docs: private List<ORCLUSCluster> initialSeeds(Relation<V> database, int k) {
      DBIDs randomSample = DBIDUtil.randomSample(database.getDBIDs(), k, rnd);
      List<ORCLUSCluster> seeds = new ArrayList<>(k);
      for(DBIDIter iter = randomSample.iter(); iter.valid(); iter.advance()) {
        seeds.add(new ORCLUSCluster(database.get(iter).toArray(), iter));
      }
      return seeds;
    }