SourceVariable.cc

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// -*- C++ -*-

// PLearn (A C++ Machine Learning Library)
// Copyright (C) 1998 Pascal Vincent
// Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio and University of Montreal

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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.
// 
//  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.
// 
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//     products derived from this software without specific prior written
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// 
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/* *******************************************************      
   * $Id: SourceVariable.cc,v 1.5 2004/04/27 16:05:33 morinf Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#include "SourceVariable.h"

namespace PLearn {
using namespace std;

PLEARN_IMPLEMENT_OBJECT(SourceVariable,
                        "ONE LINE DESCR",
                        "NO HELP");

SourceVariable::SourceVariable(int thelength, int thewidth)
  : inherited(thelength,thewidth)
{}

SourceVariable::SourceVariable(const Vec& v, bool vertical)
  : inherited(vertical ?v.toMat(v.length(),1) :v.toMat(1,v.length()))
{}

SourceVariable::SourceVariable(const Mat& m)
  : inherited(m)
{}

void SourceVariable::makeDeepCopyFromShallowCopy(map<const void*, void*>& copies)
{
  Variable::makeDeepCopyFromShallowCopy(copies);
  deepCopyField(rows_to_update, copies);
}

void SourceVariable::fprop() {} // No input: nothing to fprop
void SourceVariable::bprop() {} // No input: nothing to bprop
void SourceVariable::bbprop() {} // No input: nothing to bbprop
void SourceVariable::rfprop() {} // No input: nothing to rfprop
void SourceVariable::symbolicBprop() {} // No input: nothing to bprop

VarArray SourceVariable::sources() 
{ 
  if (!marked)
    {
      setMark();
      return Var(this);
    }
  return VarArray(0,0);
}

VarArray SourceVariable::random_sources() 
{ 
  if (!marked)
    setMark();
  return VarArray(0,0);
}

VarArray SourceVariable::ancestors() 
{ 
  if (marked)
    return VarArray(0,0);
  setMark();
  return Var(this);
}

void SourceVariable::unmarkAncestors()
{ 
  if (marked)
    clearMark();
}

VarArray SourceVariable::parents()
{ return VarArray(0,0); }

bool SourceVariable::markPath()
{ return marked; }

void SourceVariable::buildPath(VarArray& proppath)
{
  if(marked)
    {
      //cout<<"add:"<<this->getName()<<endl;
      proppath.append(Var(this));
      clearMark();
    }
}

} // end of namespace PLearn

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