IsAboveThresholdVariable.cc

Go to the documentation of this file.

// -*- C++ -*-

// PLearn (A C++ Machine Learning Library)
// Copyright (C) 1998 Pascal Vincent
// Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio, Rejean Ducharme and University of Montreal
// Copyright (C) 2001-2002 Nicolas Chapados, Ichiro Takeuchi, Jean-Sebastien Senecal
// Copyright (C) 2002 Xiangdong Wang, Christian Dorion

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 
//  1. Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
// 
//  2. Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
// 
//  3. The name of the authors may not be used to endorse or promote
//     products derived from this software without specific prior written
//     permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
// NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// This file is part of the PLearn library. For more information on the PLearn
// library, go to the PLearn Web site at www.plearn.org


/* *******************************************************      
   * $Id: IsAboveThresholdVariable.cc,v 1.6 2004/04/27 15:59:16 morinf Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#include "IsAboveThresholdVariable.h"

namespace PLearn {
using namespace std;


PLEARN_IMPLEMENT_OBJECT(IsAboveThresholdVariable,
                        "ONE LINE DESCR",
                        "NO HELP");

IsAboveThresholdVariable::IsAboveThresholdVariable(Variable* input, real the_threshold, 
                                                   real the_truevalue, real the_falsevalue,
                                                   bool the_strict)
  : inherited(input, input->length(), input->width()),
    threshold(the_threshold), truevalue(the_truevalue), falsevalue(the_falsevalue), strict(the_strict)
{}

void
IsAboveThresholdVariable::declareOptions(OptionList &ol)
{
    declareOption(ol, "threshold", &IsAboveThresholdVariable::threshold, OptionBase::buildoption, "");
    declareOption(ol, "truevalue", &IsAboveThresholdVariable::truevalue, OptionBase::buildoption, "");
    declareOption(ol, "falsevalue", &IsAboveThresholdVariable::falsevalue, OptionBase::buildoption, "");
    declareOption(ol, "strict", &IsAboveThresholdVariable::strict, OptionBase::buildoption, "");
    inherited::declareOptions(ol);
}

void IsAboveThresholdVariable::recomputeSize(int& l, int& w) const
{
    if (input) {
        l = input->length();
        w = input->width();
    } else
        l = w = 0;
}

void IsAboveThresholdVariable::fprop()
{
  if (strict)
    for(int i=0; i<input->nelems(); i++)
      if(input->valuedata[i]>threshold)
        valuedata[i] = truevalue;
      else
        valuedata[i] = falsevalue;
  else
    for(int i=0; i<input->nelems(); i++)
      if(input->valuedata[i]>=threshold)
        valuedata[i] = truevalue;
      else
        valuedata[i] = falsevalue;
}


void IsAboveThresholdVariable::bprop() {}

void IsAboveThresholdVariable::symbolicBprop() {}


void IsAboveThresholdVariable::rfprop()
{
  if (rValue.length()==0) resizeRValue();
}



} // end of namespace PLearn

---