Function xgboost_sys::XGBoosterLoadModelFromBuffer

pub unsafe extern "C" fn XGBoosterLoadModelFromBuffer(
    handle: BoosterHandle,
    buf: *const c_void,
    len: bst_ulong
) -> c_int

\brief load model from in memory buffer \param handle handle \param buf pointer to the buffer \param len the length of the buffer \return 0 when success, -1 when failure happens