Before revision: Online gaming is a multi-billion-dollar industry, which is growing faster than ever before  . Recommender systems (RS) for online games face unique challenges since they must fulfill players' distinct desires, at different user levels, based on their action sequences of various action types.
After revision: Online gaming is a multi-billion-dollar industry, which is growing faster than ever before , with increasing challenges of providing better user experience . Recommender systems (RS) for online games face unique challenges since they must fulfill players' distinct desires, at different user levels, based on their action sequences of various action types.