To conduct a fair comparison among the different methods described in Section 2, we compare these methods when applied to our base model using the development set of the datasets.
we use a smaller version of our base model (with dimensions set to 64) and incorporate the user and product attributes using nine different approaches: (1) bias-attention: the bias-based method injected to the attention mechanism, (2-5) the matrix-based method injected to four different locations (matrix-embedding, matrix-encoder, matrix-attention, matrix-classifier), and (6-9) the CHIM-based method injected to four different locations (CHIM-embedding, CHIM-encoder, CHIM-attention, CHIM-classifier).