> Being written in 1995, the training set is independent of the test set There is an important bias effect in play. OF the books written in the past about the

> Being written in 1995, the training set is independent of the test set There is an important bias effect in play. OF the books written in the past about the rise of tyranny, not all are brought up equally in discussions. It is easy to observe that people upvote articles that support their ideology and flag articles (concrete example: the recent terror attacks were flagkilled off the front page) that go against it. The articles that make it though this filter are not independent of the test set.