ClassErrorCostFunction.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:
// 
//  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: ClassErrorCostFunction.h,v 1.4 2004/04/07 23:15:17 morinf Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#ifndef ClassErrorCostFunction_INC
#define ClassErrorCostFunction_INC

#include "Kernel.h"

namespace PLearn {
using namespace std;




class ClassErrorCostFunction: public Kernel
{
  typedef Kernel inherited;

  protected:
    bool output_is_classnum;

 public:
  ClassErrorCostFunction(bool the_output_is_classnum = false)
    :output_is_classnum(the_output_is_classnum) {}

  PLEARN_DECLARE_OBJECT(ClassErrorCostFunction);

  virtual string info() const
    { return "class_error"; }

  virtual real evaluate(const Vec& output, const Vec& target) const;

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

DECLARE_OBJECT_PTR(ClassErrorCostFunction);

inline CostFunc class_error(bool output_is_classnum=false) 
{ 
  return new ClassErrorCostFunction(output_is_classnum); 
} 


} // end of namespace PLearn

#endif

---