[tune] Fix checkpoint sorting with nan values #23909
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Why are these changes needed?
Following #23862, there was an uncaught bug when comparing
nan-priority checkpoints. This is becausefloat("nan") <= float("nan")is alwaysFalse(unlike e.g.np.nan <= np.nan, which isTrue).This PR fixes this bug and adds a new test to ensure correct behavior.
cc @XuehaiPan
Related issue number
Follow-up from #23862
Checks
scripts/format.shto lint the changes in this PR.