Tag-Aware Recommender System Based on Deep Reinforcement Learning

Table 1

ML-20M dataset.

Name	Data range	Rating scale	Users	Movies
ML-20M	1/1995–3/2015	0.5–5, half-stars^∗	138493	27278
	Ratings	Tag apps	Density (rating)	Density (tag)
	20000263	465564	0.54%	0.012%

^∗MovieLens changed from a 1–5 full-star scale to a 0.5–5 half-star scale on Feb 18, 2003.