[breaking] [jvm-packages] Remove rabit check point. #9599
Merged
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numBoostedRound
to jvm packagesThe last item is a bit more subtle, the change aligns JVM packages with Python packages. After this PR, training continuation counts iteration from 0 instead of from the previous starting iteration. The checkpointing scheme is changed to use boosting versions. I don't understand the previous versioning scheme, likely a legacy inherited from rabit.