Jiaming Yuan 5891f752c8 Rework the MAP metric. (#8931) ...

- The new implementation is more strict as only binary labels are accepted. The previous implementation converts values greater than 1 to 1.
- Deterministic GPU. (no atomic add).
- Fix top-k handling.
- Precise definition of MAP. (There are other variants on how to handle top-k).
- Refactor GPU ranking tests.

2023-03-22 17:45:20 +08:00

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