xgboost
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[dask] Deterministic rank assignment by task key
Alternative to https://github.com/dmlc/xgboost/pull/8018 . Suggested by @jakirkham
@trivialfis Have you decided which of the two alternatives we'd be adopting?
Waiting for others' test results. If this PR works in their environments then I think we will merge this one.
Found some non-deterministic behaviours in this PR, converting it to draft for now.