It depends on how much data you can include in the prediction phase. If you train with karma earned right at the time of the article submission, and then predi

It depends on how much data you can include in the prediction phase. If you train with karma earned right at the time of the article submission, and then predict with the exact same methodology, it will work fine. If you put in a "fake" karma value when predicting, then it will of course not work well.