The rules specify:
- Do not use data from the test sessions in model training, use test session data only in the prediction step
Will submissions be restricted to:
a) access only item information (e.g. item popularity) from timestamps prior to the date of (or last timestamp of) each session?
b) above, but only using leaderboard or final set, respectively, not both
c) not use *any* leaderboard or final set data