h2o.confusionMatrix() function definition unclear in R
We need to be clear that the default is the training metrics in the R docs. For example (from `h2o.auc()`):
Retrieves the AUC value from an H2OBinomialMetrics. If "train", "valid", and "xval" parameters are FALSE (default), then the training AUC value is returned. If more than one parameter is set to TRUE, then a named vector of AUCs are returned, where the names are "train", "valid" or "xval".