64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
/*
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* Copyright (C) 2005 Maarten Keijzer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef EOSYMINIT_H
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#define EOSYMINIT_H
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#include <eoInit.h>
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#include <gen/TreeBuilder.h>
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/** Default initializer, Koza style */
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template <class EoType>
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class eoSymInit : public eoInit<EoType> {
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TreeBuilder& builder;
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double own_grow_prob;
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unsigned own_max_depth;
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double& grow_prob;
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unsigned& max_depth;
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public:
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/** By default build ramped half and half with max depth 6 */
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eoSymInit(TreeBuilder& _builder)
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: builder(_builder),
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own_grow_prob(0.5),
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own_max_depth(6),
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grow_prob(own_grow_prob),
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max_depth(own_max_depth)
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{}
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/** Control the grow_prob and max_depth externally */
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eoSymInit(TreeBuilder& _builder, double& _grow_prob, unsigned& _max_depth)
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: builder(_builder),
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grow_prob(_grow_prob),
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max_depth(_max_depth)
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{}
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/** build the tree */
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void operator()(EoType& tree) {
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int depth_to_use = rng.random(max_depth-2) + 2; // two levels minimum
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builder.build_tree(tree, depth_to_use, rng.flip(grow_prob));
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}
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};
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#endif
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