IndexAtPositionVariable.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, 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:
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//  1. Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
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/* *******************************************************      
   * $Id: IndexAtPositionVariable.cc,v 1.5 2004/04/27 16:03:35 morinf Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#include "IndexAtPositionVariable.h"
#include "ColumnIndexVariable.h"

namespace PLearn {
using namespace std;


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

IndexAtPositionVariable::IndexAtPositionVariable(Variable* input1, Variable* input2, int the_length, int the_width)
  : inherited(input1, input2, the_length, the_width), length_(the_length), width_(the_width)
{
    build_();
}

void
IndexAtPositionVariable::build()
{
    inherited::build();
    build_();
}

void
IndexAtPositionVariable::build_()
{
    if (input1 && input2) {
        if(!input1->isVec() || !input2->isVec())
            PLERROR("In IndexAtPositionVariable: input1 or input2 must be a vector var");
        if(input1->size() != input2->size() || input1->size() != width_)
            PLERROR("In IndexAtPositionVariable: input1 and input2 should be of same size");
    }
}

void
IndexAtPositionVariable::declareOptions(OptionList &ol)
{
    declareOption(ol, "length_", &IndexAtPositionVariable::length_, OptionBase::buildoption, "");
    declareOption(ol, "width_", &IndexAtPositionVariable::width_, OptionBase::buildoption, "");
    inherited::declareOptions(ol);
}

void IndexAtPositionVariable::recomputeSize(int& l, int& w) const
{ l=length_; w=width_; }


void IndexAtPositionVariable::fprop()
{
  value.clear();
  for (int j=0; j<input2->size(); j++)
    {  
    int i = (int)input2->valuedata[j];
    valuedata[i*width()+j] = input1->valuedata[j];
    }
}


void IndexAtPositionVariable::bprop()
{
  for (int j=0; j<input2->size(); j++)
    {
    int i = (int)input2->valuedata[j];
    input1->gradientdata[i*width()+j] += gradientdata[j];
    }
}


void IndexAtPositionVariable::symbolicBprop()
{
  input1->accg(new ColumnIndexVariable(g,input2));
}


void IndexAtPositionVariable::rfprop()
{
/*  if (rValue.length()==0) resizeRValue();
  rValue.clear();
  if (input2->isScalar()) // input2 is a scalar (interpreted as a k)
    {
      int k = (int)input2->valuedata[0];
      rvaluedata[k] = input1->rvaluedata[0];
    }
  else // input2 has 2 Indexs (interpreted as (i,j) coordinates)
    {
      int i = (int)input2->valuedata[0];
      int j = (int)input2->valuedata[1];
      rvaluedata[i*width()+j] = input1->rvaluedata[0];
    }*/
    PLERROR("IndexAtPositionVariable::rfprop() not implemented.");
}



} // end of namespace PLearn

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