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Scenario: We want to evaluate our recommender system, which recommends items to potential customers when visiting a product detail page.

Here are actual relevant items:

Customer 1: Item1, Item2
Customer 2: Item3, Item4, Item5, Item6, Item7
Customer 3: Item8
.....

Suppose the max number of actual relevant items per customer is 5(i.e. Customer 2).

Should I set K = 5 if we want to use MAP@K as the evaluation metric?

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    $\begingroup$ Business reasons. $\endgroup$
    – usεr11852
    Commented Sep 18, 2023 at 23:53
  • $\begingroup$ For what reason do you want to use this metric? What of value to you does it measure? $\endgroup$
    – Dave
    Commented Sep 19, 2023 at 0:05

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