Scikit Learn is probably the biggest machine learning library that you can find in the Python world. It dates back from almost 10 years ago when David Konapol was doing a Google Summer of Code to a kickstart, the Scikit Learn project. In 2010 with colleagues at Inuia in France we decided to basically try to make it bigger and really try to build a community around this. The Netflix guys were actually using the SciKit Learn not just some other machine learning systems.