Neighbor Similarity Based Agglomerative Method for Community Detection in Networks

Algorithm 3

PCM(, ): merge small or sparse communities.

Input:  , the preliminary community structure; , the community-metric threshold

Output:  , the final community structure

1  Initialize , which is used to record the community structure:

2  Calculate the community metric for each of the preliminary communities:

foreach    do

3  Select the community with the minimal community metric, denote its index as :

4  Identify the most similar community with , denote its index as :

5  Merge communities and to form a new community:

; ;

6  Calculate the community metric for the new community:

7  Replace the two communities and with the new community to reflect the merging effect:

8  Repeat steps 3 through 7, until

9  return