Ejemplo n.º 1
0
  /**
   * Compare the {@linkplain Entity} objects returning the desired ordering.
   *
   * @param e1 The first {@linkplain Entity} to be used in the comparison.
   * @param e2 The second {@linkplain Entity} to be used in the comparison.
   * @return -1 if e1 is less than e2; 0 if e1 and e2 are equal 1 if e2 is greater than e1
   */
  @Override
  public int compare(E e1, E e2) {
    Fitness f1 = e1.getFitness();
    Fitness f2 = e2.getFitness();

    return f1.compareTo(f2);
  }
Ejemplo n.º 2
0
  @Override
  public Vector get(Particle particle) {
    Vector newPos = (Vector) delegate.get(particle);

    Particle tmp = particle.getClone();
    tmp.setPosition(newPos);
    Fitness newFitness = particle.getBehaviour().getFitnessCalculator().getFitness(tmp);

    final UniformDistribution uniform = new UniformDistribution();
    Vector newPBest =
        newPos.plus(
            Vector.newBuilder()
                .repeat(newPos.size(), Real.valueOf(1.0))
                .build()
                .multiply(
                    new P1<Number>() {
                      @Override
                      public Number _1() {
                        return uniform.getRandomNumber(
                            -granularity.getParameter(), granularity.getParameter());
                      }
                    }));
    tmp.setPosition(newPos);
    Fitness newPBestFitness = particle.getBehaviour().getFitnessCalculator().getFitness(tmp);

    if (newPBestFitness.compareTo(newFitness) < 0) {
      Vector tmpVector = Vector.copyOf(newPos);
      newPos = newPBest;
      newPBest = tmpVector;

      newPBestFitness = newFitness;
    }

    double dot =
        ((Vector) particle.getNeighbourhoodBest().getBestPosition())
            .subtract(newPos)
            .dot(newPBest.subtract(newPos));

    if (dot < 0) {
      return (Vector) particle.getPosition();
    }

    particle.put(Property.BEST_POSITION, newPBest);
    particle.put(Property.BEST_FITNESS, newPBestFitness);

    return newPos;
  }