Get information of an xgb.DMatrix object
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Object of class
the name of the information field to get (see details)
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
group can be setup by
setinfo but can't be retrieved by
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