[back port] Copy output data for argsort. (#6866)#6870

Merged

trivialfis merged 1 commit intodmlc:release_1.4.0from trivialfis:backport-auc-fix

Apr 16, 2021

+17-8

Commits on Apr 16, 2021

[back port] Copy output data for argsort. (dmlc#6866 )
trivialfis
committed