SumVariable.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

// 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.
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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
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/* *******************************************************      
   * $Id: SumVariable.h,v 1.5 2004/04/27 16:02:26 morinf Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#ifndef SumVariable_INC
#define SumVariable_INC

#include "UnaryVariable.h"

namespace PLearn {
using namespace std;



class SumVariable: public UnaryVariable
{
  typedef UnaryVariable inherited;

public:
  SumVariable() {}
  SumVariable(Variable* input);

  PLEARN_DECLARE_OBJECT(SumVariable);

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

DECLARE_OBJECT_PTR(SumVariable);

inline Var sum(Var v)
{ 
  if (v->isScalar())
    return v;
  else
    return new SumVariable(v); 
}

} // end of namespace PLearn

#endif 

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