ReshapeVariable.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.
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//  2. Redistributions in binary form must reproduce the above copyright
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/* *******************************************************      
   * $Id: ReshapeVariable.h,v 1.5 2004/04/27 16:03:35 morinf Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#ifndef ReshapeVariable_INC
#define ReshapeVariable_INC

#include "UnaryVariable.h"

namespace PLearn {
using namespace std;



class ReshapeVariable: public UnaryVariable
{
  typedef UnaryVariable inherited;

protected:
  int length_, width_;

public:
  ReshapeVariable() {}
  ReshapeVariable(Variable* v, int the_length, int the_width);

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

  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(ReshapeVariable);

inline Var reshape(Var v, int newlength, int newwidth)
{ return new ReshapeVariable(v,newlength,newwidth); }


} // end of namespace PLearn

#endif 

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