Set reg_lambda=1e-5 for scikit-learn-like random forest classes. (#4558)
Set reg_lambda=1e-5 for scikit-learn-like random forest classes. (#4558)


dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost,dmlc/xgboost