“…At present, efficient inference approximation methods like FITC and PITC [16,17,28,46,47,48,49,50], are not very effective for MTGPs, because in this setting, although inducing points can still be treated as free parameters, the task label should be pre-fixed. Interesting future research involves the development of sparse and efficient inference methods for MTGPs [19,51,52,53,54]. The initialization strategy [37,55,56,57] of the coupling hyperparamters C i is also very important for multitask pattern discovery, and needs further study.…”