ConcurrentModificationException from Multinomial

BallKMeans.java

  // Re-weight everything according to the minimum distance to a seed.
      for (int currSeedIndex : seedSelector) {
        WeightedVector curr = datapoints.get(currSeedIndex);
        double newWeight = nextSeed.getWeight() * distanceMeasure.distance(nextSeed, curr);
        if (newWeight < seedSelector.getWeight(currSeedIndex)) {
          seedSelector.set(currSeedIndex, newWeight);
        }
      }