For those interested, these are the current timings for the likelihoods I've rewritten for numexpr.
The gist seems to be that at small sizes, numexpr is much slower. At larger sizes it is comparable …
@Thargoid wrote up some back story for a few different factions here:
https://github.com/Thargoid/pioneer/wiki/Story
We know we need factions. We're pretty much in a position to start implementing. …