AffineTransformVariable.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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/* *******************************************************      
   * $Id: AffineTransformVariable.h,v 1.9 2004/04/27 15:58:16 morinf Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#ifndef AffineTransformVariable_INC
#define AffineTransformVariable_INC

#include "BinaryVariable.h"
// For inline function that can return either an AffineTransformVariable or a MatrixAffineTransformVariable
#include "MatrixAffineTransformVariable.h"

namespace PLearn {
using namespace std;


class AffineTransformVariable: public BinaryVariable
{
  typedef BinaryVariable inherited;

public:
  AffineTransformVariable() {}
  AffineTransformVariable(Variable* vec, Variable* transformation);

  PLEARN_DECLARE_OBJECT(AffineTransformVariable);

  virtual void build();

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

protected:
  void build_();
};

DECLARE_OBJECT_PTR(AffineTransformVariable);

inline Var affine_transform(Var vec, Var transformation)
{ 
 if (vec->isVec())
    return new AffineTransformVariable(vec, transformation); 
    else return new MatrixAffineTransformVariable(vec, transformation);
}

} // end of namespace PLearn

#endif 

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