Before revision: Community detection is a fundamental problem in social network analysis consisting , roughly speaking, in dividing social actors ( modelled as nodes in a social graph) with certain social connections ( modelled as edges in the social graph) into densely knitted and highly related groups with each group well separated from the others.
After revision: Community detection is a fundamental problem in social network analysis consisting in unsupervised dividing social actors ( modelled as nodes in a social graph) with certain social connections ( modelled as edges in the social graph) into densely knitted and highly related groups with each group well separated from the others.