Slice a dataset

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)

Arguments

dataset	Object of class lgb.Dataset
idxset	an integer vector of indices of rows needed

Value

constructed sub dataset

Examples

# \donttest{
setLGBMthreads(2L)
data.table::setDTthreads(1L)
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")
# }