zhengruifeng opened a new pull request #27261: [SPARK-30503][ML] OnlineLDAOptimizer does not handle persistance correctly URL: https://github.com/apache/spark/pull/27261 ### What changes were proposed in this pull request? unpersist graph outside checkpointer, like what Pregel does ### Why are the changes needed? Shown in [SPARK-30503](https://issues.apache.org/jira/browse/SPARK-30503), intermediate edges are not unpersisted ### Does this PR introduce any user-facing change? No ### How was this patch tested? existing testsuites and manual test
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