Active learning score

Active learning score formula

The active learning score is a metric used by the content selection algorithm for rating, to choose the second video given a first video.

Currently, it is composed of four terms:

• The first term favors videos whose scores are similar to the first video.
• The second term favors videos whose scores are highly uncertain.
• The third term favors videos that are rarely skipped the contributor, to avoid querying the contributor on videos that they may misremember.
• The fourth term is a noise to create diversity.