A Service Recommendation Method Based on Requirements for the Cloud Environment

Algorithm 1

Construction of user community.

Input: data , centers of the initial user communities
Output: user communities
(1)	repeat
(2)	for each user that does not belong to the set {} do
(3)	;
(4)	for each () do
(5)	compute the similarity between and using (3);
(6)	ifthen
(7)	;
(8)	; //record the center
(9)	end if
(10)	end for
(11)	Add to the community ;
(12)	end for
(13)	for each () do//the center of each community is redetermined
(14)	for each service () do
(15)	;
(16)	end for
(17)	;
(18)	for each user in do
(19)	);
(20)	;
(21)	ifthen
(22)	;
(23)	; //update the center
(24)	end if
(25)	end for
(26)	end for
(27)	until each () converge