To exploit interactions between different tasks, the message passing mechanism aggregates predictions of different tasks from the previous iteration, and uses this knowledge to update the shared latent vectors {h s 1 , ..., h s n } at the current iteration.
the message passing mechanism integrates knowledge fromŷ ae i ,ŷ as i ,ŷ ds , a ds i , and a dd i computed on an input {x 1 , ..., x n }, and the shared hidden vector h s i is updated as follows: where t > 0 and [:] denotes the concatenation operation.