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: EqualVariable.cc 4291 2005-10-21 15:15:01Z tihocan $ 00040 * This file is part of the PLearn library. 00041 ******************************************************* */ 00042 00043 #include "EqualVariable.h" 00044 #include "EqualScalarVariable.h" 00045 00046 namespace PLearn { 00047 using namespace std; 00048 00049 00050 00051 00054 PLEARN_IMPLEMENT_OBJECT(EqualVariable, 00055 "A scalar var; equal 1 if input1==input2, 0 otherwise", 00056 "NO HELP"); 00057 00058 EqualVariable::EqualVariable(Variable* input1, Variable* input2) 00059 : inherited(input1, input2, 1,1) 00060 { 00061 build_(); 00062 } 00063 00064 void 00065 EqualVariable::build() 00066 { 00067 inherited::build(); 00068 build_(); 00069 } 00070 00071 void 00072 EqualVariable::build_() 00073 { 00074 if (input1 && input2) { 00075 if (input1->length() != input2->length() || input1->width() != input2->width()) 00076 PLERROR("IN EqualVariable(Variable* input1, Variable* input2) input1 and input2 must have the same size"); 00077 } 00078 } 00079 00080 00081 void EqualVariable::recomputeSize(int& l, int& w) const 00082 { l=1; w=1; } 00083 00084 void EqualVariable::fprop() 00085 { 00086 bool equal=true; 00087 for (int i=0; i<nelems(); i++) 00088 equal = equal && 00089 fast_exact_is_equal(input1->valuedata[i],input2->valuedata[i]); 00090 valuedata[0]=equal; 00091 } 00092 00093 00094 // not really differentiable (zero gradient almost everywhere) 00095 void EqualVariable::bprop() {} 00096 00097 void EqualVariable::symbolicBprop() {} 00098 00099 Var isequal(Var v1, Var v2) 00100 { 00101 if(v2->isScalar()) 00102 return new EqualScalarVariable(v1,v2); 00103 else if(v1->isScalar()) 00104 return new EqualScalarVariable(v2,v1); 00105 else 00106 return new EqualVariable(v1,v2); 00107 } 00108 00109 00110 } // end of namespace PLearn 00111 00112 00113 /* 00114 Local Variables: 00115 mode:c++ 00116 c-basic-offset:4 00117 c-file-style:"stroustrup" 00118 c-file-offsets:((innamespace . 0)(inline-open . 0)) 00119 indent-tabs-mode:nil 00120 fill-column:79 00121 End: 00122 */ 00123 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :