217 lines
6.9 KiB
C++
217 lines
6.9 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// eoParseTreeDepthInit.h : initializor for eoParseTree class
|
|
// (c) Maarten Keijzer 2000 Jeroen Eggermont 2002
|
|
/*
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2 of the License, or (at your option) any later version.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
Contact: todos@geneura.ugr.es, http://geneura.ugr.es
|
|
mak@dhi.dk
|
|
jeggermo@liacs.nl
|
|
|
|
*/
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#ifndef eoParseTreeDepthInit_h
|
|
#define eoParseTreeDepthInit_h
|
|
|
|
#include <EO.h>
|
|
#include <gp/eoParseTree.h>
|
|
#include <eoInit.h>
|
|
#include <eoOp.h>
|
|
#include <eoPop.h>
|
|
|
|
using namespace gp_parse_tree;
|
|
|
|
/** eoParseTreeDepthInit : the initializer class for eoParseTree
|
|
\class eoParseTreeDepthInit eoParseTreeDepthInit.h gp/eoParseTreeDepthInit.h
|
|
\ingroup ParseTree
|
|
*/
|
|
|
|
// eoGpDepthInitializer is defined for backward compatibility
|
|
#define eoGpDepthInitializer eoParseTreeDepthInit
|
|
|
|
template <class FType, class Node>
|
|
class eoParseTreeDepthInit : public eoInit< eoParseTree<FType, Node> >
|
|
{
|
|
protected:
|
|
// a binary predicate for sorting
|
|
// hopefully this will work with M$VC++ 6.0
|
|
struct lt_arity:public std::binary_function<Node,Node,bool>
|
|
{
|
|
bool operator()(const Node &_node1, const Node &_node2) { return (_node1.arity() < _node2.arity());};
|
|
};
|
|
|
|
public :
|
|
|
|
typedef eoParseTree<FType, Node> EoType;
|
|
|
|
/**
|
|
* Constructor
|
|
* @parm _max_depth The maximum depth of a tree
|
|
* @param _initializor A std::vector containing the possible nodes
|
|
* @param _grow False results in a full tree, True result is a randomly grown tree
|
|
* @param _ramped_half_and_half True results in Ramped Half and Half Initialization
|
|
*/
|
|
eoParseTreeDepthInit(
|
|
unsigned _max_depth,
|
|
const std::vector<Node>& _initializor,
|
|
bool _grow = true,
|
|
bool _ramped_half_and_half = false)
|
|
:
|
|
eoInit<EoType>(),
|
|
max_depth(_max_depth),
|
|
initializor(_initializor),
|
|
grow(_grow),
|
|
ramped_half_and_half(_ramped_half_and_half),
|
|
current_depth(_max_depth)
|
|
{
|
|
if(initializor.empty())
|
|
{
|
|
throw std::logic_error("eoParseTreeDepthInit: uhm, wouldn't you rather give a non-empty set of Nodes?");
|
|
}
|
|
// lets sort the initializor std::vector according to arity (so we can be sure the terminals are in front)
|
|
// we use stable_sort so that if element i was in front of element j and they have the same arity i remains in front of j
|
|
stable_sort(initializor.begin(), initializor.end(), lt_arity());
|
|
}
|
|
/// My class name
|
|
virtual std::string className() const { return "eoParseTreeDepthInit"; };
|
|
|
|
/**initialize a tree
|
|
* @param _tree : the tree to be initialized
|
|
*/
|
|
void operator()(EoType& _tree)
|
|
{
|
|
std::list<Node> sequence;
|
|
generate(sequence, current_depth);
|
|
|
|
parse_tree<Node> tmp(sequence.begin(), sequence.end());
|
|
_tree.swap(tmp);
|
|
|
|
if(ramped_half_and_half)
|
|
{
|
|
if(grow)
|
|
{
|
|
if (current_depth > 2)
|
|
current_depth--;
|
|
else
|
|
current_depth = max_depth;
|
|
}
|
|
// change the grow method from 'grow' to 'full' or from 'full' to 'grow'
