Below are the preferences at the various sites for work in one of the different machine-learning paradigms. Please contact site coordinators for more information.
feat. grammars, automata (Brill)
feat. grammars, ILP
EBL, ILP, genetic
ILP, neural nets
ILP, decision trees, rule induction
Although none of the sites lists a study of the theoretical complexity of the learning tasks, there is interest in this as well. Contact the coordinator in case you are interested and capable.