Table 3. HDL based recommendation system performance.

Combination	Confusion matrix				Parameters				Performance indexes
	Category	H	M	L	TP	FP	TN	FN	Acc	Re	Pr	F1
HDL + SGD	High	235	7	8	235	13	487	15	96.27	94.00	97.40	95.67
	Medium	5	239	6	239	13	487	11	96.80	95.60	97.40	96.49
	Low	8	6	236	236	14	486	14	96.27	94.40	97.20	95.78
HDL + RMSProp	High	242	4	4	242	8	492	8	97.87	96.80	98.40	97.59
	Medium	4	243	3	243	7	493	7	98.13	97.20	98.60	97.89
	Low	4	3	243	243	7	493	7	98.13	97.20	98.60	97.89
HDL + Adam	High	246	2	2	246	2	498	4	99.20	98.40	99.60	99.00
	Medium	1	247	2	247	3	497	3	99.20	98.80	99.40	99.10
	Low	1	1	248	248	4	496	2	99.20	99.20	99.20	99.20