PLearn 0.1
IsAboveThresholdVariable.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: IsAboveThresholdVariable.cc 3994 2005-08-25 13:35:03Z chapados $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #include "IsAboveThresholdVariable.h"
00044 
00045 namespace PLearn {
00046 using namespace std;
00047 
00048 
00051 PLEARN_IMPLEMENT_OBJECT(IsAboveThresholdVariable,
00052                         "ONE LINE DESCR",
00053                         "NO HELP");
00054 
00055 IsAboveThresholdVariable::IsAboveThresholdVariable(Variable* input, real the_threshold, 
00056                                                    real the_truevalue, real the_falsevalue,
00057                                                    bool the_strict)
00058     : inherited(input, input->length(), input->width()),
00059       threshold(the_threshold), truevalue(the_truevalue), falsevalue(the_falsevalue), strict(the_strict)
00060 {}
00061 
00062 void
00063 IsAboveThresholdVariable::declareOptions(OptionList &ol)
00064 {
00065     declareOption(ol, "threshold", &IsAboveThresholdVariable::threshold, OptionBase::buildoption, "");
00066     declareOption(ol, "truevalue", &IsAboveThresholdVariable::truevalue, OptionBase::buildoption, "");
00067     declareOption(ol, "falsevalue", &IsAboveThresholdVariable::falsevalue, OptionBase::buildoption, "");
00068     declareOption(ol, "strict", &IsAboveThresholdVariable::strict, OptionBase::buildoption, "");
00069     inherited::declareOptions(ol);
00070 }
00071 
00072 void IsAboveThresholdVariable::recomputeSize(int& l, int& w) const
00073 {
00074     if (input) {
00075         l = input->length();
00076         w = input->width();
00077     } else
00078         l = w = 0;
00079 }
00080 
00081 void IsAboveThresholdVariable::fprop()
00082 {
00083     if (strict)
00084         for(int i=0; i<input->nelems(); i++)
00085             if(input->valuedata[i]>threshold)
00086                 valuedata[i] = truevalue;
00087             else
00088                 valuedata[i] = falsevalue;
00089     else
00090         for(int i=0; i<input->nelems(); i++)
00091             if(input->valuedata[i]>=threshold)
00092                 valuedata[i] = truevalue;
00093             else
00094                 valuedata[i] = falsevalue;
00095 }
00096 
00097 
00098 void IsAboveThresholdVariable::bprop() {}
00099 
00100 void IsAboveThresholdVariable::symbolicBprop() {}
00101 
00102 
00103 void IsAboveThresholdVariable::rfprop()
00104 {
00105     if (rValue.length()==0) resizeRValue();
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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