Get a new lgb.Dataset
containing the specified rows of
original lgb.Dataset
object
slice(dataset, idxset) # S3 method for lgb.Dataset slice(dataset, idxset)
dataset | Object of class |
---|---|
idxset | an integer vector of indices of rows needed |
constructed sub dataset
# \donttest{ data(agaricus.train, package = "lightgbm") train <- agaricus.train dtrain <- lgb.Dataset(train$data, label = train$label) dsub <- lightgbm::slice(dtrain, seq_len(42L)) lgb.Dataset.construct(dsub) labels <- lightgbm::get_field(dsub, "label") # }