Set information of an xgb.DMatrix object
Set information of an xgb.DMatrix object
setinfo(object, ...) ## S3 method for class 'xgb.DMatrix' setinfo(object, name, info, ...)
object |
Object of class "xgb.DMatrix" |
... |
other parameters |
name |
the name of the field to get |
info |
the specific field of information to set |
The name field can be one of the following:
label: label Xgboost learn from ;
weight: to do a weight rescale ;
base_margin: base margin is the base prediction Xgboost will boost from ;
group: number of rows in each group (to use with rank:pairwise objective).
data(agaricus.train, package='xgboost') train <- agaricus.train dtrain <- xgb.DMatrix(train$data, label=train$label) labels <- getinfo(dtrain, 'label') setinfo(dtrain, 'label', 1-labels) labels2 <- getinfo(dtrain, 'label') stopifnot(all.equal(labels2, 1-labels))
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