code: public static SingleCSVRecord fromRow(DataSet row) {
          if (!row.getFeatures().isVector() && !row.getFeatures().isScalar())
              throw new IllegalArgumentException("Passed in dataset must represent a scalar or vector");
          if (!row.getLabels().isVector() && !row.getLabels().isScalar())
              throw new IllegalArgumentException("Passed in dataset labels must be a scalar or vector");
          //classification
          SingleCSVRecord record;
          int idx = 0;
          if (row.getLabels().sumNumber().doubleValue() == 1.0) {
              String[] values = new String[row.getFeatures().columns() + 1];
              for (int i = 0; i < row.getFeatures().length(); i++) {
                  values[idx++] = String.valueOf(row.getFeatures().getDouble(i));
              }
              int maxIdx = 0;
              for (int i = 0; i < row.getLabels().length(); i++) {
                  if (row.getLabels().getDouble(maxIdx) < row.getLabels().getDouble(i)) {
                      maxIdx = i;
                  }
              }
  
              values[idx++] = String.valueOf(maxIdx);
              record = new SingleCSVRecord(values);
          }
          //regression (any number of values)
          else {
              String[] values = new String[row.getFeatures().columns() + row.getLabels().columns()];
              for (int i = 0; i < row.getFeatures().length(); i++) {
                  values[idx++] = String.valueOf(row.getFeatures().getDouble(i));
              }
              for (int i = 0; i < row.getLabels().length(); i++) {
                  values[idx++] = String.valueOf(row.getLabels().getDouble(i));
              }
  
  
              record = new SingleCSVRecord(values);
  
          }
          return record;
      }
docs: Instantiate a csv record from a vector
  given either an input dataset and a
  one hot matrix, the index will be appended to
  the end of the record, or for regression
  it will append all values in the labels
  @param row the input vectors
  @return the record from this {@link DataSet}