docs: public static JavaRDD<MultiDataSet> mapRRMDSI(JavaRDD<List<Writable>> rdd, RecordReaderMultiDataSetIterator iterator){
          checkIterator(iterator, 1, 0);
          return mapRRMDSIRecords(rdd.map(new Function<List<Writable>,DataVecRecords>(){
              @Override
              public DataVecRecords call(List<Writable> v1) throws Exception {
                  return new DataVecRecords(Collections.singletonList(v1), null);
              }
          }), iterator);
      }