Initial version of the tutorial.
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eo/tutorial/Lesson3/SecondBitEA.cpp
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375
eo/tutorial/Lesson3/SecondBitEA.cpp
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//-----------------------------------------------------------------------------
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// SecondGA.cpp
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//-----------------------------------------------------------------------------
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//*
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// Same code than FirstBitEA as far as Evolutionary Computation is concerned
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// but now you learn to enter the parameters in a more flexible way
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// and to twidle the output to your preferences!
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//-----------------------------------------------------------------------------
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// standard includes
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#include <stdexcept> // runtime_error
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#include <iostream> // cout
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#include <strstream> // ostrstream, istrstream
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#include <fstream>
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// the general include for eo
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#include <eo>
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// EVAL
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#include "binary_value.h"
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// REPRESENTATION
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//-----------------------------------------------------------------------------
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// define your genotype and fitness types
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typedef eoBin<double> Indi;
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// PARAMETRES
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//-----------------------------------------------------------------------------
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// instead of having all values of useful parameters as constants, read them:
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// either on the command line (--option=value or -o=value)
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// or in a parameter file (same syntax, order independent,
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// # = usual comment character
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// or in the environment (TODO)
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// note that the parameters are passed by reference so they can be updated
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void read_param(int argc, char *argv[],
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uint32 & _seed,
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unsigned int & _vecSize,
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unsigned int & _popSize,
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unsigned int & _tSize,
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double & _pCross,
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double & _pMut,
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string & _load_name,
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unsigned int & _maxGen,
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unsigned int & _minGen,
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unsigned int & _steadyGen,
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double & _onePointRate,
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double & _twoPointsRate,
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double & _uRate,
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double & _pMutPerBit,
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double & _bitFlipRate,
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double & _oneBitRate
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)
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{
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// define a parser from the command-line arguments
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eoParser parser(argc, argv);
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// For each parameter, define Parameters directly in the parser,
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// and assign the value to the variable
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eoValueParam<uint32>& seedParam = parser.createParam<uint32>(time(0), "seed", "Random number seed", 'S');
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_seed = seedParam.value();
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eoValueParam<unsigned int>& vecSizeParam = parser.createParam<unsigned int>(8, "vecSize", "Genotype size",'V', "Representation");
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_vecSize = vecSizeParam.value();
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eoValueParam<unsigned int>& popSizeParam = parser.createParam<unsigned int>(10, "popSize", "Population size",'P', "Evolution");
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_popSize = popSizeParam.value();
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eoValueParam<unsigned int>& tSizeParam = parser.createParam<unsigned int>(10, "tSize", "Tournament size",'T', "Evolution");
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_tSize = tSizeParam.value();
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eoValueParam<string>& load_nameParam = parser.createParam<string>("", "Load","A save file to restart from",'L', "Persistence");
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_load_name = load_nameParam.value();
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eoValueParam<unsigned int>& maxGenParam = parser.createParam<unsigned int>(100, "maxGen", "Maximum number of generations",'G', "Stopping criterion");
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_maxGen = maxGenParam.value();
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eoValueParam<unsigned int>& minGenParam = parser.createParam<unsigned int>(100, "minGen", "Minimum number of generations",'g', "Stopping criterion");
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_minGen = minGenParam.value();
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eoValueParam<unsigned int>& steadyGenParam = parser.createParam<unsigned int>(100, "steadyGen", "Number of generations with no improvement",'s', "Stopping criterion");
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_steadyGen = steadyGenParam.value();
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eoValueParam<double>& pCrossParam = parser.createParam<double>(0.6, "pCross", "Probability of Crossover", 'C', "Genetic Operators");
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_pCross = pCrossParam.value();
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eoValueParam<double>& pMutParam = parser.createParam<double>(0.1, "pMut", "Probability of Mutation", 'M', "Genetic Operators");
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_pMut = pMutParam.value();
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eoValueParam<double>& onePointRateParam = parser.createParam<double>(1, "onePointRate", "Relative rate for one point crossover", '1', "Genetic Operators");
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_onePointRate = onePointRateParam.value();
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eoValueParam<double>& twoPointsRateParam = parser.createParam<double>(1, "twoPointRate", "Relative rate for two point crossover", '2', "Genetic Operators");
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_twoPointsRate = twoPointsRateParam.value();
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eoValueParam<double>& uRateParam = parser.createParam<double>(2, "uRate", "Relative rate for uniform crossover", 'U', "Genetic Operators");
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_uRate = uRateParam.value();
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eoValueParam<double>& pMutPerBitParam = parser.createParam<double>(0.01, "pMutPerBit", "Probability of flipping 1 bit in bit-flip mutation", 'b', "Genetic Operators");
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_pMutPerBit = pMutPerBitParam.value();
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eoValueParam<double>& bitFlipRateParam = parser.createParam<double>(0.01, "bitFlipRate", "Relative rate for bit-flip mutation", 'B', "Genetic Operators");
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_bitFlipRate = bitFlipRateParam.value();
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eoValueParam<double>& oneBitRateParam = parser.createParam<double>(0.01, "oneBitRate", "Relative rate for deterministic bit-flip mutation", 'D', "Genetic Operators");
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_oneBitRate = oneBitRateParam.value();
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// the name of the "status" file where all actual parameter values will be saved
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string str_status = parser.ProgramName() + ".status";
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eoValueParam<string>& status_nameParam = parser.createParam<string>(str_status.c_str(), "status","Status file",'S', "Persistence");
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// do the following AFTER ALL PARAMETERS HAVE BEEN PROCESSED
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// i.e. in case you need parameters somewhere else, postpone these
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if (parser.userNeedsHelp())
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{
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parser.printHelp(cout);
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exit(1);
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}
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if (status_nameParam.value() != "")
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{
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ofstream os(status_nameParam.value().c_str());
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os << parser; // and you can use that file as parameter file
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}
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}
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// GENERAL
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// now the main_function: nothing changed, except input/output
