Get information of an xgb.DMatrix object
Get information of an xgb.DMatrix object
getinfo(object, ...) ## S3 method for class 'xgb.DMatrix' getinfo(object, name, ...)
object |
Object of class |
... |
other parameters |
name |
the name of the information field to get (see details) |
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 ;
nrow: number of rows of the xgb.DMatrix.
group can be setup by setinfo but can't be retrieved by getinfo.
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(labels2 == 1-labels))
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