User cold start recommendation algorithm based on collaborative filtering hybrid filling
A collaborative filtering and recommendation algorithm technology, applied in the field of recommendation, can solve problems such as underutilization of scoring information, user cold start problem to be solved, ignoring scoring information, etc., to reduce data sparsity, solve cold start problem, improve The effect of precision
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[0037] A user cold-start recommendation algorithm based on collaborative filtering and mixed filling in the present invention is carried out sequentially according to the following steps:
[0038] A. Use the two-dimensional table T={U, I, R} to represent the user's rating matrix for the item:
[0039] In the two-dimensional table T, U={U u} represents the set of users, u={1,2,3,...,|u|}, |u| represents the total number of users, where Uv∈U but v≠u; I={I i} represents the collection of items, i={1,2,3,...,|i|}, |i| represents the total number of items, among them, Ij∈I but j≠i; R={R U1,I1 , R U1,I2 ,...,R Uu,Ii}Represents the set of user ratings on items, where R Uu,Ii Indicates user U u For item I i rating; if user U u For item I i Not rated, R on the scale Uu,Ii is the default value;
[0040] Specifically as shown in Table 2:
[0041] Table 2
[0042] I 1
I 2
I 3
I 4
I 5
I 6
I 7
I 8
U 1
1 4 * 4 5 5 2 3 U...
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