ClassMarginCostFunction.h

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// -*- 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

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// modification, are permitted provided that the following conditions are met:
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//  1. Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
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//  2. Redistributions in binary form must reproduce the above copyright
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/* *******************************************************      
   * $Id: ClassMarginCostFunction.h,v 1.4 2004/04/07 23:15:58 morinf Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#ifndef ClassMarginCostFunction_INC
#define ClassMarginCostFunction_INC

#include "Kernel.h"

namespace PLearn {
using namespace std;



class ClassMarginCostFunction: public Kernel
{
  typedef Kernel inherited;

 public:
  bool binary_target_is_01;
  bool output_is_positive;
  ClassMarginCostFunction(bool the_binary_target_is_01=false, 
                          bool out_is_positive=false)
    : binary_target_is_01(the_binary_target_is_01), 
    output_is_positive(out_is_positive) {}

  PLEARN_DECLARE_OBJECT(ClassMarginCostFunction);

  virtual string info() const
    { return "class_margin"; }
  virtual real evaluate(const Vec& output, const Vec& target) const;  

protected:
  static void declareOptions(OptionList &ol);  
};

DECLARE_OBJECT_PTR(ClassMarginCostFunction);

inline CostFunc class_margin(bool binary_target_is_01=false, 
                             bool output_is_positive=false) 
{ return new ClassMarginCostFunction(binary_target_is_01,output_is_positive); }

} // end of namespace PLearn

#endif

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