zhengruifeng opened a new pull request #26305: [SPARK-29645][ML][PYSPARK] ML add param RelativeError URL: https://github.com/apache/spark/pull/26305 ### What changes were proposed in this pull request? 1, add shared param `relativeError` 2, `Imputer`/`RobusterScaler`/`QuantileDiscretizer` extend `HasRelativeError` ### Why are the changes needed? It makes sense to expose RelativeError to end users, since it controls both the precision and memory overhead. `QuantileDiscretizer` had already added this param, while other algs not yet. ### Does this PR introduce any user-facing change? yes, new param is added in `Imputer`/`RobusterScaler` ### How was this patch tested? existing testsutes
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