MatRowVariable.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

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/* *******************************************************      
   * $Id: MatRowVariable.cc,v 1.6 2004/05/19 17:26:30 tihocan Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#include "MatRowVariable.h"

namespace PLearn {
using namespace std;


PLEARN_IMPLEMENT_OBJECT(MatRowVariable,
                        "Variable that is the row of matrix mat indexed by variable input",
                        "NO HELP");

MatRowVariable::MatRowVariable(const Mat& mat, Variable* input)
  : inherited(input, mat.width(), 1), m(mat)
{
    build_();
}

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

void
MatRowVariable::build_()
{
    if(input && !input->isScalar())
        PLERROR("IN MatRowVariable(const Mat& mat, Variable* input) input must have nelems() 1 as it is supposed to be an integer index");
}

void
MatRowVariable::declareOptions(OptionList &ol)
{
    declareOption(ol, "m", &MatRowVariable::m, OptionBase::buildoption, "");
    inherited::declareOptions(ol);
}

void
MatRowVariable::recomputeSize(int& l, int& w) const
{
    if (m.isNotEmpty())
        l=m.width();
    w = 1;
}








void MatRowVariable::makeDeepCopyFromShallowCopy(map<const void*, void*>& copies)
{
  UnaryVariable::makeDeepCopyFromShallowCopy(copies);
  deepCopyField(m, copies);
}



void MatRowVariable::fprop()
{  value << m(int(input->value[0])); }


void MatRowVariable::bprop() {}

void MatRowVariable::symbolicBprop() {}



} // end of namespace PLearn

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