The Forest_Drive function uses a training data set to generate a predictive model. You can input the model to the Forest_Predict function, which uses it to make predictions.
Aster Analytics provides a tree_size_estimator function that you can use to estimate maximum values for the arguments TreeSize and NumTrees, based on the cluster configuration and the number of predictor variables. The syntax is:
SELECT * FROM tree_size_estimator (ON inputtable NumericInputs ('predictor' [,…]));
The query results includes a row_count column. The average value of this column is the recommended maximum value for the argument NumTrees.