Table 2: Performance comparison with vanilla SRSs trained with the original 'Plain' setting and our BirDRec framework. Improv. means the relative improvement of BirDRec over the 'Plain' setting. The significance of the improvement is determined by a paired t-test with  $p \leq 0.001$ .
Datasets	ML-1M	Beauty
Backbones	Settings	HR@5	HR@10	NDCG@5	NDCG@10	MRR	HR@5	HR@10	NDCG@5	NDCG@10	MRR
FPMC	Plain	0.1317	0.2087	0.0821	0.1069	0.0929	0.0315	0.0527	0.0201	0.0259	0.0244
BirDRec	0.1534	0.2407	0.0972	0.1251	0.1059	0.0513	0.0750	0.0348	0.0423	0.0379
Improv.	16.48%	15.33%	18.39%	17.03%	13.99%	62.86%	42.31%	73.13%	63.32%	55.33%
Caser	Plain	0.1592	0.2450	0.1023	0.1272	0.1099	0.0377	0.0574	0.0245	0.0308	0.0279
BirDRec	0.2091	0.2872	0.1426	0.1666	0.1443	0.0445	0.0638	0.0307	0.0369	0.0334
Improv.	31.34%	17.22%	39.39%	30.97%	31.30%	18.04%	11.15%	25.31%	19.81%	19.71%
GRU4Rec	Plain	0.1597	0.2427	0.1044	0.1304	0.1126	0.0293	0.0470	0.0186	0.0243	0.0228
BirDRec	0.2167	0.2973	0.1495	0.1751	0.1511	0.0526	0.0761	0.0357	0.0434	0.0386
Improv.	35.69%	22.50%	43.20%	34.28%	34.19%	79.52%	61.91%	91.94%	78.60%	69.30%
SASRec	Plain	0.1769	0.2662	0.1168	0.1451	0.1252	0.0475	0.0691	0.0313	0.0385	0.0343
BirDRec	0.2352	0.3259	0.1631	0.1915	0.1647	0.0653	0.0903	0.0459	0.0537	0.0482
Improv.	32.96%	22.43%	39.64%	31.98%	31.55%	37.47%	30.68%	46.65%	39.48%	40.52%
BERT4Rec	Plain	0.1736	0.2655	0.1142	0.1429	0.1219	0.0356	0.0563	0.0231	0.0293	0.0271
BirDRec	0.2319	0.3152	0.1613	0.1871	0.1622	0.0649	0.0896	0.0466	0.0544	0.0489
Improv.	33.58%	18.72%	41.24%	30.93%	33.06%	82.30%	59.15%	101.73%	85.67%	80.44%
MAGNN	Plain	0.1802	0.2692	0.1196	0.1479	0.1265	0.0566	0.0798	0.0380	0.0455	0.0403
BirDRec	0.2341	0.3211	0.1628	0.1903	0.1649	0.0634	0.0890	0.0435	0.0518	0.0456
Improv.	29.91%	19.28%	36.12%	28.67%	30.36%	12.01%	11.53%	14.47%	13.85%	13.15%
Datasets	Yelp	OK-Vedio
FPMC	Plain	0.0502	0.0754	0.0398	0.0431	0.0425	0.0483	0.0803	0.0303	0.0405	0.0384
BirDRec	0.0743	0.0914	0.063	0.0686	0.0673	0.0756	0.1193	0.0483	0.0624	0.0569
Improv.	48.01%	21.22%	58.29%	59.16%	58.35%	56.52%	48.57%	59.41%	54.07%	48.18%
Caser	Plain	0.0337	0.0519	0.0228	0.0286	0.0277	0.0498	0.0831	0.0314	0.0421	0.0396
BirDRec	0.0651	0.0818	0.0519	0.0571	0.0548	0.0746	0.1221	0.0479	0.0632	0.0573
Improv.	93.18%	57.61%	127.63%	99.65%	97.83%	49.80%	46.93%	52.55%	50.12%	44.70%
GRU4Rec	Plain	0.0320	0.0530	0.0198	0.0265	0.0257	0.0485	0.0816	0.0305	0.0410	0.0388
BirDRec	0.0741	0.0921	0.0602	0.0659	0.0638	0.0776	0.1253	0.0497	0.0651	0.0591
Improv.	131.56%	73.77%	204.04%	148.68%	148.25%	60.00%	53.55%	62.95%	58.78%	52.32%
SASRec	Plain	0.0404	0.0574	0.0295	0.0349	0.0341	0.0511	0.0858	0.0326	0.0435	0.0408
BirDRec	0.0771	0.0965	0.0626	0.0687	0.0663	0.0815	0.1306	0.0523	0.0682	0.0616
Improv.	90.84%	68.12%	112.20%	96.85%	94.43%	59.49%	52.21%	60.43%	56.78%	50.98%
BERT4Rec	Plain	0.0421	0.0597	0.0318	0.0375	0.0368	0.0558	0.0925	0.0354	0.0473	0.0442
BirDRec	0.0734	0.0918	0.0597	0.0657	0.0635	0.0817	0.1297	0.0524	0.0677	0.0613
Improv.	74.35%	53.77%	87.74%	75.20%	72.55%	46.42%	40.22%	48.02%	43.13%	38.69%
MAGNN	Plain	0.0436	0.0602	0.0337	0.0388	0.0383	0.0529	0.0880	0.0344	0.0452	0.0426
BirDRec	0.0560	0.0792	0.0413	0.0488	0.0465	0.0742	0.1184	0.0479	0.0619	0.0565
Improv.	28.44%	31.56%	22.55%	25.77%	21.41%	40.26%	34.55%	39.24%	36.95%	32.63%