I am very optimistic concerning our plans to make Leaf work in a distributed fashion. It's not quite finalized yet, but the rough outline consists of abstracting other parts of the Network away as a special type of layer and using capnproto + zeromq for transportation. Sadly I haven't come across a good implementation of model parallelism to learn from, so that might become a bit tricky.

I think there is still a lot of room for improvement for layer-based networks, but even if the graph-based approach will become more prelevant I think the Rust trait system gives us great tools to migrate and reuse a lot from our layer based approach.