PDistributionVariable.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: PDistributionVariable.cc,v 1.1 2004/08/17 15:37:05 larocheh Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#include "PDistributionVariable.h"
#include "Var_operators.h"
//#include "Var_utils.h"

namespace PLearn {
using namespace std;


PLEARN_IMPLEMENT_OBJECT(PDistributionVariable, "Variable that represents a random variable according to some PDistribution object",
                        "");

PDistributionVariable::PDistributionVariable(Variable* no_noise_var, PP<PDistribution> this_dist)
  : inherited(no_noise_var,no_noise_var->length(), no_noise_var->width()), dist(this_dist)
{}

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

// declareOptions //
void PDistributionVariable::declareOptions(OptionList& ol)
{
  declareOption(ol, "dist", &PDistributionVariable::dist, OptionBase::buildoption, 
                "PDistribution source of the variable.\n");

  inherited::declareOptions(ol);
}

// build //
void PDistributionVariable::build()
{
  inherited::build();
  build_();
}

void PDistributionVariable::build_()
{
  dist->train();
}

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


void PDistributionVariable::fprop() 
{
  dist->generate(value);
}

void PDistributionVariable::bprop() {} // No input: nothing to bprop

void PDistributionVariable::bbprop() {} // No input: nothing to bbprop
void PDistributionVariable::rfprop() { PLERROR("In PDistributionVariable::rfbprop() : Not implemented");} 
void PDistributionVariable::symbolicBprop() {} // No input: nothing to bprop

} // end of namespace PLearn

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