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Table 1 Notations

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