Population pop = initPopulation(rnd, eval);
ScoreFunction score = new ScoreSmallExpression(training,30);
EvolutionaryAlgorithm genetic = new BasicEA(pop, score);
genetic.addOperation(0.3, new MutateTree(3));
genetic.addOperation(0.7, new CrossoverTree());
genetic.setShouldIgnoreExceptions(false);
int sameSolutionCount = 0;
int iteration = 1;