Function xgboost_sys::XGBoosterCreate

pub unsafe extern "C" fn XGBoosterCreate(
    dmats: *const DMatrixHandle,
    len: bst_ulong,
    out: *mut BoosterHandle
) -> c_int

\brief create xgboost learner \param dmats matrices that are set to be cached \param len length of dmats \param out handle to the result booster \return 0 when success, -1 when failure happens