PLearn 0.1
LeftPseudoInverseVariable.cc
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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: LeftPseudoInverseVariable.cc 3994 2005-08-25 13:35:03Z chapados $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #include "LeftPseudoInverseVariable.h"
00044 #include "Var_utils.h"
00045 
00046 namespace PLearn {
00047 using namespace std;
00048 
00049 
00052 PLEARN_IMPLEMENT_OBJECT(LeftPseudoInverseVariable, 
00053                         "ONE LINE DESCR", 
00054                         "NO HELP");
00055 
00056 LeftPseudoInverseVariable::LeftPseudoInverseVariable(Variable* input)
00057     : inherited(input, input->length(), input->width()) 
00058 {
00059     build_();
00060 }
00061 
00062 void
00063 LeftPseudoInverseVariable::build()
00064 {
00065     inherited::build();
00066     build_();
00067 }
00068 
00069 void
00070 LeftPseudoInverseVariable::build_()
00071 {
00072     if (input) {
00073         if (input->width() < input->length())
00074             PLERROR("LeftPseudoInverseVariable(Var): input width_(%d) < length_(%d)",
00075                     input->width(), input->length());
00076     }
00077 }
00078 
00079 void LeftPseudoInverseVariable::recomputeSize(int& l, int& w) const
00080 {
00081     if (input) {
00082         l = input->length();
00083         w = input->width();
00084     } else
00085         l = w = 0;
00086 }
00087 
00088 void LeftPseudoInverseVariable::fprop()
00089 {
00090     leftPseudoInverse(input->matValue,matValue);
00091 }
00092 
00093 
00094 void LeftPseudoInverseVariable::bprop()
00095 {
00096     PLERROR("LeftPseudoInverseVariable: bprop not implemented yet");
00097 }
00098 
00099 
00100 void LeftPseudoInverseVariable::symbolicBprop()
00101 {
00102     PLERROR("LeftPseudoInverseVariable: symbolicBprop not implemented yet");
00103 }
00104 
00105 
00106 
00107 } // end of namespace PLearn
00108 
00109 
00110 /*
00111   Local Variables:
00112   mode:c++
00113   c-basic-offset:4
00114   c-file-style:"stroustrup"
00115   c-file-offsets:((innamespace . 0)(inline-open . 0))
00116   indent-tabs-mode:nil
00117   fill-column:79
00118   End:
00119 */
00120 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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