[Touche]

I'm confused, Haxl is an open source library, right? So what are you using Haxl for at facebook?

[nbm]

The blog post - https://code.facebook.com/posts/302060973291128/open-sourcin... - describes the initial usage - to assist the Sigma system in answering questions like "Is this content spam?".

Some background on that system, including the FXL component that Haxl replaces, is here: http://research.microsoft.com/en-us/projects/ldg/a10-stein.p...