Time-Series Lookahead

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Apr 2, 2022, 5:39:05 PM4/2/22
to RecSys-Challenge-2022
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

Nick Landia

Apr 4, 2022, 10:56:37 AM4/4/22
to RecSys-Challenge-2022

short answer: it's c).

As background information for everyone, this page has details about the training test split: http://www.recsyschallenge.com/2022/dataset.html

For the rule mentioned, it means when you train the model only use the data from the training file, don't use any data from the leaderboard or final test set files. When predicting, treat each test session independently of all other test sessions. I.e. when predicting for test session B the model should not have any knowledge of test session A even if that came before it in terms of time stamp.
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jiwei liu

May 19, 2022, 3:52:56 PM5/19/22
to RecSys-Challenge-2022
Thank you for the clarification. Could you please update the rule with your message above? It is broader than what the rule says. The rule literally just forbids training with test data. But what you said here also forbids test time augmentation using other sessions and post-processing of predictions using other sessions in the test data. I'm not sure everyone in the competition sees this thread. It should be clearly stated as part of the rule officially in the competition web page.

Best regards,

Nick Landia

May 20, 2022, 10:39:54 AM5/20/22
to RecSys-Challenge-2022
yes, good shout
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