A Service Recommendation Method Based on Requirements for the Cloud Environment

Algorithm 2

Recommendation process.

Input: dataset
Output: a recommendation list including services
(1)	Construct user communities via Algorithm 1;
(2)	Find the community that the target user belongs to;
(3)	for each user () in do
(4)	Obtain the similarity using (3);
(5)	end for
(6)	Obtain neighboring users with higher similarity from ;
(7)	services that the users interact with;
(8)	Remove the services with lower ratings from to obtain ;
(9)	for each service in do
(10)	Obtain the requirement vectors and () using (4);
(11)	Calculate the matching degrees and () using (5);
(12)	Calculate the predicted rating of the th dimension QoS using (6);
(13)	end for
(14)	Sort the predicted ratings of all services in in descending order, and select the first services to form a list of recommendations.