PLearn 0.1
ConcatRowsVariable.cc
Go to the documentation of this file.
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: ConcatRowsVariable.cc 4493 2005-11-13 03:48:04Z morinf $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #include "ConcatRowsVariable.h"
00044 #include "SubMatVariable.h"
00045 
00046 namespace PLearn {
00047 using namespace std;
00048 
00049 
00050 
00053 PLEARN_IMPLEMENT_OBJECT(ConcatRowsVariable,
00054                         "Concatenation of the rows of several variables",
00055                         "");
00056 
00057 ConcatRowsVariable::ConcatRowsVariable(const VarArray& vararray)
00058     : inherited(vararray.nonNull(), vararray.sumOfLengths(), vararray.maxWidth())
00059 {
00060     build_();
00061 }
00062 
00063 void
00064 ConcatRowsVariable::build()
00065 {
00066     inherited::build();
00067     build_();
00068 }
00069 
00070 void
00071 ConcatRowsVariable::build_()
00072 {
00073     // all the variables must have the same width
00074     if (varray->length()) {
00075         int w = varray[0]->width();
00076         for (int i = 1; i < varray.size(); i++)
00077             if (w != varray[i]->width())
00078                 PLERROR("ConcatRowsVariable: all non-null variables must have the same width (%d != %d)", w, varray[i]->width());
00079     }
00080 }
00081 
00082 
00083 void ConcatRowsVariable::recomputeSize(int& l, int& w) const
00084 {
00085     if (varray) {
00086         l = varray.sumOfLengths();
00087         w = varray.maxWidth(); // Note: actually, all vars have same width.
00088     } else
00089         l = w = 0;
00090 }
00091 
00092 
00093 void ConcatRowsVariable::fprop()
00094 {
00095     int k=0;
00096     for (int n=0; n<varray.size(); n++) {
00097         Var vn = varray[n];
00098         for (int i=0; i<vn->nelems(); i++, k++)
00099             valuedata[k] = vn->valuedata[i];
00100     }
00101 }
00102 
00103 
00104 void ConcatRowsVariable::bprop()
00105 {
00106     int k=0;
00107     for (int n=0; n<varray.size(); n++) {
00108         Var vn = varray[n];
00109         for (int i=0; i<vn->nelems(); i++, k++)
00110             vn->gradientdata[i] += gradientdata[k];
00111     }
00112 }
00113 
00114 
00115 void ConcatRowsVariable::symbolicBprop()
00116 {
00117     int k=0;
00118     for (int n=0; n<varray.size(); n++) {
00119         Var vn = varray[n];
00120         vn->accg(new SubMatVariable(g, k, 0, vn->length(), width()));
00121         k += vn->length();
00122     }
00123 }
00124 
00125 
00126 void ConcatRowsVariable::rfprop()
00127 {
00128     if (rValue.length()==0) resizeRValue();
00129     int k=0;
00130     for (int n=0; n<varray.size(); n++) {
00131         Var vn = varray[n];
00132         for (int i=0; i<vn->nelems(); i++, k++)
00133             rvaluedata[k] = vn->rvaluedata[i];
00134     }
00135 }
00136 
00137 } // end of namespace PLearn
00138 
00139 
00140 /*
00141   Local Variables:
00142   mode:c++
00143   c-basic-offset:4
00144   c-file-style:"stroustrup"
00145   c-file-offsets:((innamespace . 0)(inline-open . 0))
00146   indent-tabs-mode:nil
00147   fill-column:79
00148   End:
00149 */
00150 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Defines