Followee Recommendation in Microblog Using Matrix Factorization Model with Structural Regularization

Table 1

Differences of applying different evaluation metrics.

Algorithm	Target user	Recommended user	Accepted user	𝑃@3	AP@3	AP′@3
Algorithm 1	𝑢1	𝑢2; 𝑢4; 𝑢3	𝑢2; 𝑢3	2/3=0.667	(1/1+2/3)/2=0.833	(1/1+2/3)/3=0.556
Algorithm 2	𝑢1	𝑢2; 𝑢3; 𝑢4	𝑢2; 𝑢3	2/3=0.667	(1/1+2/2)/2=1.000	(1/1+2/2)/3=0.667
Algorithm 3	𝑢1	𝑢2; 𝑢3; 𝑢5	𝑢2; 𝑢3; 𝑢5	3/3=1.000	(1/1+2/2+3/3)/3=1.000	(1/1+2/2+3/3)/3=1.000