import cc.mallet.types.Metric; //导入依赖的package包/类
/**
 * Construct a KMeans object
 * 
 * @param instancePipe Pipe for the instances being clustered
 * @param numClusters Number of clusters to use
 * @param metric Metric object to measure instance distances
 * @param emptyAction Specify what should happen when an empty cluster occurs
 */
public KMeans(Pipe instancePipe, int numClusters, Metric metric,
    int emptyAction) {

  super(instancePipe);

  this.emptyAction = emptyAction;
  this.metric = metric;
  this.numClusters = numClusters;

  this.clusterMeans = new ArrayList<SparseVector>(numClusters);
  this.randinator = new Random();

}