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: RowSumVariable.cc,v 1.5 2004/04/27 16:02:26 morinf Exp $ 00040 * This file is part of the PLearn library. 00041 ******************************************************* */ 00042 00043 #include "RowSumVariable.h" 00044 00045 namespace PLearn { 00046 using namespace std; 00047 00048 00051 PLEARN_IMPLEMENT_OBJECT(RowSumVariable, 00052 "Result is a single column that contains the sum of each row of the input", 00053 "NO HELP"); 00054 00055 RowSumVariable::RowSumVariable(Variable* input) 00056 : inherited(input, input->length(), 1) 00057 {} 00058 00059 void RowSumVariable::recomputeSize(int& l, int& w) const 00060 { 00061 if (input) 00062 l = input->length(); 00063 else 00064 l = 0; 00065 w=1; 00066 } 00067 00068 void RowSumVariable::fprop() 00069 { 00070 value.clear(); 00071 int k=0; 00072 for(int i=0; i<input->length(); i++) 00073 for(int j=0; j<input->width(); j++, k++) 00074 valuedata[i] += input->valuedata[k]; 00075 } 00076 00077 00078 void RowSumVariable::bprop() 00079 { 00080 int k=0; 00081 for(int i=0; i<input->length(); i++) 00082 for(int j=0; j<input->width(); j++, k++) 00083 input->gradientdata[k] += gradientdata[i]; 00084 } 00085 00086 00087 void RowSumVariable::symbolicBprop() 00088 { 00089 input->accg(g); 00090 } 00091 00092 00093 00094 } // end of namespace PLearn 00095 00096