The algorithm achieves significantly higher accuracy if it has more text per author. Also, if you're willing to do human analysis on a few dozen candidates afte

The algorithm achieves significantly higher accuracy if it has more text per author. Also, if you're willing to do human analysis on a few dozen candidates after algorithmically shortlisting them, that gives you a further advantage. Finally, there is much room for straightforward algorithmic improvement (e.g., ensembles of classifiers) that we didn't have time to fully investigate. In short, IMO it's just a matter of more data and slightly better ML, not fundamental improvements.