Slice a dataset

Get a new lgb.Dataset containing the specified rows of original lgb.Dataset object

slice(dataset, ...)

# S3 method for lgb.Dataset
slice(dataset, idxset, ...)

Arguments

dataset	Object of class "lgb.Dataset"
...	other parameters (currently not used)
idxset	a integer vector of indices of rows needed

Value

constructed sub dataset

Examples

library(lightgbm)
data(agaricus.train, package = "lightgbm")
train <- agaricus.train
dtrain <- lgb.Dataset(train$data, label = train$label)

dsub <- lightgbm::slice(dtrain, 1:42)
lgb.Dataset.construct(dsub)
labels <- lightgbm::getinfo(dsub, "label")