MADlib is an open-source library for scalable in-database analytics. It
provides data-parallel implementations of mathematical, statistical and
machine learning methods for structured and unstructured data.

The MADlib mission: to foster widespread development of scalable
analytic skills, by harnessing efforts from commercial practice,
academic research, and open-source development.

To more information, please see the MADlib wiki at
https://cwiki.apache.org/confluence/display/MADLIB