| | Notation | Definition or descriptions |
| | A pair of user and item | | The id embedding of item | | The embedded features (except id) of item | | The embedded features (include id) of user | | , | Common contexts and scenario-specific contexts | | , | Item/user representation networks | | Decision-making network | | Context network | | , | Latent user/item vectors in the interest space | | , | Output vector/matrix of context network | | , | Cold-start and warmed item id embeddings in the meta-training procedure | | , | Support and query sets of a cold-start item in | | , | Predicted labels on and | | , , | Cold-start, warmed, and meta-loss in the meta-training procedure | | , , | Auxiliary, warm-start, and cold-start datasets | | , , | Ground-truth label and predicted labels of context-aware models and DisNet | | Interest-shifting operator | | | The id embeddings of top relevant items | | | Attention scores | | , | Weight matrices and bias vectors of the NN operator | | , | Weight matrices and bias vector of RM-IdEG | | , , | Parameters of attentional embedding aggregator | | , | Item sets of and |
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