PLearn 0.1
ReshapeVariable.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: ReshapeVariable.cc 3994 2005-08-25 13:35:03Z chapados $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #include "ReshapeVariable.h"
00044 
00045 namespace PLearn {
00046 using namespace std;
00047 
00048 
00051 PLEARN_IMPLEMENT_OBJECT(ReshapeVariable,
00052                         "Variable that views another variable, but with a different length() and width() "
00053                         "(the only restriction being that length()*width() remain the same)",
00054                         "NO HELP");
00055 
00056 ReshapeVariable::ReshapeVariable(Variable* v, int the_length, int the_width)
00057     : inherited(v, the_length, the_width), length_(the_length), width_(the_width)
00058 {
00059     build_();
00060 }
00061 
00062 void
00063 ReshapeVariable::build()
00064 {
00065     inherited::build();
00066     build_();
00067 }
00068 
00069 void
00070 ReshapeVariable::build_()
00071 {
00072     if (input) {
00073         if(length() * width() != input.length() * input.width())
00074             PLERROR("In ReshapeVariable: length()*width() is different from the original var's length()*width()");
00075     }
00076 }
00077 
00078 void
00079 ReshapeVariable::declareOptions(OptionList &ol)
00080 {
00081     declareOption(ol, "length_", &ReshapeVariable::length_, OptionBase::buildoption, "");
00082     declareOption(ol, "width_", &ReshapeVariable::width_, OptionBase::buildoption, "");
00083     inherited::declareOptions(ol);
00084 }
00085 
00086 void ReshapeVariable::recomputeSize(int& l, int& w) const
00087 { l=length_; w=width_; }
00088 
00089 void ReshapeVariable::fprop()
00090 {
00091     for(int k=0; k<nelems(); k++)
00092         valuedata[k] = input->valuedata[k];
00093 }
00094 
00095 
00096 void ReshapeVariable::bprop()
00097 {
00098     for(int k=0; k<nelems(); k++)
00099         input->gradientdata[k] += gradientdata[k];
00100 }
00101 
00102 
00103 void ReshapeVariable::symbolicBprop()
00104 {
00105     input->accg(new ReshapeVariable(g,input->length(),input->width()));
00106 }
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 :
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