SPARK-13944 is all done, we should all think about what the "next steps" might be for mllib-local. E.g., it could be "improve Spark's linear algebra", or "investigate how we will implement local models/pipelines in Spark", etc.
This ticket is for comments, ideas, brainstormings and PoCs. The separation of linalg into a standalone project turned out to be significantly more complex than originally expected. So I vote we devote sufficient discussion and time to planning out the next move