docs: protected WritableDataStore<Meta> initializeMeta(Relation<V> relation, double[][] means) {
      NumberVectorDistanceFunction<? super V> df = getDistanceFunction();
      // The actual storage
      final WritableDataStore<Meta> metas = DataStoreUtil.makeStorage(relation.getDBIDs(), DataStoreFactory.HINT_HOT | DataStoreFactory.HINT_TEMP, Meta.class);
      // Build the metadata, track the two nearest cluster centers.
      for(DBIDIter id = relation.iterDBIDs(); id.valid(); id.advance()) {
        Meta c = new Meta(k);
        V fv = relation.get(id);
        for(int i = 0; i < k; i++) {
          final double d = c.dists[i] = df.distance(fv, DoubleVector.wrap(means[i]));
          if(i > 0) {
            if(d < c.dists[c.primary]) {
              c.primary = i;
            }
            else if(d > c.dists[c.secondary]) {
              c.secondary = i;
            }
          }
        }
        metas.put(id, c);
      }
      return metas;
    }