huaxingao opened a new pull request #26480: [SPARK-29808][ML][PYTHON] StopWordsRemover should support multi-cols URL: https://github.com/apache/spark/pull/26480 ### What changes were proposed in this pull request? Add multi-cols support in StopWordsRemover ### Why are the changes needed? As a basic Transformer, StopWordsRemover should support multi-cols. Param stopWords can be applied across all columns. ### Does this PR introduce any user-facing change? ```StopWordsRemover.setInputCols``` ```StopWordsRemover.setOutputCols``` ### How was this patch tested? Unit tests
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