How to measure the relevance between user and item in the next week?

[Cherishzhang]

Relevant items are those items on which a user clicked, bookmarked or replied (interaction_type= 1, 2 or 3). 

I want to build a local evaluation, But I has a question, how to measure it? Just by the value of the interaction_type, or related to the interaction create time, or related to the times the item interacted by the user.

[dkohlsdorf]

You could slice the data by date and then try to predict the clicked items in that time.
The formulas are given to you at: https://github.com/recsyschallenge/2016/blob/master/EvaluationMeasure.md

Daniel

[Cherishzhang]

@dkohlsdorf , thanks for your reply!