Function lightgbm_sys::LGBM_BoosterAddValidData

pub unsafe extern "C" fn LGBM_BoosterAddValidData(
    handle: BoosterHandle, 
    valid_data: DatasetHandle
) -> c_int

\brief Add new validation data to booster. \param handle Handle of booster \param valid_data Validation dataset \return 0 when succeed, -1 when failure happens