With my colleagues, I developped 2 packages available on the CRAN and on GitHub. Both of them deal with statistical learning for network data. Please contact us for any questions or discussions.
GREMLINS : S. Donnet, P. Barbillon. R-package for the statistical inference of multipartite network. Available on CRAN or github
sbm : J. Chiquet, S. Donnet & P. Barbillon. R-package for Stochastic Blockmodels. Available github or CRAN