[backport] Fix using categorical data with the ranker. (#9753)#9778

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trivialfis merged 1 commit intodmlc:release_2.0.0from trivialfis:backport-9753

Nov 8, 2023

+48-3

Commits on Nov 8, 2023

[backport] Fix using categorical data with the ranker. (dmlc#9753 )
trivialfis
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