A Sparse FNN is a network that guarantees single-switch latency and full link bandwidth per PE pair on a selected set of parallel communication patterns. A SFNN scales from a few tens of nodes, to tens of thousands of nodes, and higher as the design tools improve.
The tools for making use of Sparse FNN technology are still under construction. We have developed a very fast heuristic for finding Sparse FNNs, but the user interface and surrounding tools are still in very early stages. When we have these tools in better shape, they will be released here.
The main problem with Universal FNNs is their limited scalability. To get the latency, bandwidth, and cost benefits of FNNs for larger clusters, one needs to relax the FNN design constraints. Instead of guaranteeing all PE pairs have single switch latency (and link bandwidth), we only need to guarantee these FNN properties for PE pairs that will communicate in significant quantities and/or at high frequency. See the above publications for more detail.
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