<NME> FoldPartitioner.java
<BEF> package edu.neu.ccs.pyramid.application;

import edu.neu.ccs.pyramid.configuration.Config;
import edu.neu.ccs.pyramid.dataset.*;

import java.io.File;
import java.util.HashSet;
import java.util.Set;

/**
 * Created by chengli on 6/3/15.
 */
public class FoldPartitioner {
    public static void main(String[] args) throws Exception{
        Config config = new Config(args[0]);
        System.out.println(config);
        String dataType = config.getString("dataSetType");
        switch (dataType) {
            case "clf":
                partitionClfData(config);
                break;
            case "reg":
                partitionRegData(config);
                break;
            case "mlclf":
                partitionMLClfData(config);
                break;
            default:
                throw new IllegalArgumentException("illegal dataSetType");
        }

    }

    private static void partitionClfData(Config config) throws Exception{
        String input = config.getString("input.data");
        String output= config.getString("output.folder");
        int numFolds = config.getInt("numFolds");
        ClfDataSet all = TRECFormat.loadClfDataSet(input, DataSetType.CLF_SPARSE,true);
        for (int i=1;i<=numFolds;i++){
            Set<Integer> trainFold = new HashSet<>();
            for (int j=1;j<=numFolds;j++){
                if (j!=i){
                    trainFold.add(j);
                }
            }
            Set<Integer> testFold = new HashSet<>();
            testFold.add(i);
            ClfDataSet trainSet = DataSetUtil.sampleByFold(all,numFolds,trainFold);
            ClfDataSet testSet = DataSetUtil.sampleByFold(all,numFolds,testFold);

            File foldFolder = new File(output,"fold_"+i);
            foldFolder.mkdirs();
            TRECFormat.save(trainSet,new File(foldFolder,"train"));
            TRECFormat.save(testSet,new File(foldFolder,"test"));
        }
    }



    private static void partitionMLClfData(Config config) throws Exception{
        String input = config.getString("input.data");
        String output= config.getString("output.folder");
        int numFolds = config.getInt("numFolds");
        MultiLabelClfDataSet all = TRECFormat.loadMultiLabelClfDataSet(input, DataSetType.ML_CLF_SPARSE,true);
        System.out.println("data loaded");
        for (int i=1;i<=numFolds;i++){
            Set<Integer> trainFold = new HashSet<>();
            for (int j=1;j<=numFolds;j++){
                if (j!=i){
                    trainFold.add(j);
                }
            }
            Set<Integer> testFold = new HashSet<>();
            testFold.add(i);
            MultiLabelClfDataSet trainSet = DataSetUtil.sampleByFold(all,numFolds,trainFold);
            MultiLabelClfDataSet testSet = DataSetUtil.sampleByFold(all,numFolds,testFold);

            File foldFolder = new File(output,"fold_"+i);
            foldFolder.mkdirs();
            TRECFormat.save(trainSet,new File(foldFolder,"train"));
            TRECFormat.save(testSet,new File(foldFolder,"test"));
        }
    }

    private static void partitionRegData(Config config) throws Exception{

        String input = config.getString("input.data");
        String output= config.getString("output.folder");
        int numFolds = config.getInt("numFolds");
        RegDataSet all = TRECFormat.loadRegDataSet(input, DataSetType.REG_SPARSE,true);
        for (int i=1;i<=numFolds;i++){
            Set<Integer> trainFold = new HashSet<>();
            for (int j=1;j<=numFolds;j++){
                if (j!=i){
                    trainFold.add(j);
                }
            }
            Set<Integer> testFold = new HashSet<>();
            testFold.add(i);
            RegDataSet trainSet = DataSetUtil.sampleByFold(all,numFolds,trainFold);
            RegDataSet testSet = DataSetUtil.sampleByFold(all,numFolds,testFold);

            File foldFolder = new File(output,"fold_"+i);
            foldFolder.mkdirs();
            TRECFormat.save(trainSet,new File(foldFolder,"train"));
            TRECFormat.save(testSet,new File(foldFolder,"test"));
        }
    }



}

<MSG> more main function

<DFF> @@ -13,6 +13,10 @@ import java.util.Set;
 public class FoldPartitioner {
     public static void main(String[] args) throws Exception{
         Config config = new Config(args[0]);
+        main(config);
+    }
+
+    public static void main(Config config) throws Exception{
         System.out.println(config);
         String dataType = config.getString("dataSetType");
         switch (dataType) {

more main function