From: RTiSR: a review-driven time interval-aware sequential recommendation method
Symbols | Definitions |
---|---|
U , \( \mathcal {V} \) | The user set and item set |
\( u\in {U} \), \( v \in \mathcal {V} \) | A user and an item |
\( \mathcal {S}^u \), \( \mathcal {S}^v \) | The behavior sequences of user u and item v |
\( \mathcal {D}^u \), \( \mathcal {D}^v \) | Review sequence of user u and item v corresponding to \( \mathcal {S}^u \), \( \mathcal {S}^v \) |
\( T^u \), \(T^v \) | Timestamp sequence of user u and item v corresponding to \( \mathcal {S}^u \), \( \mathcal {S}^v \) |
\( D_v^u \) | User u writes a review on item v |
\( y^u_v \), \( \hat{y}^u_v \) | The true and estimated rating |
\( \textbf{o}^u, \textbf{o}^v \) | User and item representation with size of \( d_o \) |
m | The number of words in a review text |
\( n_c \) | The number of convolution filters |
\( d_w \) | The dimension of each word vector |
\( d_l \) | The dimension of hidden state in LSTM |
\( d_o \) | The dimension of user/item representation |
\( \oplus \) | The concatenation operator |
\( \odot \) | The element-wise product operator |