lightgbm (version 4.5.0)

lgb.slice.Dataset: Slice a dataset

Description

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

Renamed from slice() in 4.4.0

Usage

lgb.slice.Dataset(dataset, idxset)

Value

constructed sub dataset

Arguments

dataset

Object of class lgb.Dataset

idxset

an integer vector of indices of rows needed

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 <- lgb.slice.Dataset(dtrain, seq_len(42L))
lgb.Dataset.construct(dsub)
labels <- lightgbm::get_field(dsub, "label")
# }