How we built Tagger News: machine learning on a tight schedule

It's worth noting for future reference that in terms of supervised learning of labels given a text document input, fasttext (https://github.com/facebookresearch/fastText) is leagues ahead of conventional approaches in both accuracy and training speed, and there is a Python interface (https://github.com/salestock/fastText.py) for use with Django/Flask (unfortunately, recent fasttext changes have broken the interface for now).