source: java/ecj/cecj/app/othello/OthelloTDLImprover.java @ 57

package cecj.app.othello;

import ec.EvolutionState;
import ec.Individual;
import ec.util.Parameter;
import ec.vector.DoubleVectorIndividual;
import games.BoardGame;
import games.Player;
import cecj.eval.TDLImprover;
import games.scenarios.SelfPlayTDLScenario;

public class OthelloTDLImprover implements TDLImprover {

        private static final int WPC_LENGTH = 64;

        private static final String P_REPEATS = "repeats";
        private static final String P_RANDOMNESS = "randomness";
        private static final String P_LEARNING_RATE = "learning-rate";

        private int repeats;
        private double randomness;
        private double learningRate;

        public void setup(EvolutionState state, Parameter base) {
                Parameter randomnessParam = base.push(P_RANDOMNESS);
                randomness = state.parameters.getDoubleWithDefault(randomnessParam, null, 0.1);

                Parameter learningRateParam = base.push(P_LEARNING_RATE);
                learningRate = state.parameters.getDoubleWithDefault(learningRateParam, null, 0.01);

                Parameter repeatsParam = base.push(P_REPEATS);
                repeats = state.parameters.getIntWithDefault(repeatsParam, null, 10);
        }

        public void improve(EvolutionState state, Individual ind) {
                Player player = new OthelloPlayer(getWPC(state, ind));
                BoardGame game = new OthelloGame(new OthelloBoard());
                SelfPlayTDLScenario selfPlayScenario = new SelfPlayTDLScenario(state.random[0], player,
                        randomness, learningRate);

                for (int r = 0; r < repeats; r++) {
                        game.reset();
                        selfPlayScenario.play(game);
                }
        }

        public void prepareForImproving(EvolutionState state, Individual ind) {
                double[] wpc = getWPC(state, ind);
                for (int i = 0; i < WPC_LENGTH; i++) {
                        wpc[i] = 0.0;
                }
        }

        private double[] getWPC(EvolutionState state, Individual ind) {
                if (!(ind instanceof DoubleVectorIndividual)) {
                        state.output.error("Othello players should be represented by floats vectors\n");
                }

                double[] wpc = ((DoubleVectorIndividual) ind).genome;
                if (wpc.length != WPC_LENGTH) {
                        state.output.error("Players WPC vectors length should be 64\n");
                }

                return wpc;
        }
}