// grow a forest with m=1
treeBuilder.setM(1);
time = System.currentTimeMillis();
log.info("Growing a forest with m=1");
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();