# make_PBILupdate.h

    00001 // -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
    00002
    00003 //-----------------------------------------------------------------------------
    00004 // make_PBILupdate.h
    00005 // (c) Marc Schoenauer, Maarten Keijzer, 2001
    00006 /*
    00007     This library is free software; you can redistribute it and/or
    00008     modify it under the terms of the GNU Lesser General Public
    00009     License as published by the Free Software Foundation; either
    00010     version 2 of the License, or (at your option) any later version.
    00011
    00012     This library is distributed in the hope that it will be useful,
    00013     but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00015     Lesser General Public License for more details.
    00016
    00017     You should have received a copy of the GNU Lesser General Public
    00018     License along with this library; if not, write to the Free Software
    00019     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    00020
    00021     Contact: Marc.Schoenauer@polytechnique.fr
    00022              mkeijzer@dhi.dk
    00023  */
    00024 //-----------------------------------------------------------------------------
    00025
    00026 #ifndef _make_PBILupdate_h
    00027 #define _make_PBILupdate_h
    00028
    00029 #include <ga/eoPBILOrg.h>
    00030 #include <utils/eoRNG.h>
    00031 #include <utils/eoParser.h>
    00032 #include <utils/eoState.h>
    00033
    00034
    00036
    00047 template <class EOT>
    00048 eoDistribUpdater<EOT> &  do_make_PBILupdate(eoParser & _parser, eoState& _state, EOT)
    00049 {
    00050   // ast the moment, a single update rule is available
    00051   // but at some point we'll have to choose among different rules
    00052
    00053     std::string UType = _parser.createParam(std::string("PBIL"), "updateRule", "Type of update rule (only PBIL additive at the moment)", 'U', "Algorithm").value();
    00054
    00055   unsigned nbBest = _parser.createParam(unsigned(1), "nbBest", "Number of good guys to update from", 'B', "Algorithm").value();
    00056     double LRBest = _parser.createParam(0.1, "LRBest", "Learning Rate (from best guys)", 'L', "Algorithm").value();
    00057   unsigned nbWorst = _parser.createParam(unsigned(0), "nbWorst", "Number of bad guys to update from", 'W', "Algorithm").value();
    00058     double LRWorst = _parser.createParam(0.01, "LRWorst", "Learning Rate (from best guys)", 'L', "Algorithm").value();
    00059     double tolerance = _parser.createParam(0.0, "tolerance", "Keeping away from 0 and 1", 't', "Algorithm").value();
    00060
    00061     // a pointer to choose among several possible types
    00062   eoDistribUpdater<EOT> * ptUpdate;
    00063
    00064   if (UType == std::string("PBIL"))
    00065     {
    00066     if ( (nbWorst == 0) && (nbBest == 1) )
    00067       ptUpdate = new eoPBILOrg<EOT>(LRBest, tolerance);
    00068     else
    00069       ptUpdate = new eoPBILAdditive<EOT>(LRBest, nbBest, tolerance, LRWorst, nbWorst);
    00070     }
    00071   else
    00072     throw std::runtime_error("Only PBIL additive update rule available at the moment");
    00073
    00074   // done: don't forget to store the allocated pointers
    00075   _state.storeFunctor(ptUpdate);
    00076   return *ptUpdate;
    00077 }
    00078
    00079 #endif