If you want to use validation data, you should set reference to training data

lgb.Dataset.set.reference(dataset, reference)

Arguments

dataset

object of class lgb.Dataset

reference

object of class lgb.Dataset

Value

passed dataset

Examples

data(agaricus.train, package ="lightgbm") train <- agaricus.train dtrain <- lgb.Dataset(train$data, label = train$label) data(agaricus.test, package = "lightgbm") test <- agaricus.test dtest <- lgb.Dataset(test$data, test = train$label) lgb.Dataset.set.reference(dtest, dtrain)