DecisionForest forestOne = forestBuilder.build(nbtrees);
sumTimeOne += System.currentTimeMillis() - time;
numNodesOne += forestOne.nbNodes();
// compute the test set error (Selection Error), and mean tree error (One Tree Error),
double[] testLabels = test.extractLabels();
double[][] predictions = new double[test.size()][];
forestM.classify(test, predictions);
double[] sumPredictions = new double[test.size()];
Arrays.fill(sumPredictions, 0.0);