1params = {"objective":"reg:linear",'colsample_bytree': 0.3,'learning_rate': 0.1,
2 'max_depth': 5, 'alpha': 10}
3
4cv_results = xgb.cv(dtrain=data_dmatrix, params=params, nfold=3,
5 num_boost_round=50,early_stopping_rounds=10,metrics="rmse", as_pandas=True, seed=123)
6