PLearn 0.1
OracleObjectGenerator.cc
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00001 // -*- C++ -*-
00002 
00003 // OracleObjectGenerator.cc
00004 //
00005 // Copyright (C) 2004 ApSTAT Technologies Inc.
00006 //
00007 // Redistribution and use in source and binary forms, with or without
00008 // modification, are permitted provided that the following conditions are met:
00009 //
00010 //  1. Redistributions of source code must retain the above copyright
00011 //     notice, this list of conditions and the following disclaimer.
00012 //
00013 //  2. Redistributions in binary form must reproduce the above copyright
00014 //     notice, this list of conditions and the following disclaimer in the
00015 //     documentation and/or other materials provided with the distribution.
00016 //
00017 //  3. The name of the authors may not be used to endorse or promote
00018 //     products derived from this software without specific prior written
00019 //     permission.
00020 //
00021 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00022 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00023 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00024 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00025 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00026 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00027 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00028 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00029 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00030 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00031 //
00032 // This file is part of the PLearn library. For more information on the PLearn
00033 // library, go to the PLearn Web site at www.plearn.org
00034 
00035 // Authors: Rejean Ducharme
00036 /* *******************************************************
00037  * $Id: OracleObjectGenerator.cc 8897 2008-04-25 18:18:23Z nouiz $
00038  ******************************************************* */
00039 
00040 #include "OracleObjectGenerator.h"
00041 
00042 namespace PLearn {
00043 using namespace std;
00044 
00045 PLEARN_IMPLEMENT_OBJECT(OracleObjectGenerator, "Generates several variants of an object from varying options returned by an OptionsOracle.",
00046                         "The OracleObjectGenerator implements the object-generation technique \n"
00047                         "using an oracle (subclass of OptionsOracle) to produce a new list of parameters. \n");
00048 
00049 
00050 OracleObjectGenerator::OracleObjectGenerator()
00051 {}
00052 
00053 void OracleObjectGenerator::build_()
00054 {
00055     if (oracle.isNull())
00056         PLERROR("An OracleObjectGenerator MUST contain an oracle (an OptionsOracle).");
00057 
00058     oracle->build();
00059     last_params.resize(0);
00060 }
00061 
00062 void OracleObjectGenerator::build()
00063 {
00064     inherited::build();
00065     build_();
00066 }
00067 
00068 void OracleObjectGenerator::forget()
00069 {
00070     inherited::forget();
00071     oracle->forget();
00072     last_params.resize(0);
00073 }
00074 
00075 void OracleObjectGenerator::declareOptions(OptionList& ol)
00076 {
00077     declareOption(ol, "oracle", &OracleObjectGenerator::oracle,
00078                   OptionBase::buildoption, "The OptionsOracle used to generate the new Object parameters. \n");
00079 
00080     declareOption(ol,"last_params", &OracleObjectGenerator::last_params,
00081                   OptionBase::learntoption,
00082                   "The last parameter returned by the oracle. \n");
00083 
00084     inherited::declareOptions(ol);
00085 }
00086 
00087 PP<Object> OracleObjectGenerator::generateNextObject()
00088 {
00089     PP<Object> next_obj;
00090 
00091     TVec<string> new_params = generation_began ? oracle->generateNextTrial(last_params, FLT_MAX) : oracle->generateFirstTrial();
00092 
00093     if (new_params.size() > 0)
00094     {
00095         CopiesMap copies;
00096         next_obj = template_object->deepCopy(copies);
00097         TVec<string> option_names = oracle->getOptionNames();
00098         for (int i=0; i<option_names.size(); i++)
00099         {
00100             next_obj->setOption(option_names[i], new_params[i]);
00101         }
00102         next_obj->build();
00103     }
00104 
00105     last_params = new_params;
00106     generation_began = true;
00107 
00108     return next_obj;
00109 }
00110 
00111 void OracleObjectGenerator::makeDeepCopyFromShallowCopy(CopiesMap& copies)
00112 {
00113     inherited::makeDeepCopyFromShallowCopy(copies);
00114     deepCopyField(last_params, copies);
00115 }
00116 
00117 } // end of namespace PLearn
00118 
00119 
00120 /*
00121   Local Variables:
00122   mode:c++
00123   c-basic-offset:4
00124   c-file-style:"stroustrup"
00125   c-file-offsets:((innamespace . 0)(inline-open . 0))
00126   indent-tabs-mode:nil
00127   fill-column:79
00128   End:
00129 */
00130 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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