PLearn 0.1
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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: PlusConstantVariable.cc 8956 2008-05-08 19:19:03Z tihocan $ 00040 * This file is part of the PLearn library. 00041 ******************************************************* */ 00042 00043 #include "PlusConstantVariable.h" 00044 00045 namespace PLearn { 00046 using namespace std; 00047 00048 00051 PLEARN_IMPLEMENT_OBJECT( 00052 PlusConstantVariable, 00053 "Adds a scalar constant to a matrix Variable.", 00054 "" 00055 ); 00056 00058 // PlusConstantVariable // 00060 PlusConstantVariable::PlusConstantVariable(): 00061 cst(0) 00062 {} 00063 00064 PlusConstantVariable::PlusConstantVariable(Variable* input, real c, 00065 bool call_build_): 00066 inherited(input, input->length(), input->width(), call_build_), 00067 cst(c) 00068 { 00069 if (call_build_) 00070 build_(); 00071 } 00072 00074 // build // 00076 void PlusConstantVariable::build() { 00077 inherited::build(); 00078 build_(); 00079 } 00080 00082 // build_ // 00084 void PlusConstantVariable::build_() { 00085 // Nothing to do here. 00086 } 00087 00089 // declareOptions // 00091 void PlusConstantVariable::declareOptions(OptionList &ol) 00092 { 00093 inherited::declareOptions(ol); 00094 declareOption(ol, "cst", &PlusConstantVariable::cst, 00095 OptionBase::buildoption, 00096 "The constant to be added."); 00097 } 00098 00099 void PlusConstantVariable::recomputeSize(int& l, int& w) const 00100 { 00101 if (input) { 00102 l = input->length(); 00103 w = input->width(); 00104 } else 00105 l = w = 0; 00106 } 00107 00108 void PlusConstantVariable::fprop() 00109 { 00110 for(int k=0; k<nelems(); k++) 00111 valuedata[k] = input->valuedata[k] + cst; 00112 } 00113 00114 00115 void PlusConstantVariable::bprop() 00116 { 00117 for(int k=0; k<nelems(); k++) 00118 input->gradientdata[k] += gradientdata[k]; 00119 } 00120 00121 00122 void PlusConstantVariable::symbolicBprop() 00123 { 00124 input->accg(g); 00125 } 00126 00127 00128 // R(x+c) = R(x) 00129 void PlusConstantVariable::rfprop() 00130 { 00131 if (rValue.length()==0) resizeRValue(); 00132 for(int k=0; k<nelems(); k++) 00133 rvaluedata[k] = input->rvaluedata[k]; 00134 } 00135 00136 00137 00138 } // end of namespace PLearn 00139 00140 00141 /* 00142 Local Variables: 00143 mode:c++ 00144 c-basic-offset:4 00145 c-file-style:"stroustrup" 00146 c-file-offsets:((innamespace . 0)(inline-open . 0)) 00147 indent-tabs-mode:nil 00148 fill-column:79 00149 End: 00150 */ 00151 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :