Sparse Network Inference under Imperfect Detection and its Application to Ecological Networks
Researchers have introduced a novel framework for structured sparse nonnegative low-rank factorization to improve the inference of latent structures in bipartite networks, particularly those used in ecological research. This method addresses limitations in existing models by incorporating detection probability estimation and imposing nonconvex $\ell_{1/2}$ regularization to promote sparsity and better relative scaling. An ADMM-based algorithm was developed to solve the resulting nonconvex and nonsmooth optimization problem, with experiments showing enhanced recovery of latent factors and network structures on both synthetic and real ecological datasets. AI
