Retrieve the null deviance If "train", "valid", and "xval" parameters are FALSE (default), then the training null deviance value is returned. If more than one parameter is set to TRUE, then a named vector of null deviances are returned, where the names are "train", "valid" or "xval".
h2o.null_deviance(object, train = FALSE, valid = FALSE, xval = FALSE)
Retrieve the training null deviance
Retrieve the validation null deviance
Retrieve the cross-validation null deviance