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	an 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, seq_len(42L))
lgb.Dataset.construct(dsub)
labels <- lightgbm::getinfo(dsub, "label")