How do we calculate AUC for SASRec?

Hello!

I am currently working on CTR and Sequential Recommendation Tasks. I see many recent papers like TallRec uses AUC to compare their result with SASRec. I am really curious as to how can I calculate AUC for SASRec. In my understanding SASRec require metrics like NDCG@k and HitRate@k. It would be really helpful if you could shed some light on it.

Thanks and Regards
Millennium Bismay