Github user feynmanliang commented on the pull request:
https://github.com/apache/spark/pull/8528#issuecomment-136513283
To enable checkpointing you also need to set the `cacheNodeIds` param so
that should be modified as well.
I think we need to have some more discussion about whether this change is
appropriate. I think the rationale for not including in `sharedParams` was to
hide the `expertParam`s. It's also important to note that the semantics behind
decision tree's `setCheckpointInterval` differs from the current usage of
`HasCheckpointInterval` in `ALS` since it depends on `cacheNodeIds`.
CC @jkbradley
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