Function xgboost_sys::XGBoosterEvalOneIter

pub unsafe extern "C" fn XGBoosterEvalOneIter(
    handle: BoosterHandle,
    iter: c_int,
    dmats: *mut DMatrixHandle,
    evnames: *mut *const c_char,
    len: bst_ulong,
    out_result: *mut *const c_char
) -> c_int

\brief get evaluation statistics for xgboost \param handle handle \param iter current iteration rounds \param dmats pointers to data to be evaluated \param evnames pointers to names of each data \param len length of dmats \param out_result the string containing evaluation statistics \return 0 when success, -1 when failure happens