ThresholdVMatrix.cc

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// -*- C++ -*-

// PLearn (A C++ Machine Learning Library)
// Copyright (C) 1998 Pascal Vincent
// Copyright (C) 1999-2001 Pascal Vincent, Yoshua Bengio, Rejean Ducharme and University of Montreal
// Copyright (C) 2002 Pascal Vincent, Julien Keable, Xavier Saint-Mleux
//
// 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.
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//     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
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// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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// 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


#include "ThresholdVMatrix.h"

namespace PLearn {
using namespace std;


ThresholdVMatrix::ThresholdVMatrix()
    : threshold(1), cold_value(0), hot_value(1), gt_threshold(true)
{
}

ThresholdVMatrix::ThresholdVMatrix(VMat the_underlying_distr, real threshold_, real the_cold_value, real the_hot_value,
                                   bool gt_threshold_)
  : inherited(the_underlying_distr->length(), the_underlying_distr->width()),
    underlying_distr(the_underlying_distr), threshold(threshold_), cold_value(the_cold_value),
    hot_value(the_hot_value), gt_threshold(gt_threshold_)
{}

void ThresholdVMatrix::getNewRow(int i, const Vec& v) const
{
#ifdef BOUNDCHECK
  if(i<0 || i>=length())
    PLERROR("In ThresholdVMatrix::getNewRow OUT OF BOUNDS");
  if(v.length()!=width())
    PLERROR("In ThresholdVMatrix::getNewRow v.length() must be equal to the VMat's width");
#endif
  underlying_distr->getRow(i,v);
  int p= v.size()-1;
  if(gt_threshold && v[p] <= threshold || !gt_threshold && v[p] < threshold)
    v[p]= cold_value;
  else
    v[p]= hot_value;
}

} // end of namespcae PLearn

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