public static DataSet<Centroid> getDefaultCentroidDataSet(ExecutionEnvironment env) {
List<Centroid> centroidList = new LinkedList<Centroid>();
for (Object[] centroid : CENTROIDS) {
centroidList.add(
new Centroid((Integer) centroid[0], (Double) centroid[1], (Double) centroid[2]));
}
return env.fromCollection(centroidList);
}