Based on these datasets, many well-known recommendation methods have been developed.
we compare 6 methods, including simple average of the representations of previously clicked news (Average), attention mechanism used in (wu et al., 2019a) (Attention), candidate-aware attention used in (wang et al., 2018) (Candidate-Att), gated recurrent unit used in (Okura et al., 2017) (GRU), long-and short-term user representation used in ) (LSTUR) and multi-head self-attention used in (wu et al., 2019c) (Self-Att).