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void main_function(int argc, char **argv)
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{
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// PARAMETRES
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uint32 seed;
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// decription of genotype
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unsigned int vecSize;
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// parameters for evolution engine
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unsigned int popSize;
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unsigned int tSize;
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// operators probabilities at the algorithm level
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double pCross;
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double pMut;
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// init and stop
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string load_name;
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unsigned int maxGen;
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unsigned int minGen;
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unsigned int steadyGen;
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// rates for crossovers
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double onePointRate;
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double twoPointsRate;
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double URate;
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// rates and private parameters for mutations;
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double pMutPerBit;
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double bitFlipRate;
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double oneBitRate;
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// Now read the parameters of the program
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read_param(argc, argv, seed, vecSize, popSize, tSize,
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pCross, pMut, load_name, maxGen, minGen, steadyGen,
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onePointRate, twoPointsRate, URate,
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pMutPerBit, bitFlipRate, oneBitRate );
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// EVAL
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/////////////////////////////
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// Fitness function
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////////////////////////////
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// Evaluation: from a plain C++ fn to an EvalFunc Object ...
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eoEvalFuncPtr<Indi, double, const vector<bool>& > plainEval( binary_value );
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// ... to an object that counts the nb of actual evaluations
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eoEvalFuncCounter<Indi> eval(plainEval);
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// INIT
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////////////////////////////////
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// Initilisation of population
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////////////////////////////////
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// Either load or initialize
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// create an empty pop
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eoPop<Indi> pop;
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// create a state for reading
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eoState inState; // a state for loading - WITHOUT the parser
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// register the rng and the pop in the state, so they can be loaded,
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// and the present run will be the exact conitnuation of the saved run
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// eventually with different parameters
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inState.registerObject(rng);
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inState.registerObject(pop);
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if (load_name != "")
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{
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inState.load(load_name); // load the pop and the rng
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// the fitness is read in the file:
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// do only evaluate the pop if the fitness has changed
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}
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else
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{
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rng.reseed(seed);
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// a Indi random initializer
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// based on boolean_generator class (see utils/rnd_generator.h)
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eoInitFixedLength<Indi, boolean_generator>
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random(vecSize, boolean_generator());
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// Init pop from the randomizer: need to use the append function
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pop.append(popSize, random);
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// and evaluate pop (STL syntax)
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apply<Indi>(eval, pop);
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} // end of initializatio of the population
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// OUTPUT
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// sort pop for pretty printout
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pop.sort();
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// Print (sorted) intial population (raw printout)
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cout << "Initial Population" << endl << pop << endl;
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// ENGINE
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/////////////////////////////////////
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// selection and replacement
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////////////////////////////////////
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// SELECT
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// The robust tournament selection
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eoDetTournament<Indi> selectOne(tSize); // tSize in [2,POPSIZE]
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// is now encapsulated in a eoSelectPerc (entage)
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eoSelectPerc<Indi> select(selectOne);// by default rate==1
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// REPLACE
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// And we now have the full slection/replacement - though with
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// no replacement (== generational replacement) at the moment :-)
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eoNoReplacement<Indi> replace;
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// OPERATORS
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//////////////////////////////////////
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// The variation operators
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//////////////////////////////////////
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// CROSSOVER
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// 1-point crossover for bitstring
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eoBinCrossover<Indi> xover1;
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// uniform crossover for bitstring
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eoBinUxOver<Indi> xoverU;
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// 2-pots xover
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eoBinNxOver<Indi> xover2(2);
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// Combine them with relative rates
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eoPropCombinedQuadOp<Indi> xover(xover1, onePointRate);
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xover.add(xoverU, URate);
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xover.add(xover2, twoPointsRate, true);
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// MUTATION
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// standard bit-flip mutation for bitstring
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eoBinMutation<Indi> mutationBitFlip(pMutPerBit);
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// mutate exactly 1 bit per individual
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eoDetBitFlip<Indi> mutationOneBit;
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// Combine them with relative rates
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eoPropCombinedMonOp<Indi> mutation(mutationBitFlip, bitFlipRate);
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mutation.add(mutationOneBit, oneBitRate, true);
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// The operators are encapsulated into an eoTRansform object
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eoSGATransform<Indi> transform(xover, pCross, mutation, pMut);
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// STOP
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//////////////////////////////////////
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// termination condition see FirstBitEA.cpp
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/////////////////////////////////////
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eoGenContinue<Indi> genCont(maxGen);
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eoSteadyFitContinue<Indi> steadyCont(minGen, steadyGen);
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eoFitContinue<Indi> fitCont(vecSize);
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eoCombinedContinue<Indi> continuator(genCont);
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continuator.add(steadyCont);
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continuator.add(fitCont);
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// CHECKPOINT
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// but now you want to make many different things every generation
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// (e.g. statistics, plots, ...).
