Excellent. For sparse storage, do you use Scipy Sparse, or you have your own custom built solution?

I know continuum was working on a version of memmapped numpy (blaze, iirc) arrays which looked really interesting.

I started with Scipy Sparse. I ditched it for a custom solution so I could support variable-length integers, run-length encoding etc.

Good work Ville, let me know when you post those slides/writeup. :-)

Thanks Peter! Let me know if you happen to visit SF. It would be nice to catch up.