It's not developed anymore. I still have a service in production using it: estimating the distribution of runtime of any container we launch, through joint conditional quantile regression (output of the net is p5, p10, ..., p95 of the runtime distribution).

It's a good use case for it, because it needs to be low-latency (it's in the critical path when launching a container at Netflix) and it's using a lot of sparse features to do its job (hashed tokens of a lot of poorly structured metadata about the container and its runtime).