*/
public void configure(int partition, Dataset dataset, TreeID[] keys, Node[] trees, int numInstances) {
this.partition = partition;
Preconditions.checkArgument(partition >= 0, "Wrong partition id : " + partition);
converter = new DataConverter(dataset);
Preconditions.checkArgument(keys.length == trees.length, "keys.length != trees.length");
int nbConcerned = keys.length;
this.keys = keys;