Class ListCrossover<T>

  • Type Parameters:
    T - The component type of the lists that are combined.
    All Implemented Interfaces:
    EvolutionaryOperator<List<T>>

    public class ListCrossover<T>
    extends AbstractCrossover<List<T>>
    Variable-point (fixed or random) cross-over for arbitrary lists.
    • Constructor Detail

      • ListCrossover

        public ListCrossover()
        Default is single-point cross-over, applied to all parents.
      • ListCrossover

        public ListCrossover​(int crossoverPoints)
        Cross-over with a fixed number of cross-over points.
        Parameters:
        crossoverPoints - The constant number of cross-over points to use for all cross-over operations.
      • ListCrossover

        public ListCrossover​(int crossoverPoints,
                             Probability crossoverProbability)
        Cross-over with a fixed number of cross-over points. Cross-over may or may not be applied to a given pair of parents depending on the crossoverProbability.
        Parameters:
        crossoverPoints - The constant number of cross-over points to use for all cross-over operations.
        crossoverProbability - The probability that, once selected, a pair of parents will be subjected to cross-over rather than being copied, unchanged, into the output population.
      • ListCrossover

        public ListCrossover​(NumberGenerator<Integer> crossoverPointsVariable)
        Cross-over with a variable number of cross-over points.
        Parameters:
        crossoverPointsVariable - A random variable that provides a number of cross-over points for each cross-over operation.
      • ListCrossover

        public ListCrossover​(NumberGenerator<Integer> crossoverPointsVariable,
                             NumberGenerator<Probability> crossoverProbabilityVariable)
        Cross-over with a variable number of cross-over points. Cross-over may or may not be applied to a given pair of parents depending on the crossoverProbability.
        Parameters:
        crossoverPointsVariable - A random variable that provides a number of cross-over points for each cross-over operation.
        crossoverProbabilityVariable - The probability that, once selected, a pair of parents will be subjected to cross-over rather than being copied, unchanged, into the output population.
    • Method Detail

      • mate

        protected List<List<T>> mate​(List<T> parent1,
                                     List<T> parent2,
                                     int numberOfCrossoverPoints,
                                     Random rng)
        Perform cross-over on a pair of parents to generate a pair of offspring.
        Specified by:
        mate in class AbstractCrossover<List<T>>
        Parameters:
        parent1 - One of two individuals that provides the source material for generating offspring.
        parent2 - One of two individuals that provides the source material for generating offspring.
        numberOfCrossoverPoints - The number of cross-overs performed on the two parents.
        rng - A source of randomness used to determine the location of cross-over points.
        Returns:
        A list containing two evolved offspring.