Semidefinite Programming for Community Detection With Side Information

• Published in: IEEE transactions on network science and engineering Vol. 8; no. 2; pp. 1957 - 1973
• Main Authors: Esmaeili, Mohammad, Saad, Hussein Metwaly, Nosratinia, Aria
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.04.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Analytical models; Asymptotic methods; Asymptotic properties; Censored Block Model; Community Detection; Computational modeling; Graphs; Labels; Maximum likelihood detection; Maximum likelihood estimation; Noise measurement; Random variables; Recovery; SDP; Semidefinite programming; Side Information; Stochastic Block Model; Stochastic processes
• ISSN: 2327-4697; 2334-329X
• DOI: 10.1109/TNSE.2021.3078612

This paper produces an efficient semidefinite programming (SDP) solution for community detection that incorporates non-graph data, which in this context is known as side information. SDP is an efficient solution for standard community detection on graphs. We formulate a semi-definite relaxation for the maximum likelihood estimation of node labels, subject to observing both graph and non-graph data. This formulation is distinct from the SDP solution of standard community detection, but maintains its desirable properties. We calculate the exact recovery threshold for three types of non-graph information, which in this paper are called side information: partially revealed labels, noisy labels, as well as multiple observations (features) per node with arbitrary but finite cardinality. We find that SDP has the same exact recovery threshold in the presence of side information as maximum likelihood with side information. Thus, the methods developed herein are computationally efficient as well as asymptotically accurate for the solution of community detection in the presence of side information. Simulations show that the asymptotic results of this paper can also shed light on the performance of SDP for graphs of modest size.