LeftPseudoInverseVariable.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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// modification, are permitted provided that the following conditions are met:
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//  1. Redistributions of source code must retain the above copyright
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/* *******************************************************      
   * $Id: LeftPseudoInverseVariable.cc,v 1.5 2004/04/27 15:58:16 morinf Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#include "LeftPseudoInverseVariable.h"
#include "Var_utils.h"

namespace PLearn {
using namespace std;


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

LeftPseudoInverseVariable::LeftPseudoInverseVariable(Variable* input)
  : inherited(input, input->length(), input->width()) 
{
    build_();
}

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

void
LeftPseudoInverseVariable::build_()
{
    if (input) {
        if (input->width() < input->length())
            PLERROR("LeftPseudoInverseVariable(Var): input width_(%d) < length_(%d)",
                    input->width(), input->length());
    }
}

void LeftPseudoInverseVariable::recomputeSize(int& l, int& w) const
{
    if (input) {
        l = input->length();
        w = input->width();
    } else
        l = w = 0;
}

void LeftPseudoInverseVariable::fprop()
{
  leftPseudoInverse(input->matValue,matValue);
}


void LeftPseudoInverseVariable::bprop()
{
  PLERROR("LeftPseudoInverseVariable: bprop not implemented yet");
}


void LeftPseudoInverseVariable::symbolicBprop()
{
  PLERROR("LeftPseudoInverseVariable: symbolicBprop not implemented yet");
}



} // end of namespace PLearn

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