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// the class eoCheckPoint is dedicated to just that:
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// Declare a checkpoint (from a continuator: an eoCheckPoint
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// IS AN eoContinue and will be called in the loop of all algorithms)
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eoCheckPoint<Indi> checkpoint(continuator);
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// Create a counter parameter
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eoValueParam<unsigned> generationCounter(0, "Gen.");
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// Create an incrementor (sub-class of eoUpdater). Note that the
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// parameter's value is passed by reference,
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// so every time the incrementer is updated (every generation),
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// the data in generationCounter will change.
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eoIncrementor<unsigned> increment(generationCounter.value());
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// Add it to the checkpoint,
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// so the counter is updated (here, incremented) every generation
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checkpoint.add(increment);
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// now some statistics on the population:
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// Best fitness in population
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eoBestFitnessStat<Indi> bestStat;
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// Second moment stats: average and stdev
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eoSecondMomentStats<Indi> SecondStat;
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// Add them to the checkpoint to get them called at the appropriate time
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checkpoint.add(bestStat);
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checkpoint.add(SecondStat);
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// The Stdout monitor will print parameters to the screen ...
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eoStdoutMonitor monitor(false);
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// when called by the checkpoint (i.e. at every generation)
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checkpoint.add(monitor);
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// the monitor will output a series of parameters: add them
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monitor.add(generationCounter);
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monitor.add(eval); // because now eval is an eoEvalFuncCounter!
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monitor.add(bestStat);
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monitor.add(SecondStat);
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// A file monitor: will print parameters to ... a File, yes, you got it!
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eoFileMonitor fileMonitor("stats.xg", " ");
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// the checkpoint mechanism can handle multiple monitors
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checkpoint.add(fileMonitor);
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// the fileMonitor can monitor parameters, too, but you must tell it!
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fileMonitor.add(generationCounter);
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fileMonitor.add(bestStat);
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fileMonitor.add(SecondStat);
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// Last type of item the eoCheckpoint can handle: state savers:
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eoState outState;
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// Register the algorithm into the state (so it has something to save!!)
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outState.registerObject(rng);
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outState.registerObject(pop);
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// and feed the state to state savers
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// save state every 100th generation
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eoCountedStateSaver stateSaver1(100, outState, "generation");
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// save state every 1 seconds
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eoTimedStateSaver stateSaver2(1, outState, "time");
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// Don't forget to add the two savers to the checkpoint
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checkpoint.add(stateSaver1);
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checkpoint.add(stateSaver2);
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// and that's it for the (control and) output
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// GENERATION
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/////////////////////////////////////////
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// the algorithm
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////////////////////////////////////////
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// Easy EA requires
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// selection, transformation, eval, replacement, and stopping criterion
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eoEasyEA<Indi> gga(checkpoint, eval, select, transform, replace);
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// Apply algo to pop - that's it!
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gga(pop);
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// OUTPUT
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// Print (sorted) intial population
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pop.sort();
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cout << "FINAL Population\n" << pop << endl;
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// GENERAL
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}
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// A main that catches the exceptions
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int main(int argc, char **argv)
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{
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#ifdef _MSC_VER
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int flag = _CrtSetDbgFlag(_CRTDBG_LEAK_CHECK_DF);
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flag |= _CRTDBG_LEAK_CHECK_DF;
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_CrtSetDbgFlag(flag);
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// _CrtSetBreakAlloc(100);
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#endif
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try
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{
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main_function(argc, argv);
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}
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catch(exception& e)
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{
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cout << "Exception: " << e.what() << '\n';
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}
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return 1;
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}
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