 00092 00093 void TraceVariable::fprop() 00094 { 00095 Mat V = input->matValue; 00096 int l = min(V.length(), V.width()); 00097 double result = 0; 00098 for(int i=0; i<l; i++) 00099 result += V(i,i); 00100 matValue(0,0) = result; 00101 } 00102 00103 void TraceVariable::bprop() 00104 { 00105 double g = matGradient(0,0); 00106 Mat G = input->gradientValue; 00107 int l = min(G.length(), G.width()); 00108 for(int i=0; i<l; i++) 00109 G(i,i) += g; 00110 } 00111 00112 00113 void TraceVariable::bbprop() 00114 { 00115 PLERROR("bbprop not implemented for this variable"); 00116 } 00117 00118 00119 void TraceVariable::symbolicBprop() 00120 { 00121 PLERROR("symbolic bprop not yet implemented for this variable"); 00122 } 00123 00124 00125 void TraceVariable::rfprop() 00126 { 00127 PLERROR("rfprop no yet implemented for this vairable"); 00128 } 00129 00130 00131 00132 } // end of namespace PLearn 00133 00134 00135 /* 00136 Local Variables: 00137 mode:c++ 00138 c-basic-offset:4 00139 c-file-style:"stroustrup" 00140 c-file-offsets:((innamespace . 0)(inline-open . 0)) 00141 indent-tabs-mode:nil 00142 fill-column:79 00143 End: 00144 */ 00145 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :