Security and Communication Networks / 2018 / Article / Alg 2

Research Article

Differentially Private Recommendation System Based on Community Detection in Social Network Applications

Algorithm 2

CDAI recommendation method.
Input: ;
The known labels of users;
Output:The unknown labels of users;
Phase 1: Get the coarse-grained , List A
Get a new social network graph G’
Initiallize Each Node to a Separated Community
Remove i from its community, place to j’s community
Compute the composite modularity gain
end for
Choose j with maximun positive gain ( if exists) and move i to j’s community
Otherwise i stays in its community
end for
until No further improvement in modularity
Gets the label probability in each community,
Find , Assign to
Assign to
Get the coarse-grained
Phase 2: Get the fine-grained for the unknow labels of users in community. Get the list B.
Users of the independent community, the labels remain the same
end if
end for
Get final

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