tbh there is not much to write about, at least not yet - the hiccups were around the OSX build for pytorch bindings - the torch complains that one needs to ignore, the C++ compiler options and the shared libs - nothing that the basic hackery wont’ solve 
but… there is one more serious problem that responding to you helped me to realize - which is that - the target deployment env is Windows, and there is no pytorch CTC version available - which means i need to do the porting… think this should be doable (though it also depends on the pytorch Windows version availability/stability (yes, saw your post on twitter on this))
ETA: i’m doing the training on Ubuntu with GPU, but the dev is mostly on Mac