core/src/main/java/org/apache/sdap/mudrod/utils/MatrixUtil.java [186:207]:
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      private static final long serialVersionUID = 1L;

      @Override
      public Tuple2<List<Long>, List<Double>> call(Tuple2<List<Long>, List<Double>> arg0, Tuple2<List<Long>, List<Double>> arg1) throws Exception {
        arg0._1.addAll(arg1._1);
        arg0._2.addAll(arg1._2);
        return new Tuple2<>(arg0._1, arg0._2);
      }
    }).mapToPair(new PairFunction<Tuple2<String, Tuple2<List<Long>, List<Double>>>, String, Vector>() {
      /**
       *
       */
      private static final long serialVersionUID = 1L;

      @Override
      public Tuple2<String, Vector> call(Tuple2<String, Tuple2<List<Long>, List<Double>>> arg0) throws Exception {
        int docsize = arg0._2._1.size();
        int[] intArray = new int[docsize];
        double[] doubleArray = new double[docsize];
        for (int i = 0; i < docsize; i++) {
          intArray[i] = arg0._2._1.get(i).intValue();
          doubleArray[i] = arg0._2._2.get(i).intValue();
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core/src/main/java/org/apache/sdap/mudrod/utils/MatrixUtil.java [316:337]:
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      private static final long serialVersionUID = 1L;

      @Override
      public Tuple2<List<Long>, List<Double>> call(Tuple2<List<Long>, List<Double>> arg0, Tuple2<List<Long>, List<Double>> arg1) throws Exception {
        arg0._1.addAll(arg1._1);
        arg0._2.addAll(arg1._2);
        return new Tuple2<>(arg0._1, arg0._2);
      }
    }).mapToPair(new PairFunction<Tuple2<String, Tuple2<List<Long>, List<Double>>>, String, Vector>() {
      /**
       *
       */
      private static final long serialVersionUID = 1L;

      @Override
      public Tuple2<String, Vector> call(Tuple2<String, Tuple2<List<Long>, List<Double>>> arg0) throws Exception {
        int docsize = arg0._2._1.size();
        int[] intArray = new int[docsize];
        double[] doubleArray = new double[docsize];
        for (int i = 0; i < docsize; i++) {
          intArray[i] = arg0._2._1.get(i).intValue();
          doubleArray[i] = arg0._2._2.get(i).intValue();
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