I'm digging this out again. For work I'm looking for a new workstation due to various reasons. Mostly for general ML, data crunching tasks. But also interested in deep learning. Anyway I go looking around and all the common OEMs seem to offer is the xeon + NV option with base config something stupid as a 6-core xeon but already cascade-lake.
Some more niche shops I found some threadripper 2 options. Did not find a single workstation option with an epyc rome option (only normal rack servers) and in general OEMs liek dell or hpe still seem to be deeply entrenched in intel. This is an uphill battle for AMD as if a buyer isn't looking for epyc/TR he will almost certainly not find it / get a product with it.
I'm guessing you didn't check out the following link? Just click the drop down in the categories to see options.
It looks like maybe Velocity Micro could be a fit? From 3600 to the new Epyc's it looks like.
Velocity Micro specializes in workstations optimized for Machine Learning and Deep Learning. Designed for Tensor Flow, Theano, Caffe, and Torch.
Might be best to wait for the new Threadrippers to come out if your going to pony up the $$$'s