* @param partitions The number of partitions
* @param holdout The holdout fraction
* @return Itself for chaining.
*/
public SimpleEvaluator addDataset(String name, DataSource source, int partitions, double holdout){
CrossfoldTask cross = new CrossfoldTask(name)
.setSource(source)
.setPartitions(partitions)
.setHoldoutFraction(holdout);
addDataset(cross);
return this;