|
|
grow = !grow;
|
|
};
|
|
|
|
}
|
|
private :
|
|
void generate(std::list<Node>& sequence, int the_max, int last_terminal = -1)
|
|
{
|
|
if (last_terminal == -1)
|
|
{ // check where the last terminal in the sequence resides
|
|
typename std::vector<Node>::iterator it;
|
|
for (it = initializor.begin(); it != initializor.end(); ++it)
|
|
{
|
|
if (it->arity() > 0)
|
|
break;
|
|
}
|
|
|
|
last_terminal = it - initializor.begin();
|
|
}
|
|
|
|
if (the_max == 1)
|
|
{ // generate terminals only
|
|
typename std::vector<Node>::iterator it = initializor.begin() + rng.random(last_terminal);
|
|
sequence.push_front(*it);
|
|
return;
|
|
}
|
|
|
|
typename std::vector<Node>::iterator what_it;
|
|
|
|
if (grow)
|
|
{
|
|
what_it = initializor.begin() + rng.random(initializor.size());
|
|
}
|
|
else // full
|
|
{
|
|
what_it = initializor.begin() + last_terminal + rng.random(initializor.size() - last_terminal);
|
|
}
|
|
|
|
what_it->randomize();
|
|
|
|
sequence.push_front(*what_it);
|
|
|
|
for (int i = 0; i < what_it->arity(); ++i)
|
|
generate(sequence, the_max - 1, last_terminal);
|
|
}
|
|
|
|
|
|
|
|
unsigned max_depth;
|
|
std::vector<Node> initializor;
|
|
bool grow;
|
|
bool ramped_half_and_half;
|
|
unsigned current_depth;
|
|
};
|
|
|
|
/**
|
|
* A template function for ramped half and half initialization of an eoParseTree population
|
|
* @param pop the population to be created
|
|
* @param population_size the size of the population to be created
|
|
* @param init_max_depth the initial maximum tree depth
|
|
* @param initializor A std::vector containing the possible nodes
|
|
|
|
\ingroup ParseTree
|
|
*/
|
|
template <class FType, class Node>
|
|
void eoInitRampedHalfAndHalf(eoPop< eoParseTree<FType,Node> > &pop, unsigned int population_size, unsigned int init_max_depth, std::vector<Node> &initializor)
|
|
{
|
|
typedef eoParseTree<FType,Node> EoType;
|
|
typedef eoPop< EoType > Pop;
|
|
|
|
unsigned int M = init_max_depth - 1;
|
|
unsigned int part_pop_size = population_size / (2*M);
|
|
unsigned int m=0;
|
|
|
|
std::cerr << "EO WARNING: Ramped Half and Half Initialization is now supported by eoParseTreeDepthInit." << std::endl;
|
|
std::cerr << " This function is now obsolete and might be removed in the future so you should"<< std::endl;
|
|
std::cerr << " update your code to use: " << std::endl << std::endl;
|
|
std::cerr << " eoParseTreeDepthInit( _max_depth, _initializer, bool _grow, bool _ramped_half_and_half)" << std::endl << std::endl;
|
|
|
|
pop.clear();
|
|
|
|
// initialize with Depth's (D) -> 2
|
|
for(m=init_max_depth; m >= 2; m--)
|
|
{
|
|
eoParseTreeDepthInit<FType, Node> grow_initializer(m, initializor, true);
|
|
Pop grow(part_pop_size, grow_initializer);
|
|
pop.insert(pop.begin(), grow.begin(), grow.end());
|
|
|
|
eoParseTreeDepthInit<FType, Node> full_initializer(m, initializor, false);
|
|
Pop full(part_pop_size, full_initializer);
|
|
pop.insert(pop.begin(), full.begin(), full.end());
|
|
}
|
|
|
|
bool g = true;
|
|
while (pop.size() < population_size)
|
|
{
|
|
eoParseTreeDepthInit<FType, Node> initializer(init_max_depth, initializor, g);
|
|
Pop p(1, initializer);
|
|
pop.insert(pop.begin(), p.begin(), p.end());
|
|
g= !g;
|
|
}
|
|
}
|
|
|
|
|
|
#endif
|