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: IndexAtPositionVariable.cc 3994 2005-08-25 13:35:03Z chapados $ 00040 * This file is part of the PLearn library. 00041 ******************************************************* */ 00042 00043 #include "IndexAtPositionVariable.h" 00044 #include "ColumnIndexVariable.h" 00045 00046 namespace PLearn { 00047 using namespace std; 00048 00049 00052 PLEARN_IMPLEMENT_OBJECT(IndexAtPositionVariable, 00053 "ONE LINE DESCR", 00054 "NO HELP"); 00055 00056 00057 IndexAtPositionVariable::IndexAtPositionVariable() 00058 : length_(0), width_(0) 00059 { } 00060 00061 IndexAtPositionVariable::IndexAtPositionVariable(Variable* input1, Variable* input2, int the_length, int the_width) 00062 : inherited(input1, input2, the_length, the_width), length_(the_length), width_(the_width) 00063 { 00064 build_(); 00065 } 00066 00067 void 00068 IndexAtPositionVariable::build() 00069 { 00070 inherited::build(); 00071 build_(); 00072 } 00073 00074 void 00075 IndexAtPositionVariable::build_() 00076 { 00077 if (input1 && input2) { 00078 if(!input1->isVec() || !input2->isVec()) 00079 PLERROR("In IndexAtPositionVariable: input1 or input2 must be a vector var"); 00080 if(input1->size() != input2->size() || input1->size() != width_) 00081 PLERROR("In IndexAtPositionVariable: input1 and input2 should be of same size"); 00082 } 00083 } 00084 00085 void 00086 IndexAtPositionVariable::declareOptions(OptionList &ol) 00087 { 00088 declareOption(ol, "length_", &IndexAtPositionVariable::length_, OptionBase::buildoption, ""); 00089 declareOption(ol, "width_", &IndexAtPositionVariable::width_, OptionBase::buildoption, ""); 00090 inherited::declareOptions(ol); 00091 } 00092 00093 void IndexAtPositionVariable::recomputeSize(int& l, int& w) const 00094 { l=length_; w=width_; } 00095 00096 00097 void IndexAtPositionVariable::fprop() 00098 { 00099 value.clear(); 00100 for (int j=0; j<input2->size(); j++) 00101 { 00102 int i = (int)input2->valuedata[j]; 00103 valuedata[i*width()+j] = input1->valuedata[j]; 00104 } 00105 } 00106 00107 00108 void IndexAtPositionVariable::bprop() 00109 { 00110 for (int j=0; j<input2->size(); j++) 00111 { 00112 int i = (int)input2->valuedata[j]; 00113 input1->gradientdata[i*width()+j] += gradientdata[j]; 00114 } 00115 } 00116 00117 00118 void IndexAtPositionVariable::symbolicBprop() 00119 { 00120 input1->accg(new ColumnIndexVariable(g,input2)); 00121 } 00122 00123 00124 void IndexAtPositionVariable::rfprop() 00125 { 00126 /* if (rValue.length()==0) resizeRValue(); 00127 rValue.clear(); 00128 if (input2->isScalar()) // input2 is a scalar (interpreted as a k) 00129 { 00130 int k = (int)input2->valuedata[0]; 00131 rvaluedata[k] = input1->rvaluedata[0]; 00132 } 00133 else // input2 has 2 Indexs (interpreted as (i,j) coordinates) 00134 { 00135 int i = (int)input2->valuedata[0]; 00136 int j = (int)input2->valuedata[1]; 00137 rvaluedata[i*width()+j] = input1->rvaluedata[0]; 00138 }*/ 00139 PLERROR("IndexAtPositionVariable::rfprop() not implemented."); 00140 } 00141 00142 00143 00144 } // end of namespace PLearn 00145 00146 00147 /* 00148 Local Variables: 00149 mode:c++ 00150 c-basic-offset:4 00151 c-file-style:"stroustrup" 00152 c-file-offsets:((innamespace . 0)(inline-open . 0)) 00153 indent-tabs-mode:nil 00154 fill-column:79 00155 End: 00156 */ 00157 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :