zhengruifeng opened a new pull request #27922: [SPARK-30776][ML][FOLLOWUP] FValue clean up URL: https://github.com/apache/spark/pull/27922 ### What changes were proposed in this pull request? remove unused variables; ### Why are the changes needed? remove unused variables; ### Does this PR introduce any user-facing change? Yes, variable `prev` in `FValueSelectorModel` is no longer exposed ### How was this patch tested? existing testsuites
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