UnequalConstantVariable.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
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/* *******************************************************      
   * $Id: UnequalConstantVariable.h,v 1.6 2004/07/21 16:30:54 chrish42 Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#ifndef UnequalConstantVariable_INC
#define UnequalConstantVariable_INC

#include "UnaryVariable.h"
#include <plearn/base/stringutils.h>    

namespace PLearn {
using namespace std;


class UnequalConstantVariable: public UnaryVariable
{
  typedef UnaryVariable inherited;

protected:
  real c;

public:
  UnequalConstantVariable() : c() {}
  UnequalConstantVariable(Variable* input1, real c);

  PLEARN_DECLARE_OBJECT(UnequalConstantVariable);
  static void declareOptions(OptionList &ol);

  virtual string info() const
    { return string("EqualConstantVariable (!= ")+tostring(c)+")"; }

  virtual void recomputeSize(int& l, int& w) const;
  virtual void fprop();
  virtual void bprop();
  virtual void symbolicBprop();
};

DECLARE_OBJECT_PTR(UnequalConstantVariable);

inline Var operator!=(Var v1, real cte)
{  return new UnequalConstantVariable(v1,cte); }

inline Var operator!=(real cte, Var v1)
{  return new UnequalConstantVariable(v1,cte); }


} // end of namespace PLearn

#endif 

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