AbstractOffspringParent.java

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package hh.creditassignment.offspringparent;

import hh.creditassigment.AbstractRewardDefintion;
import hh.creditassigment.CreditFunctionInputType;
import hh.creditassigment.CreditFitnessFunctionType;
import org.moeaframework.core.Population;
import org.moeaframework.core.Solution;

/**
 * Class defining the inputType for reward definition based on comparing the offspring solution to the parent solution
 * @author nozomihitomi
 */
public abstract class AbstractOffspringParent extends AbstractRewardDefintion{

    public AbstractOffspringParent(){
        inputType = CreditFunctionInputType.OP;
        fitType = CreditFitnessFunctionType.Do;
    }
    
    
    /**
     * Computes the reward of an offspring solution with respect to multiple 
     * parents. Can be used if a heuristic produces one offspring solution. 
     * Finds the parent that is non-dominated to compare offspring solution. If 
     * there are multiple non-dominated parents, a random non-dominated parent
     * is selected.
     * @param offspring offspring solutions that will receive credits
     * @param parent the parent solution to compare the offspring solutions with
     * @param pop population may be needed to calculate the fitness of the offspring and parent solutions
     * @param removedSolution the solution that was just removed from the population
     * @return the value of reward to resulting from the solution
     */
    public abstract double compute(Solution offspring, Solution parent,Population pop, Solution removedSolution);
    
}