Recommendation Algorithm in Double-Layer Network Based on Vector Dynamic Evolution Clustering and Attention Mechanism

Table 1

Notations and explanations.

Notations	Explanations
	The number of users
	The number of items
	Attribute vector of user
	Attribute vector of item
	Original score of user to item
	Rating time of user to item
	Attribute similarity between users and
	Rating similarity between users and
	Similarity matrix between users
	Attribute similarity between items and
	Rating similarity between items and
	Similarity matrix between items
	Attention matrix of user to item
	Attention matrix of item to user
	State vector of user node at time
	State vector of item node at time