PLearn 0.1
PDistributionVariable.cc
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00001 // -*- C++ -*-
00002 
00003 // PLearn (A C++ Machine Learning Library)
00004 // Copyright (C) 1998 Pascal Vincent
00005 // Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio, Rejean Ducharme and University of Montreal
00006 // Copyright (C) 2001-2002 Nicolas Chapados, Ichiro Takeuchi, Jean-Sebastien Senecal
00007 // Copyright (C) 2002 Xiangdong Wang, Christian Dorion
00008 
00009 // Redistribution and use in source and binary forms, with or without
00010 // modification, are permitted provided that the following conditions are met:
00011 // 
00012 //  1. Redistributions of source code must retain the above copyright
00013 //     notice, this list of conditions and the following disclaimer.
00014 // 
00015 //  2. Redistributions in binary form must reproduce the above copyright
00016 //     notice, this list of conditions and the following disclaimer in the
00017 //     documentation and/or other materials provided with the distribution.
00018 // 
00019 //  3. The name of the authors may not be used to endorse or promote
00020 //     products derived from this software without specific prior written
00021 //     permission.
00022 // 
00023 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00024 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00025 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00026 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00027 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00028 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00029 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00030 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00031 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00032 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00033 // 
00034 // This file is part of the PLearn library. For more information on the PLearn
00035 // library, go to the PLearn Web site at www.plearn.org
00036 
00037 
00038 /* *******************************************************      
00039  * $Id: PDistributionVariable.cc 6861 2007-04-09 19:04:15Z saintmlx $
00040  * This file is part of the PLearn library.
00041  ******************************************************* */
00042 
00043 #include "PDistributionVariable.h"
00044 #include "Var_operators.h"
00045 //#include "Var_utils.h"
00046 
00047 namespace PLearn {
00048 using namespace std;
00049 
00050 
00053 PLEARN_IMPLEMENT_OBJECT(PDistributionVariable, "Variable that represents a random variable according to some PDistribution object",
00054                         "");
00055 
00056 PDistributionVariable::PDistributionVariable(Variable* no_noise_var, PP<PDistribution> this_dist)
00057     : inherited(no_noise_var,no_noise_var->length(), no_noise_var->width()), dist(this_dist)
00058 {}
00059 
00060 void PDistributionVariable::recomputeSize(int& l, int& w) const
00061 {
00062     if (input) {
00063         l = input->length();
00064         w = input->width();
00065     } else
00066         l = w = 0;
00067 }
00068 
00070 // declareOptions //
00072 void PDistributionVariable::declareOptions(OptionList& ol)
00073 {
00074     declareOption(ol, "dist", &PDistributionVariable::dist, OptionBase::buildoption, 
00075                   "PDistribution source of the variable.\n");
00076 
00077     inherited::declareOptions(ol);
00078 }
00079 
00081 // build //
00083 void PDistributionVariable::build()
00084 {
00085     inherited::build();
00086     build_();
00087 }
00088 
00089 void PDistributionVariable::build_()
00090 {
00091     dist->train();
00092 }
00093 
00094 void PDistributionVariable::makeDeepCopyFromShallowCopy(CopiesMap& copies)
00095 {
00096     inherited::makeDeepCopyFromShallowCopy(copies);
00097     deepCopyField(dist, copies);
00098 }
00099 
00100 
00101 void PDistributionVariable::fprop() 
00102 {
00103     dist->generate(value);
00104 }
00105 
00106 void PDistributionVariable::bprop() {} // No input: nothing to bprop
00107 
00108 void PDistributionVariable::bbprop() {} // No input: nothing to bbprop
00109 void PDistributionVariable::rfprop() { PLERROR("In PDistributionVariable::rfbprop() : Not implemented");} 
00110 void PDistributionVariable::symbolicBprop() {} // No input: nothing to bprop
00111 
00112 } // end of namespace PLearn
00113 
00114 
00115 /*
00116   Local Variables:
00117   mode:c++
00118   c-basic-offset:4
00119   c-file-style:"stroustrup"
00120   c-file-offsets:((innamespace . 0)(inline-open . 0))
00121   indent-tabs-mode:nil
00122   fill-column:79
00123   End:
00124 */
00125 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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