data(agaricus.train, package='xgboost')
train <- agaricus.train
cv <- xgb.cv(data = train$data, label = train$label, nfold = 5, max_depth = 2,
eta = 1, nthread = 2, nrounds = 2, objective = "binary:logistic")
print(cv)
print(cv, verbose=TRUE)
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